From 2b9f8d64d7c201a928ab286881d40e62dbc2b9c9 Mon Sep 17 00:00:00 2001
From: Zoe <me@zoeissleeping.xyz>
Date: Sun, 27 Sep 2026 18:44:51 -0500
Subject: [PATCH] bug fixes, and performance improvements, and drawer

---
 TODO.md                                       |    1 +
 app/assets/css/base.css                       |   13 +-
 app/components/ChatInput.vue                  |  249 +-
 app/components/Markdown/Renderer.vue          |   25 +-
 app/components/Markdown/ShikiHighlight.vue    |    4 -
 app/components/Markdown/SourceCitation.vue    |  123 +
 app/components/Message/Agent/Reasoning.vue    |   43 +-
 .../Message/Agent/ReasoningBody.vue           |   65 +
 app/components/Message/Agent/Text.vue         |   11 -
 app/components/Message/Agent/index.vue        |   30 +-
 app/components/Message/index.vue              |  180 +-
 app/components/Sidenav/NavAgent.vue           |   19 +-
 app/components/Tooltip.vue                    |   14 +-
 app/composables/useAgents.ts                  |    9 +-
 app/composables/useAutoScroll.ts              |  120 +-
 app/composables/useChat.ts                    |  213 +-
 app/composables/useTokenDropdown.ts           |    2 -
 app/composables/useTopic.ts                   |   29 +-
 app/composables/useUserEvents.ts              |   45 +-
 app/layouts/default.vue                       |    5 +-
 app/pages/agent/[id]/index.vue                |    9 +-
 app/pages/agent/[id]/topic/[topicId].vue      |  145 +-
 app/pages/index.vue                           |    2 +-
 app/utils/citations.ts                        |   45 +
 app/utils/composer-size.ts                    |   11 +
 app/utils/markdown.ts                         |  153 +-
 app/utils/tool-rendering.ts                   |    6 +-
 .../migration.sql                             |    5 +
 .../snapshot.json                             | 2795 +++++++++++++++++
 drizzle/schema.ts                             |    3 +
 server/api/agents.get.ts                      |   13 +
 .../api/messages/[messageId]/index.delete.ts  |  104 +-
 .../[topicId]/auto-rename/cancel.post.ts      |   73 +-
 .../topic/[topicId]/auto-rename/index.post.ts |  135 +-
 server/api/topic/[topicId]/chat/index.post.ts |   20 +-
 server/api/topic/[topicId]/index.get.ts       |  109 +-
 server/api/topic/[topicId]/index.patch.ts     |    6 +
 server/api/topic/index.post.ts                |    1 +
 server/utils/events.ts                        |   20 +-
 server/utils/live-topic-text.ts               |   65 +
 server/utils/renames.ts                       |   40 +-
 server/utils/search.ts                        |    3 +
 server/utils/topic-snapshot-stream.ts         |   70 +
 tests/citations.test.ts                       |   84 +
 tests/composer-size.test.ts                   |   25 +
 tests/markdown-transform.test.ts              |   52 +
 tests/message-focus.test.ts                   |  190 ++
 tests/topic-rename.test.ts                    |   42 +
 tests/topic-sync.test.ts                      |  131 +
 utils/message.ts                              |  104 +-
 utils/topic-sync.ts                           |   21 +
 utils/topic-title.ts                          |    9 +
 52 files changed, 4913 insertions(+), 778 deletions(-)
 create mode 100644 app/components/Markdown/SourceCitation.vue
 create mode 100644 app/components/Message/Agent/ReasoningBody.vue
 delete mode 100644 app/components/Message/Agent/Text.vue
 create mode 100644 app/utils/citations.ts
 create mode 100644 app/utils/composer-size.ts
 create mode 100644 drizzle/migrations/20260927154018_topic-rename-leases/migration.sql
 create mode 100644 drizzle/migrations/20260927154018_topic-rename-leases/snapshot.json
 create mode 100644 server/utils/live-topic-text.ts
 create mode 100644 server/utils/topic-snapshot-stream.ts
 create mode 100644 tests/citations.test.ts
 create mode 100644 tests/composer-size.test.ts
 create mode 100644 tests/markdown-transform.test.ts
 create mode 100644 tests/message-focus.test.ts
 create mode 100644 tests/topic-rename.test.ts
 create mode 100644 tests/topic-sync.test.ts
 create mode 100644 utils/topic-sync.ts
 create mode 100644 utils/topic-title.ts

diff --git a/TODO.md b/TODO.md
index ca5f120..e92ae4e 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,6 +4,7 @@
 - [x] Make dropdowns a singleton component (work in progress)
 - [ ] Make the sidebar better :kekdoggo:. It's annoying to manage across routes
 - [x] Make topics manually renameable
+- [ ] Surface auto-rename failures through the future toast/error UI; add actionable retry and bounded bulk naming for unnamed/provisional topics
 - [ ] Improve latex rendering, make single line equations work _well_, and likely make it configurable
 - [x] Implement appearence settings
   - [x] Accent colors
diff --git a/app/assets/css/base.css b/app/assets/css/base.css
index 635a643..b68586e 100644
--- a/app/assets/css/base.css
+++ b/app/assets/css/base.css
@@ -318,16 +318,19 @@ button.accent:hover {
     mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='18' height='18'%3E%3Cpath fill='none' stroke='black' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M4 12a1 1 0 1 0 2 0a1 1 0 1 0-2 0m7 0a1 1 0 1 0 2 0a1 1 0 1 0-2 0m7 0a1 1 0 1 0 2 0a1 1 0 1 0-2 0'/%3E%3C/svg%3E");
 }
 
-.reasoning-container.middle {
-    mask-image: linear-gradient(#000, #000, transparent 0, #000 12%, #000 88%, transparent)
+.reasoning-container.top {
+    -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 calc(100% - 24px), transparent 100%);
+    mask-image: linear-gradient(to bottom, #000 0%, #000 calc(100% - 24px), transparent 100%);
 }
 
-.reasoning-container.top {
-    mask-image: linear-gradient(#000, transparent, #000 0, #000 12%, #000 88%, transparent)
+.reasoning-container.middle {
+    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 24px, #000 calc(100% - 24px), transparent 100%);
+    mask-image: linear-gradient(to bottom, transparent 0%, #000 24px, #000 calc(100% - 24px), transparent 100%);
 }
 
 .reasoning-container.bottom {
-    mask-image: linear-gradient(transparent, #000, transparent 0, #000 12%, #000 88%, #000)
+    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 24px, #000 100%);
+    mask-image: linear-gradient(to bottom, transparent 0%, #000 24px, #000 100%);
 }
 
 /* Markdown renderer */
diff --git a/app/components/ChatInput.vue b/app/components/ChatInput.vue
index bdee850..ed8c0c1 100644
--- a/app/components/ChatInput.vue
+++ b/app/components/ChatInput.vue
@@ -4,11 +4,17 @@ import { computed, onMounted, ref, watch, onUnmounted, nextTick, type Ref } from
 import type { ModelWithProvider, ProviderWithModels } from '~/composables/useModels';
 import type { Agent } from '~/composables/useAgents';
 import type FileSelector from './FileSelector.vue';
+import { getComposerHeight } from '~/utils/composer-size';
 
 const { allModels } = await useModels();
 const { updateAgent, patchAgentLocally } = await useAgents();
 
-const inputHeight: Ref<string> = ref('auto');
+const isDrawerOpen = useCookie<boolean>("chat:tools-drawer", { default: () => false });
+watch(isDrawerOpen, () => {
+    emit("resize");
+});
+
+const inputHeight: Ref<string> = ref('48px');
 const fileSelectorRef = ref<InstanceType<typeof FileSelector> | null>(null);
 const inputRef = ref<HTMLTextAreaElement | null>(null);
 let tempInput = '';
@@ -303,47 +309,57 @@ const handleWindowKeyDown = async (event: KeyboardEvent) => {
 };
 
 const mirrorRef = ref<HTMLDivElement | null>(null);
+const MIRROR_PROPERTIES = [
+    'box-sizing', 'font-family', 'font-size', 'font-weight', 'font-style',
+    'line-height', 'letter-spacing', 'word-spacing', 'text-align', 'text-indent',
+    'text-transform', 'tab-size', 'padding-top', 'padding-bottom', 'padding-left',
+    'padding-right', 'border-top-width', 'border-bottom-width', 'border-left-width',
+    'border-right-width', 'border-style', 'white-space', 'overflow-wrap', 'word-break',
+] as const;
+let sizingRaf: number | undefined;
+let sizingObserver: ResizeObserver | undefined;
+let typographyObserver: MutationObserver | undefined;
+let sizingDirty = true;
+let mirrorWidth = '';
+let lineHeight = 24;
+let padding = 0;
+let borders = 0;
+let borderBox = true;
 
 const resizeTextArea = () => {
-    const textarea = inputRef.value;
-    const mirror = mirrorRef.value;
-    if (!textarea || !mirror) return;
+    if (import.meta.server || sizingRaf !== undefined) return;
+    sizingRaf = requestAnimationFrame(() => {
+        sizingRaf = undefined;
+        const textarea = inputRef.value;
+        const mirror = mirrorRef.value;
+        if (!textarea || !mirror) return;
 
-    emit('resize');
-    nextTick().then(() => {
-        mirror.textContent = (textarea.value || '\u200b') + '\n';
+        if (sizingDirty) {
+            // Finish style reads before changing the isolated measurement box.
+            const styles = getComputedStyle(textarea);
+            const values = MIRROR_PROPERTIES.map(property => styles.getPropertyValue(property));
+            mirrorWidth = styles.width;
+            lineHeight = Number.parseFloat(styles.lineHeight) || Number.parseFloat(styles.fontSize) * 1.2;
+            padding = Number.parseFloat(styles.paddingTop) + Number.parseFloat(styles.paddingBottom);
+            borders = Number.parseFloat(styles.borderTopWidth) + Number.parseFloat(styles.borderBottomWidth);
+            borderBox = styles.boxSizing === 'border-box';
+            MIRROR_PROPERTIES.forEach((property, index) => mirror.style.setProperty(property, values[index]!));
+            mirror.style.width = mirrorWidth;
+            sizingDirty = false;
+        }
 
-        const textareaStyles = getComputedStyle(textarea);
-        mirror.style.width = textareaStyles.width;
-        mirror.style.fontFamily = textareaStyles.fontFamily;
-        mirror.style.fontSize = textareaStyles.fontSize;
-        mirror.style.lineHeight = textareaStyles.lineHeight;
-        mirror.style.letterSpacing = textareaStyles.letterSpacing;
-        mirror.style.wordSpacing = textareaStyles.wordSpacing;
-        mirror.style.textAlign = textareaStyles.textAlign;
-        mirror.style.paddingTop = textareaStyles.paddingTop;
-        mirror.style.paddingBottom = textareaStyles.paddingBottom;
-        mirror.style.paddingLeft = textareaStyles.paddingLeft;
-        mirror.style.paddingRight = textareaStyles.paddingRight;
-        mirror.style.borderTopWidth = textareaStyles.borderTopWidth;
-        mirror.style.borderBottomWidth = textareaStyles.borderBottomWidth;
-        mirror.style.borderLeftWidth = textareaStyles.borderLeftWidth;
-        mirror.style.borderRightWidth = textareaStyles.borderRightWidth;
-        mirror.style.whiteSpace = 'pre-wrap';
-        mirror.style.wordWrap = 'break-word';
-        mirror.style.overflow = 'hidden';
+        // Preserve the final empty line without adding an extra line to ordinary text.
+        mirror.textContent = textarea.value + '\u200b';
+        const height = `${getComposerHeight(mirror.scrollHeight, lineHeight, padding, borders, borderBox)}px`;
+        if (height === inputHeight.value) return;
 
-        const lineHeight = 24;
-        const minLines = 2;
-        const maxLines = 10;
-        const minHeight = minLines * lineHeight;
-        const maxHeight = maxLines * lineHeight;
-        const height = Math.min(Math.max(mirror.scrollHeight, minHeight), maxHeight);
-        inputHeight.value = `${height}px`;
+        // Capture bottom-follow intent before applying the new height.
+        emit('resize');
+        inputHeight.value = height;
     });
 };
 
-watch(textAreaValue, resizeTextArea, { immediate: true });
+watch(textAreaValue, resizeTextArea, { flush: 'post' });
 
 let hasCommandKey = false;
 if (import.meta.server) {
@@ -357,41 +373,51 @@ onBeforeMount(() => {
     tempInput = (document.getElementById('chat') as HTMLInputElement)?.value ?? '';
 });
 
-let resizeRafId: number | undefined;
 const handleWindowResize = () => {
-    if (resizeRafId) return;
-    resizeRafId = requestAnimationFrame(() => {
-        resizeRafId = undefined;
-        resizeTextArea();
-    });
-}
+    sizingDirty = true;
+    resizeTextArea();
+};
 
 onMounted(() => {
     textAreaValue.value = tempInput;
     document.addEventListener('keydown', handleWindowKeyDown);
     window.addEventListener('resize', handleWindowResize);
     inputRef.value?.addEventListener('paste', handlePaste);
+    let observedWidth: number | undefined;
+    sizingObserver = new ResizeObserver(([entry]) => {
+        if (!entry || entry.contentRect.width === observedWidth) return;
+        observedWidth = entry.contentRect.width;
+        handleWindowResize();
+    });
+    if (inputRef.value) sizingObserver.observe(inputRef.value);
+    typographyObserver = new MutationObserver(handleWindowResize);
+    typographyObserver.observe(document.documentElement, { attributes: true, attributeFilter: ['class', 'style'] });
+    document.fonts.addEventListener('loadingdone', handleWindowResize);
+    handleWindowResize();
 });
 
 onUnmounted(() => {
     document.removeEventListener('keydown', handleWindowKeyDown);
     window.removeEventListener('resize', handleWindowResize);
-    if (resizeRafId !== undefined) cancelAnimationFrame(resizeRafId);
+    if (sizingRaf !== undefined) cancelAnimationFrame(sizingRaf);
+    sizingObserver?.disconnect();
+    typographyObserver?.disconnect();
+    document.fonts.removeEventListener('loadingdone', handleWindowResize);
     inputRef.value?.removeEventListener('paste', handlePaste);
 });
 </script>
 
 <template>
-    <div :class="['w-full flex max-h-full', $attrs.class]">
-        <div ref="mirrorRef" aria-hidden="true"
-            class="absolute top-0 left-0 pointer-events-none invisible overflow-hidden h-0"></div>
-        <div class="relative w-full flex flex-shrink-1 flex-col gap-3 p-2 rounded-2xl border transition-border ease-in-out duration-300 bg-[var(--bg-container)]
+    <div :class="['w-full flex flex-col max-h-full', $attrs.class]">
+        <div ref="mirrorRef" data-chat-measurement aria-hidden="true"
+            class="fixed top-0 left-0 pointer-events-none invisible overflow-hidden h-0 [contain:layout_style_paint]"></div>
+        <div class="relative z-10 w-full flex flex-shrink-1 flex-col gap-3 p-2 rounded-2xl border transition-border ease-in-out duration-300 bg-[var(--bg-container)]
         border-[var(--color-border)] focus-within:border-[var(--color-border-active)]">
             <div v-if="files.length > 0"
                 class="flex-shrink-0 flex flex-nowrap gap-2 pt-2 px-2 pb-1 overflow-x-auto overflow-y-hidden [scrollbar-width:thin]">
                 <!-- TODO: show attachment previews -->
                 <AttachmentPreview v-for="file in files" @delete="files = files.filter((f) => f.id !== file.id)"
-                    @retry="fileSelectorRef?.retryFile(file.id)" :key="file.id" :file="file" />
+                    @retry="fileSelectorRef?.retryFile(file.id)" :key="file.id" :file="file"></AttachmentPreview>
             </div>
             <div class="min-w-0 max-h-full">
                 <!-- Grammarly literally breaks everything, go fuck yourself -->
@@ -404,20 +430,76 @@ onUnmounted(() => {
 
             <div class="flex items-center justify-between gap-2">
                 <!-- TODO: since we dont want to model selector dropdown to potentially overflow, it has max-width: 100%, so, we need to maake the trigger large enough to fit the entire width of the dropdown -->
-                <div class="flex flex-1 gap-1 min-w-0">
+                <div class="flex flex-1 items-center gap-1 min-w-0">
+                    <button v-if="selectedModel?.capabilities.includes('tools')"
+                        type="button"
+                        @click="isDrawerOpen = !isDrawerOpen"
+                        class="sm:hidden relative flex items-center justify-center h-8.5 w-8.5 shrink-0 @hover:bg-[var(--color-hover)] rounded-lg transition-colors duration-200"
+                        :aria-label="isDrawerOpen ? 'Close tools drawer' : 'Open tools drawer'"
+                        :aria-expanded="isDrawerOpen">
+                        <span class="i-mynaui-chevron-down text-5 text-[var(--text-secondary)] transition-transform duration-200"
+                            :class="{ 'rotate-180': isDrawerOpen }"></span>
+                        <span v-if="!isDrawerOpen && (searchConfig.enabled || toolsConfig.python)"
+                            class="absolute top-1.5 right-1.5 w-2 h-2 rounded-full bg-[var(--color-accent)]"></span>
+                    </button>
                     <ModelSelector v-if="providers !== undefined" :add-hotkey="true" v-model="selectedModel"
-                        :providers="providers" />
-                    <SearchSelector v-if="selectedModel?.capabilities.includes('tools')" :enabled="searchConfig.enabled"
-                        @update:enabled="(v: boolean) => { searchConfig.enabled = v; saveSearchConfig() }" />
-                    <ToolSelector v-if="selectedModel?.capabilities.includes('tools')" :python="toolsConfig.python"
-                        @update:python="(v: boolean) => { toolsConfig.python = v; saveToolsConfig() }" />
-                    <FileSelector ref="fileSelectorRef" :selected-model="selectedModel" v-model="files" />
+                        :providers="providers"></ModelSelector>
+                    <div v-if="selectedModel?.capabilities.includes('tools')" class="hidden sm:flex items-center gap-1">
+                        <SearchSelector :enabled="searchConfig.enabled"
+                            @update:enabled="(v: boolean) => { searchConfig.enabled = v; saveSearchConfig(); }"></SearchSelector>
+                        <ToolSelector :python="toolsConfig.python"
+                            @update:python="(v: boolean) => { toolsConfig.python = v; saveToolsConfig(); }"></ToolSelector>
+                    </div>
                 </div>
-                <div v-if="allowManualRole" class="flex items-center">
-                    <button aria-label="Send message" @click="handleSubmit"
+                <div class="flex items-center gap-1 shrink-0">
+                    <FileSelector ref="fileSelectorRef" :selected-model="selectedModel" v-model="files"></FileSelector>
+                    <div v-if="allowManualRole" class="flex items-center">
+                        <button aria-label="Send message" @click="handleSubmit"
+                            :disabled="((!inputValue.content.trim() && files.length === 0) && !loading) || isUploading || hasFailedUploads"
+                            :class="[
+                                'h-8 w-8 rounded-l-lg rounded-r-none transition-all duration-200 flex items-center justify-center disabled:cursor-not-allowed disabled:bg-transparent',
+                                (inputValue.content.trim() || files.length > 0) && !loading && !isUploading && !hasFailedUploads
+                                    ? 'bg-[var(--color-accent)] text-[var(--color-accent-text)] @hover:bg-[var(--color-accent-hover)]'
+                                    : 'text-[var(--text-dim)]',
+                                loading && 'bg-[var(--color-hover)] @hover:bg-[var(--color-active)]',
+                            ]">
+                            <span v-if="loading" class="text-6.5 i-mynaui-stop-solid"></span>
+                            <span v-else class="text-5 i-mynaui-send-solid"></span>
+                        </button>
+                        <Dropdown placement="bottom-end">
+                            <template #default="{ setRef, isOpen, toggle }">
+                                <button :ref="setRef" aria-label="Message options" @click="toggle"
+                                    :disabled="(!inputValue.content.trim() && files.length === 0) || loading || isUploading || hasFailedUploads"
+                                    :class="[
+                                        'h-8 w-6 rounded-r-lg rounded-l-none transition-all duration-200 flex items-center justify-center disabled:cursor-not-allowed border-l border-[var(--text-dim)] disabled:border-transparent',
+                                        (inputValue.content.trim() || files.length > 0) && !loading && !isUploading && !hasFailedUploads
+                                            ? 'bg-[var(--color-accent)] text-[var(--color-accent-text)] @hover:bg-[var(--color-accent-hover)] disabled:bg-transparent'
+                                            : 'text-[var(--text-dim)]',
+                                        loading && 'bg-[var(--color-hover)] @hover:bg-[var(--color-active)]',
+                                    ]">
+                                    <span class="text-4.5 i-mynaui-chevron-down" :class="{ 'rotate-180': isOpen }"></span>
+                                </button>
+                            </template>
+                            <template #dropdown="{ close }">
+                                <button
+                                    class="flex items-center gap-2 px-3 py-1.5 rounded-lg text-sm text-[var(--text-primary)] @hover:bg-[var(--color-hover)] transition-colors whitespace-nowrap"
+                                    @click="handleAddMessage('user'); close()">
+                                    <span class="text-4 i-mynaui-user"></span>
+                                    Add as User
+                                </button>
+                                <button
+                                    class="flex items-center gap-2 px-3 py-1.5 rounded-lg text-sm text-[var(--text-primary)] @hover:bg-[var(--color-hover)] transition-colors whitespace-nowrap"
+                                    @click="handleAddMessage('assistant'); close()">
+                                    <span class="text-4 i-mynaui-sparkles"></span>
+                                    Add as Assistant
+                                </button>
+                            </template>
+                        </Dropdown>
+                    </div>
+                    <button v-else aria-label="Send message" @click="handleSubmit"
                         :disabled="((!inputValue.content.trim() && files.length === 0) && !loading) || isUploading || hasFailedUploads"
                         :class="[
-                            'h-8 w-8 rounded-l-lg rounded-r-none transition-all duration-200 flex items-center justify-center disabled:cursor-not-allowed disabled:bg-transparent',
+                            'h-8 w-8 rounded-xl transition-all duration-200 flex items-center justify-center disabled:cursor-not-allowed disabled:bg-transparent',
                             (inputValue.content.trim() || files.length > 0) && !loading && !isUploading && !hasFailedUploads
                                 ? 'bg-[var(--color-accent)] text-[var(--color-accent-text)] @hover:bg-[var(--color-accent-hover)]'
                                 : 'text-[var(--text-dim)]',
@@ -426,48 +508,19 @@ onUnmounted(() => {
                         <span v-if="loading" class="text-6.5 i-mynaui-stop-solid"></span>
                         <span v-else class="text-5 i-mynaui-send-solid"></span>
                     </button>
-                    <Dropdown placement="bottom-end">
-                        <template #default="{ setRef, isOpen, toggle }">
-                            <button :ref="setRef" aria-label="Message options" @click="toggle"
-                                :disabled="(!inputValue.content.trim() && files.length === 0) || loading || isUploading || hasFailedUploads"
-                                :class="[
-                                    'h-8 w-6 rounded-r-lg rounded-l-none transition-all duration-200 flex items-center justify-center disabled:cursor-not-allowed border-l border-[var(--text-dim)] disabled:border-transparent',
-                                    (inputValue.content.trim() || files.length > 0) && !loading && !isUploading && !hasFailedUploads
-                                        ? 'bg-[var(--color-accent)] text-[var(--color-accent-text)] @hover:bg-[var(--color-accent-hover)] disabled:bg-transparent'
-                                        : 'text-[var(--text-dim)]',
-                                    loading && 'bg-[var(--color-hover)] @hover:bg-[var(--color-active)]',
-                                ]">
-                                <span class="text-4.5 i-mynaui-chevron-down" :class="{ 'rotate-180': isOpen }"></span>
-                            </button>
-                        </template>
-                        <template #dropdown="{ close }">
-                            <button
-                                class="flex items-center gap-2 px-3 py-1.5 rounded-lg text-sm text-[var(--text-primary)] @hover:bg-[var(--color-hover)] transition-colors whitespace-nowrap"
-                                @click="handleAddMessage('user'); close()">
-                                <span class="text-4 i-mynaui-user"></span>
-                                Add as User
-                            </button>
-                            <button
-                                class="flex items-center gap-2 px-3 py-1.5 rounded-lg text-sm text-[var(--text-primary)] @hover:bg-[var(--color-hover)] transition-colors whitespace-nowrap"
-                                @click="handleAddMessage('assistant'); close()">
-                                <span class="text-4 i-mynaui-sparkles"></span>
-                                Add as Assistant
-                            </button>
-                        </template>
-                    </Dropdown>
                 </div>
-                <button v-else aria-label="Send message" @click="handleSubmit"
-                    :disabled="((!inputValue.content.trim() && files.length === 0) && !loading) || isUploading || hasFailedUploads"
-                    :class="[
-                        'h-8 w-8 rounded-xl transition-all duration-200 flex items-center justify-center disabled:cursor-not-allowed disabled:bg-transparent',
-                        (inputValue.content.trim() || files.length > 0) && !loading && !isUploading && !hasFailedUploads
-                            ? 'bg-[var(--color-accent)] text-[var(--color-accent-text)] @hover:bg-[var(--color-accent-hover)]'
-                            : 'text-[var(--text-dim)]',
-                        loading && 'bg-[var(--color-hover)] @hover:bg-[var(--color-active)]',
-                    ]">
-                    <span v-if="loading" class="text-6.5 i-mynaui-stop-solid"></span>
-                    <span v-else class="text-5 i-mynaui-send-solid"></span>
-                </button>
+            </div>
+        </div>
+
+        <div v-if="selectedModel?.capabilities.includes('tools')"
+            class="sm:hidden relative z-0 mx-auto w-[calc(100%-4px)] transition-[height] duration-250 ease-[cubic-bezier(0.4,_0,_0.2,_1)]"
+            :class="isDrawerOpen ? 'h-[44px]' : 'h-0'">
+            <div class="absolute -top-4 left-0 right-0 pt-5 px-3 pb-1.5 rounded-b-2xl border-x border-b border-[var(--color-border)] bg-[var(--bg-surface)] flex items-center gap-1.5 transition-[transform,opacity] duration-250 ease-[cubic-bezier(0.4,_0,_0.2,_1)]"
+                :class="isDrawerOpen ? 'translate-y-0 opacity-100' : '-translate-y-[44px] opacity-0 pointer-events-none'">
+                <SearchSelector :enabled="searchConfig.enabled"
+                    @update:enabled="(v: boolean) => { searchConfig.enabled = v; saveSearchConfig(); }"></SearchSelector>
+                <ToolSelector :python="toolsConfig.python"
+                    @update:python="(v: boolean) => { toolsConfig.python = v; saveToolsConfig(); }"></ToolSelector>
             </div>
         </div>
     </div>
diff --git a/app/components/Markdown/Renderer.vue b/app/components/Markdown/Renderer.vue
index c31c773..8e6a17c 100644
--- a/app/components/Markdown/Renderer.vue
+++ b/app/components/Markdown/Renderer.vue
@@ -1,7 +1,9 @@
 <script setup lang="ts">
-import type { MarkdownAstNode, MarkdownElementNode } from '~/utils/markdown';
-import { createMarkdownParser, getNodeAttributes, getNodeChildren, getNodeTag, splitParagraphBreaks, textContent, toVueAttributes } from '~/utils/markdown';
-import { createTextVNode, h, ref, watch } from 'vue';
+import type { MarkdownAstNode } from '~/utils/markdown';
+import { agentParser, userParser, getNodeAttributes, getNodeChildren, getNodeTag, splitParagraphBreaks, textContent, toVueAttributes } from '~/utils/markdown';
+import { createTextVNode, h, shallowRef, watch } from 'vue';
+import type { SearchSource } from '~/utils/tool-rendering';
+import SourceCitation from './SourceCitation.vue';
 import MarkdownMath from './Math.vue';
 import MarkdownShikiHighlight from './ShikiHighlight.vue';
 
@@ -9,15 +11,19 @@ const props = defineProps<{
     content: string;
     finished: boolean;
     id: string;
+    sources?: ReadonlyMap<string, SearchSource>;
+    citations?: boolean;
 }>();
 
-const parser = createMarkdownParser();
+const parser = props.citations ? agentParser : userParser;
 const parse = async (content: string, finished: boolean) => {
     const tree = await parser(content, { streaming: !finished });
+    // Copy-on-write: br-free trees return by reference with no allocation.
     return splitParagraphBreaks(tree);
 };
 
-const parsed = ref(await parse(props.content, props.finished));
+// Parsed trees are replaced, never mutated. Avoid proxying every AST node.
+const parsed = shallowRef(await parse(props.content, props.finished));
 let parseVersion = 0;
 
 watch(
@@ -46,6 +52,11 @@ const renderNode = (node: MarkdownAstNode, path: string): any => {
 
     const tag = getNodeTag(node);
     const attributes = getNodeAttributes(node);
+    if (tag === 'source-cite') {
+        const ids = typeof attributes.ids === "string" ? attributes.ids.split(",") : [];
+        return h(SourceCitation, { key: path, ids, sources: props.sources });
+    }
+
     if (tag === 'pre') {
         const language = typeof attributes.language === 'string' ? attributes.language : 'text';
         return h(MarkdownShikiHighlight, {
@@ -79,9 +90,7 @@ const render = () => {
         .map((node, index) => renderNode(node, `${props.id}.${index}`))
         .filter((child) => child !== null);
 
-    return h('div', { class: 'prose-wrapper' }, [
-        h('article', { class: 'markdown-body' }, children),
-    ]);
+    return h('article', { class: 'prose-wrapper markdown-body' }, children);
 };
 </script>
 
diff --git a/app/components/Markdown/ShikiHighlight.vue b/app/components/Markdown/ShikiHighlight.vue
index 0e80170..8398b0b 100644
--- a/app/components/Markdown/ShikiHighlight.vue
+++ b/app/components/Markdown/ShikiHighlight.vue
@@ -3,8 +3,6 @@ import { type Grammar } from 'shiki';
 import { hashSync } from '~/utils/hash';
 const props = defineProps<{ code: string; language: string }>();
 
-const start = Date.now();
-
 const MAX_LENGTH = 15000;
 
 const renderId = `${useId()}-${hashSync(props.code + props.language)}`;
@@ -76,8 +74,6 @@ onUnmounted(() => {
     if (copyTimeout) clearTimeout(copyTimeout);
     clear();
 });
-
-console.log("shiki codeblock rendered in", Date.now() - start);
 </script>
 
 <template>
diff --git a/app/components/Markdown/SourceCitation.vue b/app/components/Markdown/SourceCitation.vue
new file mode 100644
index 0000000..b5c6523
--- /dev/null
+++ b/app/components/Markdown/SourceCitation.vue
@@ -0,0 +1,123 @@
+<script setup lang="ts">
+import type { SearchSource } from "~/utils/tool-rendering";
+import { autoUpdate, flip, offset, shift, useFloating } from "@floating-ui/vue";
+import { computed, onBeforeUnmount, ref, useId } from "vue";
+import { getFaviconUrl } from "~/utils/tool-rendering";
+
+const props = defineProps<{
+    ids: string[];
+    sources?: ReadonlyMap<string, SearchSource>;
+}>();
+
+const entries = computed(() => [...new Set(props.ids)].map(id => ({ id, source: props.sources?.get(id) })));
+const firstSource = computed(() => entries.value.find(entry => entry.source)?.source);
+const label = computed(() => {
+    const first = firstSource.value?.hostname ?? "Source unavailable";
+    return entries.value.length > 1 ? `${first} +${entries.value.length - 1}` : first;
+});
+const popupId = useId();
+const trigger = ref<HTMLElement | null>(null);
+const preview = ref<HTMLElement | null>(null);
+const open = ref(false);
+const failedFavicons = ref(new Set<string>());
+const { floatingStyles, placement } = useFloating(trigger, preview, {
+    open,
+    strategy: "fixed",
+    placement: "top-start",
+    middleware: [offset(8), flip(), shift({ padding: 12 })],
+    whileElementsMounted: autoUpdate,
+    transform: false,
+});
+
+const transformOrigin = computed(() =>
+    placement.value.startsWith("top")
+        ? "transform-origin-bottom-center"
+        : "transform-origin-top-center"
+);
+
+let closeTimer: ReturnType<typeof setTimeout> | undefined;
+let pointerInside = false;
+
+const cancelClose = () => {
+    clearTimeout(closeTimer);
+    closeTimer = undefined;
+};
+
+const showPreview = () => {
+    cancelClose();
+    open.value = true;
+};
+
+const scheduleClose = () => {
+    cancelClose();
+    // Allow the pointer to cross the gap between the badge and the preview.
+    closeTimer = setTimeout(() => {
+        closeTimer = undefined;
+        const focused = document.activeElement;
+        if (!pointerInside && !trigger.value?.contains(focused) && !preview.value?.contains(focused)) {
+            open.value = false;
+        }
+    }, 150);
+};
+
+const onPointerEnter = (event: PointerEvent) => {
+    if (event.pointerType === "touch") {
+        return;
+    }
+    pointerInside = true;
+    showPreview();
+};
+
+const onPointerLeave = (event: PointerEvent) => {
+    if (event.pointerType === "touch") {
+        return;
+    }
+    pointerInside = false;
+    scheduleClose();
+};
+
+const dismissPreview = () => {
+    cancelClose();
+    if (preview.value?.contains(document.activeElement)) {
+        trigger.value?.focus();
+    }
+    open.value = false;
+};
+
+onBeforeUnmount(cancelClose);
+</script>
+
+<template>
+    <a ref="trigger" :href="firstSource?.url" target="_blank" rel="noopener noreferrer"
+        :tabindex="firstSource ? undefined : 0" :aria-expanded="open" :aria-controls="open ? popupId : undefined"
+        @pointerenter="onPointerEnter" @pointerleave="onPointerLeave" @focusin="showPreview" @focusout="scheduleClose"
+        @keydown.esc.stop.prevent="dismissPreview"
+        class="inline-flex items-center gap-1 max-w-64 mx-1 px-2 border border-[var(--color-border)] rounded-full bg-[var(--bg-container)] hover:bg-[var(--color-hover)] transition-colors text-[var(--text-secondary)] text-xs align-baseline cursor-pointer focus-visible:outline-solid focus-visible:outline-2 focus-visible:outline-[var(--text-secondary)] focus-visible:outline-offset-2 decoration-none">
+        <img v-if="firstSource && !failedFavicons.has(firstSource.hostname)" :src="getFaviconUrl(firstSource.hostname)"
+            alt="" loading="lazy" class="rounded-[4px] w-[0.9rem] h-[0.9rem] m-0"
+            @error="failedFavicons.add(firstSource.hostname)">
+        {{ label }}
+    </a>
+    <Transition enter-active-class="transition-[opacity,transform] duration-150 ease-[cubic-bezier(0.5,_1,_0.89,_1)]"
+        enter-from-class="opacity-0 scale-95 translate-y-1" enter-to-class="opacity-100 scale-100 translate-y-0"
+        leave-active-class="transition-[opacity,transform] duration-100 ease-[cubic-bezier(0.5,_1,_0.89,_1)]"
+        leave-from-class="opacity-100 scale-100 translate-y-0" leave-to-class="opacity-0 scale-95 translate-y-1">
+        <span v-if="open" :id="popupId" ref="preview" @pointerenter="onPointerEnter" @pointerleave="onPointerLeave"
+            @focusin="showPreview" @focusout="scheduleClose" @keydown.esc.stop.prevent="dismissPreview"
+            class="z-2 inset-auto m-0 p-[0.85rem] w-[min(22rem,calc(100vw_-_24px))] max-h-[min(24rem,70vh)] overflow-y-auto border border-[var(--color-border)] rounded-xl bg-[var(--bg-surface)] text-[var(--text-primary)] shadow-md text-sm leading-normal"
+            :class="transformOrigin" :style="floatingStyles">
+            <span v-for="(entry, index) in entries" :key="entry.id"
+                class="flex flex-col gap-[0.4rem] [overflow-wrap:anywhere]"
+                :class="{ 'mt-[0.8rem] pt-[0.8rem] border-t border-[var(--color-border)]': index > 0 }">
+                <template v-if="entry.source">
+                    <span class="text-xs text-[var(--text-secondary)]">{{ entry.source.hostname }} · Search
+                        excerpt</span>
+                    <a :href="entry.source.url" target="_blank" rel="noopener noreferrer">{{ entry.source.title }}</a>
+                    <span v-if="entry.source.snippet" class="whitespace-pre-wrap text-[var(--text-secondary)]">{{
+                        entry.source.snippet }}</span>
+                </template>
+                <span v-else>Source unavailable ({{ entry.id }})</span>
+            </span>
+        </span>
+    </Transition>
+</template>
diff --git a/app/components/Message/Agent/Reasoning.vue b/app/components/Message/Agent/Reasoning.vue
index 075493b..556652f 100644
--- a/app/components/Message/Agent/Reasoning.vue
+++ b/app/components/Message/Agent/Reasoning.vue
@@ -1,11 +1,13 @@
 <script setup lang="ts">
 import type { MessagePart } from '~/composables/useChat';
+import ReasoningBody from './ReasoningBody.vue';
 
 const props = defineProps<{
     part: Readonly<MessagePart>;
 }>();
 
 const reasoningOpen = ref(!props.part.finished);
+const bodyRef = ref<InstanceType<typeof ReasoningBody> | null>(null);
 
 watch(
     () => props.part.finished,
@@ -14,44 +16,14 @@ watch(
     },
 );
 
-const containerRef: Ref<HTMLDivElement | null> = ref(null);
-const scrollState = ref('middle');
-
-const { scrollToBottom } = useAutoScroll(containerRef);
-
-const handleScroll = () => {
-    if (!containerRef.value) return;
-
-    const container = containerRef.value;
-    const scrollTop = container.scrollTop;
-    const scrollHeight = container.scrollHeight;
-    const clientHeight = container.clientHeight;
-
-    const topThreshold = 0.02 * clientHeight;
-
-    if (scrollHeight <= clientHeight) {
-        // the container does not have enough content to scroll
-        scrollState.value = '';
-        return;
-    }
-
-    if (scrollTop <= topThreshold) {
-        scrollState.value = 'top';
-    } else if (scrollTop + 100 >= scrollHeight - clientHeight) {
-        scrollState.value = 'bottom';
-    } else {
-        scrollState.value = 'middle';
-    }
-};
-
 const toggleReasoning = async () => {
     if (!props.part.finished) return;
 
     reasoningOpen.value = !reasoningOpen.value;
     if (!reasoningOpen.value) return;
     await nextTick();
-    scrollToBottom('instant');
-    handleScroll();
+    bodyRef.value?.scrollToBottom('instant');
+    bodyRef.value?.handleScroll();
 };
 
 const formatDuration = (ms: number) => {
@@ -91,11 +63,6 @@ const formatDuration = (ms: number) => {
             <span class="i-mynaui-chevron-down w-4 h-4 text-[var(--text-secondary)]"
                 :class="reasoningOpen ? '' : '-rotate-90'"></span>
         </button>
-        <div v-if="reasoningOpen" ref="containerRef" @scroll="handleScroll"
-            :class="['reasoning-container max-h-[min(40vh,320px)] overflow-y-auto [scrollbar-width:thin] [scrollbar-color:#888_transparent] [scrollbar-gutter:stable]', scrollState]">
-            <div class="p-2">
-                <MarkdownRenderer :finished="part.finished" :id="part.id" :content="part.content!" />
-            </div>
-        </div>
+        <ReasoningBody v-if="reasoningOpen" ref="bodyRef" :part="part" />
     </div>
 </template>
diff --git a/app/components/Message/Agent/ReasoningBody.vue b/app/components/Message/Agent/ReasoningBody.vue
new file mode 100644
index 0000000..cac4609
--- /dev/null
+++ b/app/components/Message/Agent/ReasoningBody.vue
@@ -0,0 +1,65 @@
+<script setup lang="ts">
+import type { MessagePart } from '~/composables/useChat';
+import { nextTick, onMounted, ref, watch, type Ref } from 'vue';
+
+const props = defineProps<{
+    part: Readonly<MessagePart>;
+}>();
+
+const containerRef: Ref<HTMLDivElement | null> = ref(null);
+const scrollState = ref('');
+
+const { scrollToBottom } = useAutoScroll(containerRef);
+
+const handleScroll = () => {
+    if (!containerRef.value) {
+        return;
+    }
+
+    const container = containerRef.value;
+    const scrollTop = container.scrollTop;
+    const scrollHeight = container.scrollHeight;
+    const clientHeight = container.clientHeight;
+
+    if (scrollHeight <= clientHeight) {
+        scrollState.value = '';
+        return;
+    }
+
+    const threshold = Math.max(6, 0.02 * clientHeight);
+
+    if (scrollTop <= threshold) {
+        scrollState.value = 'top';
+    } else if (scrollTop >= scrollHeight - clientHeight - threshold) {
+        scrollState.value = 'bottom';
+    } else {
+        scrollState.value = 'middle';
+    }
+};
+
+onMounted(() => {
+    nextTick(() => {
+        handleScroll();
+    });
+});
+
+watch(
+    () => props.part.content,
+    () => {
+        nextTick(() => {
+            handleScroll();
+        });
+    },
+);
+
+defineExpose({ scrollToBottom, handleScroll });
+</script>
+
+<template>
+    <div ref="containerRef" @scroll="handleScroll"
+        :class="['reasoning-container max-h-[min(40vh,320px)] overflow-y-auto [scrollbar-width:thin] [scrollbar-color:#888_transparent] [scrollbar-gutter:stable]', scrollState]">
+        <div class="p-2">
+            <MarkdownRenderer :finished="props.part.finished" :id="props.part.id" :content="props.part.content!" />
+        </div>
+    </div>
+</template>
diff --git a/app/components/Message/Agent/Text.vue b/app/components/Message/Agent/Text.vue
deleted file mode 100644
index 11d3c6f..0000000
--- a/app/components/Message/Agent/Text.vue
+++ /dev/null
@@ -1,11 +0,0 @@
-<script lang="ts" setup>
-import type { MessagePart } from '~/composables/useChat';
-
-const props = defineProps<{
-    part: Readonly<MessagePart>;
-}>();
-</script>
-
-<template>
-    <MarkdownRenderer :finished="part.finished" :id="part.id" :content="part.content!" />
-</template>
diff --git a/app/components/Message/Agent/index.vue b/app/components/Message/Agent/index.vue
index b2351db..714152f 100644
--- a/app/components/Message/Agent/index.vue
+++ b/app/components/Message/Agent/index.vue
@@ -1,7 +1,8 @@
 <script setup lang="ts">
+import { collectCitationSources } from '~/utils/citations';
+import type { SearchSource } from '~/utils/tool-rendering';
 import Error from './Error.vue';
 import Reasoning from './Reasoning.vue';
-import Text from './Text.vue';
 import Tool from './Tool/index.vue';
 import type { MessageEntity } from '~/composables/useChat';
 
@@ -9,6 +10,14 @@ const props = defineProps<{
     message: MessageEntity
 }>();
 
+const EMPTY_SOURCES: ReadonlyMap<string, SearchSource> = new Map();
+
+// Citation markers are rare; avoid JSON-parsing every tool output when none exist.
+const sources = computed(() => {
+    const parts = props.message.parts ?? [];
+    const hasCitations = parts.some(part => part.type === 'text' && part.content?.includes('[[cite:') === true);
+    return hasCitations ? collectCitationSources(parts) : EMPTY_SOURCES;
+});
 const triggerRef = ref<HTMLElement | null>(null);
 
 const { open, close, isOpen } = useTokenDropdown();
@@ -25,14 +34,17 @@ const toggleTokenDropdown = () => {
 
 <template>
     <div class="flex flex-col w-full gap-2">
-        <div v-for="part in message.parts?.filter(p => p.content?.trim() !== '' || p.toolCall)" :key="part.id">
-            <Reasoning v-if="part.type === 'reasoning'" :part="part" />
-            <Text v-else-if="part.type === 'text'" :part="part" />
-            <Tool v-else-if="part.type === 'tool-call'" :tool-call="part.toolCall!" :part="part"></Tool>
-            <div v-else>
-                Unhandled part type: {{ part.type }} {{ part }}
-            </div>
-        </div>
+        <template v-for="part in message.parts" :key="part.id">
+            <template v-if="part.content?.trim() !== '' || part.toolCall">
+                <Reasoning v-if="part.type === 'reasoning'" :part="part"></Reasoning>
+                <MarkdownRenderer v-else-if="part.type === 'text'" :finished="part.finished" :id="part.id"
+                    :content="part.content!" :sources="sources" :citations="true"></MarkdownRenderer>
+                <Tool v-else-if="part.type === 'tool-call'" :tool-call="part.toolCall!" :part="part"></Tool>
+                <div v-else>
+                    Unhandled part type: {{ part.type }} {{ part }}
+                </div>
+            </template>
+        </template>
 
         <span class="flex items-center gap-1"
             v-if="message.generation?.status === 'pending' && (message.parts || []).length === 0">
diff --git a/app/components/Message/index.vue b/app/components/Message/index.vue
index 6be66bf..fac87e8 100644
--- a/app/components/Message/index.vue
+++ b/app/components/Message/index.vue
@@ -1,5 +1,6 @@
 <script setup lang="ts">
 import type { Message } from '~/composables/useChat';
+import { getActiveMessage, getCurrentChildIndex, getMessageCount, getNextActiveChildId } from '~~/utils/message';
 
 const { openDialog } = useDialog();
 
@@ -35,7 +36,9 @@ watch(() => message.activeChildId, async (newValue) => {
 });
 
 watch(() => message.children.length, (newCount, oldCount) => {
-    if (newCount === oldCount) return;
+    if (newCount === oldCount) {
+        return;
+    }
 
     if (newCount === 0) {
         emit('patch', { activeChildId: null });
@@ -56,19 +59,17 @@ watch(() => message.children.length, (newCount, oldCount) => {
     }
 });
 
-const activeMessage = computed(() => {
-    if (message.activeChildId && message.children.length > 0) {
-        const child = message.children.find(c => c?.id === message.activeChildId);
-        if (child) return child;
+watch(() => message.deleted, (isDeleted) => {
+    if (isDeleted && message.children.length > 0) {
+        const activeChild = message.children.find(c => c?.id === message.activeChildId);
+        if (!activeChild) {
+            emit('patch', { activeChildId: message.children[0]?.id ?? null });
+        }
     }
-
-    if (message.deleted === true && message.children.length > 0) {
-        return message.children[0];
-    }
-
-    return message;
 });
 
+const activeMessage = computed(() => getActiveMessage(message));
+
 const copied = ref(false);
 const copyMessage = async () => {
     if (activeMessage.value!.role === 'user') {
@@ -135,91 +136,118 @@ const deleteMessage = () => {
     emit('delete');
 };
 
-const messageCount = computed(() => {
-    if (message.deleted === true) {
-        return message.children.length;
-    }
+const messageCount = computed(() => getMessageCount(message));
 
-    return message.children.length + 1;
-});
-
-const currentChildIndex = computed(() => {
-    if (!message.activeChildId) return 0;
-    const idx = message.children.findIndex(c => c?.id === message.activeChildId);
-    return idx >= 0 ? idx + 1 : 0;
-});
+const currentChildIndex = computed(() => getCurrentChildIndex(message));
 
 const navigateChild = (direction: -1 | 1) => {
-    const allItems = message.deleted === true
-        ? message.children
-        : [null, ...message.children];
+    const nextActiveChildId = getNextActiveChildId(message, direction);
+    emit('patch', { activeChildId: nextActiveChildId });
+};
 
-    const currentIdx = allItems.findIndex(item =>
-        !item ? !message.activeChildId : item.id === message.activeChildId
-    );
+const { show: showTooltip, hide: hideTooltip } = useTooltip();
 
-    const newIdx = Math.max(0, Math.min(allItems.length - 1, currentIdx + direction));
-    const newItem = allItems[newIdx];
+let hasCursor: boolean | null = null;
+const checkHasCursor = () => {
+    if (hasCursor === null && typeof window !== 'undefined') {
+        hasCursor = window.matchMedia('(hover: hover) and (pointer: fine)').matches;
+    }
+    return hasCursor ?? false;
+};
 
-    emit('patch', { activeChildId: newItem?.id ?? null });
+const handleTooltipHover = (e: MouseEvent) => {
+    if (!checkHasCursor()) {
+        return;
+    }
+    const target = (e.target as HTMLElement).closest('[data-hotkey], [data-tooltip]') as HTMLElement | null;
+    if (!target) {
+        return;
+    }
+    const hotkey = target.dataset.hotkey ? target.dataset.hotkey.split(',') : undefined;
+    const text = target.dataset.tooltip || undefined;
+    showTooltip(target, hotkey, text);
+};
+
+const handleTooltipLeave = () => {
+    hideTooltip();
+};
+
+const handleAction = (e: MouseEvent) => {
+    const trigger = (e.target as HTMLElement).closest('[data-action]') as HTMLElement | null;
+    if (!trigger) {
+        return;
+    }
+    switch (trigger.dataset.action) {
+        case 'prev-child':
+            navigateChild(-1);
+            break;
+        case 'next-child':
+            navigateChild(1);
+            break;
+        case 'regenerate':
+            regenerateMessage();
+            break;
+        case 'edit':
+            handleEdit();
+            break;
+        case 'copy':
+            copyMessage();
+            break;
+        case 'fork':
+            forkMessage();
+            break;
+        case 'delete':
+            deleteMessage();
+            break;
+    }
 };
 </script>
 
 <template>
     <div v-if="activeMessage" class="max-w-full mb-4 group flex flex-col">
-        <div :class="[message.role === 'user' ? 'pl-9 flex justify-end' : '']">
-            <MessageUser v-if="message.role === 'user'" :message="activeMessage!" />
-            <MessageAgent v-else :message="activeMessage" />
-        </div>
-        <div class="flex justify-between items-center">
-            <div>
-                <div v-if="messageCount > 1" class="flex gap-1">
-                    <Tooltip :inert="currentChildIndex === 0" :hotkey="['alt', '[']">
-                        <button @click="navigateChild(-1)"
-                            class="@hover:bg-[var(--color-hover)] rounded transition duration-150 ease-[cubic-bezier(0.5,_1,_0.89,_1)]">
-                            <span class="i-mynaui-chevron-left w-4 h-4 text-[var(--text-secondary)]"
-                                :class="currentChildIndex === 0 ? 'opacity-0' : ''"></span>
-                        </button>
-                    </Tooltip>
-                    <span class="text-xs text-[var(--text-secondary)]">
-                        {{ currentChildIndex + 1 }} / {{ messageCount }}
-                    </span>
-                    <Tooltip :inert="currentChildIndex + 1 === messageCount" :hotkey="['alt', ']']">
-                        <button @click="navigateChild(1)"
-                            class="@hover:bg-[var(--color-hover)] rounded transition duration-150 ease-[cubic-bezier(0.5,_1,_0.89,_1)]">
-                            <span class="i-mynaui-chevron-right w-4 h-4 text-[var(--text-secondary)]"
-                                :class="currentChildIndex + 1 === messageCount ? 'opacity-0' : ''"></span>
-                        </button>
-                    </Tooltip>
-                </div>
+        <MessageUser v-if="message.role === 'user'" class="pl-9 self-end" :message="activeMessage!"></MessageUser>
+        <MessageAgent v-else :message="activeMessage"></MessageAgent>
+        <div class="flex justify-between items-center" @click="handleAction">
+            <div v-if="messageCount > 1" class="flex gap-1"
+                @mouseover="handleTooltipHover" @mouseout="handleTooltipLeave">
+                <button data-action="prev-child" :data-hotkey="currentChildIndex > 0 ? 'alt,[' : undefined"
+                    class="@hover:bg-[var(--color-hover)] rounded transition duration-150 ease-[cubic-bezier(0.5,_1,_0.89,_1)]">
+                    <span class="i-mynaui-chevron-left w-4 h-4 text-[var(--text-secondary)] pointer-events-none"
+                        :class="currentChildIndex === 0 ? 'opacity-0' : ''"></span>
+                </button>
+                <span class="text-xs text-[var(--text-secondary)]">
+                    {{ currentChildIndex + 1 }} / {{ messageCount }}
+                </span>
+                <button data-action="next-child" :data-hotkey="currentChildIndex + 1 < messageCount ? 'alt,]' : undefined"
+                    class="@hover:bg-[var(--color-hover)] rounded transition duration-150 ease-[cubic-bezier(0.5,_1,_0.89,_1)]">
+                    <span class="i-mynaui-chevron-right w-4 h-4 text-[var(--text-secondary)] pointer-events-none"
+                        :class="currentChildIndex + 1 === messageCount ? 'opacity-0' : ''"></span>
+                </button>
             </div>
 
             <div v-show="activeMessage.generation?.status !== 'pending'"
-                class="self-end mt-1 w-fit bg-[var(--bg-container)] text-[var(--text-secondary)] gap-px flex items-center rounded-md overflow-hidden opacity-0 group-hover:opacity-100 transition-opacity duration-200 ease-[cubic-bezier(0.5,_1,_0.89,_1)]">
-                <Tooltip :hotkey="['ctrl', 'shift', 'enter']">
-                    <button @click="regenerateMessage"
-                        class="flex justify-center items-center w-7 h-6 @hover:bg-[var(--color-hover)]">
-                        <span class="i-mynaui-refresh text-4.5"></span>
-                    </button>
-                </Tooltip>
-                <button v-if="message.role === 'user'" @click="handleEdit"
+                @mouseover="handleTooltipHover" @mouseout="handleTooltipLeave"
+                class="ml-auto self-end mt-1 w-fit bg-[var(--bg-container)] text-[var(--text-secondary)] gap-px flex items-center rounded-md overflow-hidden opacity-0 group-hover:opacity-100 transition-opacity duration-200 ease-[cubic-bezier(0.5,_1,_0.89,_1)]">
+                <button data-action="regenerate" data-hotkey="ctrl,shift,enter"
                     class="flex justify-center items-center w-7 h-6 @hover:bg-[var(--color-hover)]">
-                    <span class="i-mynaui-pencil text-4.5"></span>
+                    <span class="i-mynaui-refresh text-4.5 pointer-events-none"></span>
                 </button>
-                <button @click="copyMessage" :class="{ 'text-emerald-500': copied }"
+                <button v-if="message.role === 'user'" data-action="edit"
                     class="flex justify-center items-center w-7 h-6 @hover:bg-[var(--color-hover)]">
-                    <span :class="copied ? 'i-mynaui-check text-emerald-500' : 'i-mynaui-copy text-4.5'"></span>
+                    <span class="i-mynaui-pencil text-4.5 pointer-events-none"></span>
                 </button>
-                <button @click="forkMessage"
+                <button data-action="copy" :class="{ 'text-emerald-500': copied }"
                     class="flex justify-center items-center w-7 h-6 @hover:bg-[var(--color-hover)]">
-                    <span class="i-mynaui-git-branch text-4.5"></span>
+                    <span :class="copied ? 'i-mynaui-check text-emerald-500' : 'i-mynaui-copy text-4.5'" class="pointer-events-none"></span>
+                </button>
+                <button data-action="fork"
+                    class="flex justify-center items-center w-7 h-6 @hover:bg-[var(--color-hover)]">
+                    <span class="i-mynaui-git-branch text-4.5 pointer-events-none"></span>
+                </button>
+                <button data-action="delete" data-hotkey="ctrl,shift,backspace"
+                    class="flex justify-center items-center w-7 h-6 text-red-500 @hover:bg-[var(--color-hover)]">
+                    <span class="i-mynaui-trash text-5 pointer-events-none"></span>
                 </button>
-                <Tooltip :hotkey="['ctrl', 'shift', 'backspace']">
-                    <button @click="deleteMessage"
-                        class="flex justify-center items-center w-7 h-6 text-red-500 @hover:bg-[var(--color-hover)]">
-                        <span class="i-mynaui-trash text-5"></span>
-                    </button>
-                </Tooltip>
             </div>
         </div>
     </div>
diff --git a/app/components/Sidenav/NavAgent.vue b/app/components/Sidenav/NavAgent.vue
index a948406..13b2a07 100644
--- a/app/components/Sidenav/NavAgent.vue
+++ b/app/components/Sidenav/NavAgent.vue
@@ -127,10 +127,12 @@ const autoRenameTopic = async (topicId: string) => {
 }
 
 const cancelAutoRename = async (topicId: string) => {
-    // TODO: make this more optimistic
-    await $fetch(`/api/topic/${topicId}/auto-rename/cancel`, {
-        method: 'POST',
+    const result = await $fetch(`/api/topic/${topicId}/auto-rename/cancel`, {
+        method: "POST",
     });
+    if (result.ok) {
+        patchTopicLocally(topicId, { renaming: false });
+    }
 }
 
 const renameTopicId = ref<string | null>(null);
@@ -256,12 +258,13 @@ onMounted(() => {
                                 v-model="newTopicName" @keydown.enter="saveRename" @keydown.escape="cancelRename"
                                 @blur="saveRename"
                                 class="flex-1 bg-transparent border-none outline-none md:text-sm font-medium text-[var(--text-primary)] px-0 min-w-0" />
-                            <div v-else-if="topic.renaming" class="flex w-full">
-                                <span class="i-svg-spinners-3-dots-fade text-7 md:text-6"></span>
+                            <div v-else class="flex items-center gap-2 min-w-0">
+                                <span class="md:text-sm font-medium overflow-hidden text-ellipsis whitespace-nowrap">
+                                    {{ topic.name }}
+                                </span>
+                                <span v-if="topic.renaming" aria-label="Renaming"
+                                    class="i-svg-spinners-3-dots-fade shrink-0 text-4"></span>
                             </div>
-                            <span v-else class="md:text-sm font-medium overflow-hidden text-ellipsis whitespace-nowrap">
-                                {{ topic.name }}
-                            </span>
 
                             <div data-action="toggle-dropdown"
                                 class="text-[var(--text-secondary)] shrink-0 w-0 max-w-0 opacity-0 overflow-hidden p-1 max-md:w-auto max-md:max-w-none max-md:opacity-100 flex items-center justify-center rounded-md @hover:bg-[var(--color-hover)] focus-visible:bg-[var(--color-hover)]"
diff --git a/app/components/Tooltip.vue b/app/components/Tooltip.vue
index e4ccb63..69eb10e 100644
--- a/app/components/Tooltip.vue
+++ b/app/components/Tooltip.vue
@@ -7,14 +7,16 @@ const props = defineProps<{
 const { show, hide } = useTooltip();
 const triggerRef = ref<HTMLElement | null>(null);
 
-const hasCursor = ref(false);
-
-onMounted(() => {
-    hasCursor.value = window.matchMedia('(hover: hover) and (pointer: fine)').matches;
-});
+let hasCursor: boolean | null = null;
+const checkHasCursor = () => {
+    if (hasCursor === null && typeof window !== 'undefined') {
+        hasCursor = window.matchMedia('(hover: hover) and (pointer: fine)').matches;
+    }
+    return hasCursor ?? false;
+};
 
 const onMouseEnter = () => {
-    if (triggerRef.value && hasCursor.value) {
+    if (triggerRef.value && checkHasCursor()) {
         show(triggerRef.value, props.hotkey, props.text);
     }
 };
diff --git a/app/composables/useAgents.ts b/app/composables/useAgents.ts
index 81dc02e..a99a818 100644
--- a/app/composables/useAgents.ts
+++ b/app/composables/useAgents.ts
@@ -1,4 +1,6 @@
+import type { BaseMessage } from "~/composables/useChat";
 import { nanoid } from "nanoid";
+import { provisionalTopicTitle } from "~~/utils/topic-title";
 import { attempt } from "~~/types/result";
 import * as schema from '~~/drizzle/schema';
 
@@ -153,11 +155,11 @@ export const useAgents = async () => {
 
     // TODO: since topics are contained within each agent struct, all topic
     // actions must be done through the agents composable
-    const createTopic = async (agentId: string) => {
+    const createTopic = async (agentId: string, message?: BaseMessage) => {
         const topicId = nanoid();
         const topic = {
             id: topicId,
-            name: 'New Topic',
+            name: provisionalTopicTitle(message),
             agentId,
         };
 
@@ -214,6 +216,9 @@ export const useAgents = async () => {
                         agentId: agent.id,
                         userId: agent.userId,
                         renaming: false,
+                        renameAttemptId: null,
+                        renameExpiresAt: null,
+                        titleSource: "manual",
                         createdAt: new Date(),
                     };
                     agents.value = agents.value.map(a =>
diff --git a/app/composables/useAutoScroll.ts b/app/composables/useAutoScroll.ts
index 04cc4f9..c1af491 100644
--- a/app/composables/useAutoScroll.ts
+++ b/app/composables/useAutoScroll.ts
@@ -15,6 +15,7 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
     let lastScrollTop = 0;
     let mutationRaf: number | null = null;
     let anchorRaf: number | null = null;
+    let anchorDebounceTimeout: ReturnType<typeof setTimeout> | null = null;
     let observer: MutationObserver | null = null;
     let resizeObserver: ResizeObserver | null = null;
     let lastWidth = 0;
@@ -26,15 +27,25 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
     const setUnhooked = (value: boolean) => {
         unhooked.value = value;
         shouldAutoScroll.value = !value;
+        if (!value) anchor = null;
     };
 
     const scrollToBottom = (behavior: ScrollBehavior = 'instant') => {
         const el = elementRef.value;
-        if (!el) return;
+        if (!el) {
+            return;
+        }
+
+        const bottom = Math.max(0, el.scrollHeight - el.clientHeight);
+        if (Math.abs(el.scrollTop - bottom) < 0.5) {
+            setUnhooked(false);
+            lastScrollTop = el.scrollTop;
+            return;
+        }
 
         isProgrammatic = true;
         el.scrollTo({
-            top: el.scrollHeight,
+            top: bottom,
             behavior,
         });
 
@@ -48,13 +59,19 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
     };
 
     const captureAnchor = (el: HTMLElement) => {
+        if (!unhooked.value) {
+            anchor = null;
+            return;
+        }
         const rect = el.getBoundingClientRect();
         const x = rect.left + rect.width / 2;
         const offsets = [4, 24, 48, 80, 120];
 
         for (const y of offsets) {
             const target = document.elementFromPoint(x, rect.top + y);
-            if (!target || target === el || !el.contains(target)) continue;
+            if (!target || target === el || !el.contains(target)) {
+                continue;
+            }
             anchor = {
                 element: target,
                 offsetFromTop: target.getBoundingClientRect().top - rect.top,
@@ -65,8 +82,8 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
         anchor = null;
     };
 
-    const scheduleAnchorCapture = () => {
-        if (anchorRaf !== null) return;
+    const requestAnchorCapture = () => {
+        if (!unhooked.value || anchorRaf !== null) return;
         anchorRaf = requestAnimationFrame(() => {
             anchorRaf = null;
             const el = elementRef.value;
@@ -74,13 +91,38 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
         });
     };
 
+    const scheduleAnchorCapture = () => {
+        const el = elementRef.value;
+        // Native scrollend is the primary path; debounce is only a fallback.
+        if (!el || 'onscrollend' in el || !unhooked.value) return;
+        if (anchorDebounceTimeout !== null) {
+            clearTimeout(anchorDebounceTimeout);
+        }
+        anchorDebounceTimeout = setTimeout(() => {
+            anchorDebounceTimeout = null;
+            requestAnchorCapture();
+        }, 150);
+    };
+
+    const handleScrollEnd = () => {
+        if (anchorDebounceTimeout !== null) {
+            clearTimeout(anchorDebounceTimeout);
+            anchorDebounceTimeout = null;
+        }
+        requestAnchorCapture();
+    };
+
     const restoreAnchor = (el: HTMLElement) => {
-        if (!anchor || !el.contains(anchor.element)) return;
+        if (!anchor || !el.contains(anchor.element)) {
+            return;
+        }
 
         const top = el.getBoundingClientRect().top;
         const delta =
             anchor.element.getBoundingClientRect().top - top - anchor.offsetFromTop;
-        if (Math.abs(delta) < 0.5) return;
+        if (Math.abs(delta) < 0.5) {
+            return;
+        }
 
         isProgrammatic = true;
         el.scrollTop += delta;
@@ -99,37 +141,54 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
 
     const handleScroll = () => {
         const el = elementRef.value;
-        if (!el) return;
+        if (!el) {
+            return;
+        }
 
         const scrollingUp = el.scrollTop < lastScrollTop;
         lastScrollTop = el.scrollTop;
 
-        scheduleAnchorCapture();
-
         if (isProgrammatic) {
-            if (isAtBottom(el)) setUnhooked(false);
+            if (isAtBottom(el)) {
+                setUnhooked(false);
+            }
             return;
         }
 
-        // Only re-hook when actually inside the bottom threshold.
-        // Mid-page scroll (up or down) must never re-enable stick.
+        // If the user is scrolling up, they are deliberately navigating away from the bottom.
+        // Unhook immediately so we never fight the scroll or snap back down.
+        if (scrollingUp) {
+            setUnhooked(true);
+            scheduleAnchorCapture();
+            return;
+        }
+
+        // Only re-hook when scrolling down into the bottom threshold.
         if (isAtBottom(el)) {
             setUnhooked(false);
             return;
         }
-
-        if (scrollingUp) {
-            setUnhooked(true);
-        }
+        scheduleAnchorCapture();
     };
 
     const followIfHooked = () => {
-        if (unhooked.value) return;
+        if (unhooked.value) {
+            return;
+        }
         scrollToBottom('instant');
     };
 
-    const handleMutation = () => {
-        if (mutationRaf !== null) return;
+    const handleMutation = (records: MutationRecord[]) => {
+        if (unhooked.value || mutationRaf !== null) {
+            return;
+        }
+        // The isolated sizing mirror changes on every keystroke, but cannot
+        // change scroll height. Keep observing real composer content (files,
+        // tool controls, etc.) as well as message content.
+        if (records.every(record => {
+            const target = record.target instanceof Element ? record.target : record.target.parentElement;
+            return target?.closest('[data-chat-measurement]');
+        })) return;
         mutationRaf = requestAnimationFrame(() => {
             mutationRaf = null;
             followIfHooked();
@@ -144,6 +203,7 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
 
         el.addEventListener('wheel', handleWheel, { passive: true });
         el.addEventListener('scroll', handleScroll, { passive: true });
+        el.addEventListener('scrollend', handleScrollEnd, { passive: true });
 
         observer = new MutationObserver(handleMutation);
         observer.observe(el, {
@@ -154,7 +214,9 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
 
         resizeObserver = new ResizeObserver(() => {
             const current = elementRef.value;
-            if (!current) return;
+            if (!current) {
+                return;
+            }
 
             const width = current.clientWidth;
             if (width === lastWidth) {
@@ -172,13 +234,18 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
                 return;
             }
 
+            if (!anchor) {
+                captureAnchor(current);
+            }
             restoreAnchor(current);
         });
         resizeObserver.observe(el);
 
         // Content already taller than the viewport on mount — catch up once
         requestAnimationFrame(() => {
-            if (!unhooked.value) scrollToBottom('instant');
+            if (!unhooked.value) {
+                scrollToBottom('instant');
+            }
         });
     };
 
@@ -186,6 +253,7 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
         if (el) {
             el.removeEventListener('wheel', handleWheel);
             el.removeEventListener('scroll', handleScroll);
+            el.removeEventListener('scrollend', handleScrollEnd);
         }
         observer?.disconnect();
         observer = null;
@@ -199,12 +267,18 @@ export function useAutoScroll(elementRef: Ref<HTMLElement | null>, options: {
             cancelAnimationFrame(anchorRaf);
             anchorRaf = null;
         }
+        if (anchorDebounceTimeout !== null) {
+            clearTimeout(anchorDebounceTimeout);
+            anchorDebounceTimeout = null;
+        }
         anchor = null;
     };
 
     watch(elementRef, (newEl, oldEl) => {
         detach(oldEl ?? null);
-        if (newEl) attach(newEl);
+        if (newEl) {
+            attach(newEl);
+        }
     }, { immediate: true });
 
     onUnmounted(() => {
diff --git a/app/composables/useChat.ts b/app/composables/useChat.ts
index 1e31ec7..47b9a2b 100644
--- a/app/composables/useChat.ts
+++ b/app/composables/useChat.ts
@@ -1,7 +1,9 @@
 import { nanoid } from 'nanoid';
+import { toRaw } from 'vue';
 import * as schema from '~~/drizzle/schema';
 import { Err, Ok, type Result } from '~~/types/result';
 import { buildMessageTree } from '~~/utils/message';
+import { appendTextDelta, serializeTopicSnapshot } from '~~/utils/topic-sync';
 
 export type BaseMessage = {
     content: string;
@@ -38,7 +40,7 @@ export enum ChatErrorType {
     Unimplemented,
 }
 
-type Event = { type: string; payload: any; timestamp: number };
+type Event = { type: string; payload: any; timestamp: number; replay?: boolean };
 
 const TARGET_UPDATES_PER_SECOND = 24;
 
@@ -46,6 +48,10 @@ export const useChat = async (topicId: MaybeRef<string>, connect = true) => {
     let data = useState<Topic & { messages: Message[] } | undefined>('useChat:data', () => undefined);
 
     let sse: EventSource | undefined;
+    let disposed = false;
+    let connectionAttempt = 0;
+    let reconnectTimeout: ReturnType<typeof setTimeout> | undefined;
+    const { promise: connectionReady, resolve: markConnected } = Promise.withResolvers<void>();
 
     const textDeltaBuffer: Map<string, Map<string, {
         content: string;
@@ -64,7 +70,7 @@ export const useChat = async (topicId: MaybeRef<string>, connect = true) => {
             for (const [partId, content] of parts) {
                 const part = msg.parts?.find(p => p.id === partId);
                 if (part) {
-                    part.content += content.content;
+                    part.content = content.content;
                     part.lastUpdatedAt = new Date(content.lastUpdatedAt);
                 }
             }
@@ -93,6 +99,23 @@ export const useChat = async (topicId: MaybeRef<string>, connect = true) => {
         flushTimeout = setTimeout(flushTextDeltas, 1000 / TARGET_UPDATES_PER_SECOND);
     };
 
+    const resetTextDeltas = () => {
+        if (flushTimeout !== undefined) clearTimeout(flushTimeout);
+        flushTimeout = undefined;
+        textDeltaBuffer.clear();
+        flushCbs.clear();
+    };
+
+    const scheduleReconnect = (forceSnapshot = false) => {
+        sse?.close();
+        sse = undefined;
+        if (disposed || reconnectTimeout !== undefined) return;
+        reconnectTimeout = setTimeout(() => {
+            reconnectTimeout = undefined;
+            void connectSSE(forceSnapshot);
+        }, 1500);
+    };
+
     const processEvent = (event: Event) => {
         if (!data.value) return;
 
@@ -102,12 +125,17 @@ export const useChat = async (topicId: MaybeRef<string>, connect = true) => {
             case 'MESSAGE_CREATED': {
                 // Push the new message if it doesn't exist (prevents duplicates from HTTP vs SSE)
                 if (!data.value.messages.find(m => m.id === payload.id)) {
-                    data.value.messages.push({ ...payload, parts: [] });
+                    data.value.messages.push({ ...payload, parts: payload.parts ?? [], attachments: payload.attachments ?? [] });
                 } else {
                     // replace the existing data with the new data
                     const index = data.value.messages.findIndex(m => m.id === payload.id);
-                    if (index !== -1) {
-                        data.value.messages[index] = { ...payload, parts: [] };
+                    if (index !== -1 && !event.replay) {
+                        const existing = data.value.messages[index]!;
+                        data.value.messages[index] = {
+                            ...payload,
+                            parts: payload.parts ?? [],
+                            attachments: payload.attachments ?? existing.attachments ?? [],
+                        };
                     }
                 }
                 break;
@@ -130,7 +158,9 @@ export const useChat = async (topicId: MaybeRef<string>, connect = true) => {
                 const msg = data.value.messages.find(m => m.id === payload.messageId);
                 if (msg) {
                     if (!msg.parts) msg.parts = [];
-                    msg.parts.push(payload.part);
+                    if (!msg.parts.some(part => part.id === payload.part.id)) {
+                        msg.parts.push(payload.part);
+                    }
                 }
                 break;
             }
@@ -138,18 +168,33 @@ export const useChat = async (topicId: MaybeRef<string>, connect = true) => {
             case 'text-delta': {
                 const msg = data.value.messages.find(m => m.id === payload.messageId);
                 if (!msg) break;
+                const part = msg.parts?.find(part => part.id === payload.partId);
+                if (!part || part.finished) break;
 
                 if (!textDeltaBuffer.has(payload.messageId)) {
                     textDeltaBuffer.set(payload.messageId, new Map());
                 }
                 const messageBuffer = textDeltaBuffer.get(payload.messageId)!;
-                const existing = messageBuffer.get(payload.partId)?.content || '';
-                messageBuffer.set(payload.partId, { content: existing + payload.content, lastUpdatedAt: payload.lastUpdatedAt });
+                const existing = messageBuffer.get(payload.partId)?.content ?? part.content ?? '';
+                if (typeof payload.offset === 'number' && payload.offset > existing.length) {
+                    scheduleReconnect(true);
+                    break;
+                }
+                const content = appendTextDelta(existing, payload.content, payload.offset);
+                if (content === existing) break;
+                messageBuffer.set(payload.partId, { content, lastUpdatedAt: payload.lastUpdatedAt });
 
                 scheduleFlush();
                 break;
             }
 
+            case 'text-delete': {
+                const msg = data.value.messages.find(m => m.id === payload.messageId);
+                if (msg?.parts) msg.parts = msg.parts.filter(part => part.id !== payload.partId);
+                textDeltaBuffer.get(payload.messageId)?.delete(payload.partId);
+                break;
+            }
+
             case 'text-end': {
                 const msg = data.value.messages.find(m => m.id === payload.messageId);
                 const part = msg?.parts?.find(p => p.id === payload.partId);
@@ -175,7 +220,9 @@ export const useChat = async (topicId: MaybeRef<string>, connect = true) => {
                     if (!part.createdAt) {
                         part.createdAt = new Date().toISOString();
                     }
-                    msg.parts.push(part);
+                    if (!msg.parts.some(existing => existing.id === part.id)) {
+                        msg.parts.push(part);
+                    }
                 }
                 break;
             }
@@ -229,55 +276,79 @@ export const useChat = async (topicId: MaybeRef<string>, connect = true) => {
         }
     }
 
-    const connectSSE = async () => {
-        const { promise, resolve } = Promise.withResolvers<void>();
-
+    const connectSSE = async (forceSnapshot = false) => {
+        if (disposed) return;
+        const attempt = ++connectionAttempt;
         const id = unref(topicId);
-        const lastUpdate = data.value?.messages.at(-1)?.updatedAt || '0';
-        const msgCount = data.value?.messages.length || 0;
-
-        if (sse && sse.readyState !== EventSource.CLOSED) {
-            if (!(new URL(sse.url).pathname.startsWith(`/api/topic/${id}`))) {
-                sse.close();
-            } else {
-                return;
+        sse?.close();
+        if (flushTimeout !== undefined) {
+            clearTimeout(flushTimeout);
+            flushTextDeltas();
+        }
+        let offeredSnapshot: string | undefined;
+        const query = new URLSearchParams();
+        if (!forceSnapshot && data.value?.id === id && globalThis.crypto?.subtle) {
+            try {
+                offeredSnapshot = serializeTopicSnapshot(toRaw(data.value));
+                const digest = await crypto.subtle.digest('SHA-256', new TextEncoder().encode(offeredSnapshot));
+                query.set('snapshot', Array.from(new Uint8Array(digest), byte => byte.toString(16).padStart(2, '0')).join(''));
+            } catch {
+                // Fingerprinting is an optimization; a full snapshot remains safe.
+                offeredSnapshot = undefined;
             }
         }
+        if (disposed || attempt !== connectionAttempt) return;
 
-        sse = new EventSource(`/api/topic/${id}?lastUpdate=${lastUpdate}&count=${msgCount}`);
+        const source = new EventSource(`/api/topic/${id}?${query}`);
+        sse = source;
+        source.addEventListener('error', () => {
+            if (sse === source) scheduleReconnect();
+        });
 
-        sse.addEventListener("error", (e) => {
-            console.error('sse error', e);
-            setTimeout(connectSSE, 1500);
-        })
-
-        sse.addEventListener("message", (e) => {
+        source.addEventListener('message', (e) => {
+            if (disposed || sse !== source) return;
             const raw = JSON.parse(e.data);
             const events: Event[] = Array.isArray(raw) ? raw : [raw];
 
-            for (const { type, payload, timestamp } of events) {
+            for (const event of events) {
+                const { type, payload } = event;
                 if (!type || !payload) continue;
 
-                if (type === 'initial_state') {
-                    data.value = payload;
-                    resolve()
+                if (type === 'synced') {
+                    // Optimistic edits can occur while the handshake is in flight.
+                    // Only retain the exact state that we offered to the server.
+                    if (offeredSnapshot !== serializeTopicSnapshot(toRaw(data.value))) {
+                        scheduleReconnect(true);
+                        return;
+                    }
+                    offeredSnapshot = undefined;
+                    markConnected();
                     continue;
                 }
 
-                processEvent({ type, payload, timestamp });
+                if (type === 'initial_state') {
+                    resetTextDeltas();
+                    data.value = payload;
+                    offeredSnapshot = undefined;
+                    markConnected();
+                    continue;
+                }
+
+                processEvent(event);
             }
         });
 
-        await promise;
-    }
+        await connectionReady;
+    };
 
 
     if (connect) {
         onBeforeUnmount(() => {
-            if (flushTimeout) {
-                clearTimeout(flushTimeout);
-                flushTextDeltas();
-            }
+            disposed = true;
+            connectionAttempt++;
+            if (reconnectTimeout !== undefined) clearTimeout(reconnectTimeout);
+            resetTextDeltas();
+            markConnected();
             if (sse) {
                 console.log('[SSE] Closing connection');
                 sse.close();
@@ -525,38 +596,76 @@ export const useChat = async (topicId: MaybeRef<string>, connect = true) => {
     }
 
     const deleteMessagesFocusedDescendant = async (messageId: string): Promise<Result<void, Error>> => {
-        if (!data.value) return Err(new Error('No data'));
+        if (!data.value) {
+            return Err(new Error("No data"));
+        }
 
-        const msg = data.value.messages.find(m => m.id === messageId);
-        if (!msg) return Err(new Error('Message not found'));
+        const msg = data.value.messages.find((m) => {
+            return m.id === messageId;
+        });
+        if (!msg) {
+            return Err(new Error("Message not found"));
+        }
 
-        const previousMessages = data.value!.messages;
+        const previousMessages = data.value.messages;
 
         const res = await $fetch(`/api/messages/${messageId}`, {
-            method: 'DELETE',
+            method: "DELETE",
             onRequest() {
-                if (!msg.activeChildId && (msg.parentMessageId === null || msg.parentMessageId === undefined)) {
-                    msg.deleted = true;
+                if (!data.value) {
                     return;
                 }
 
-                const parent = data.value!.messages.find(m => m.id === msg.parentMessageId);
-                data.value!.messages = data.value!.messages.filter(m => m.id !== msg.id);
-                if (parent?.deleted) {
-                    data.value!.messages = data.value!.messages.filter(m => m.id !== parent.id);
+                if (msg.parentMessageId) {
+                    const parent = data.value.messages.find((m) => {
+                        return m.id === msg.parentMessageId;
+                    });
+                    data.value.messages = data.value.messages.filter((m) => {
+                        return m.id !== msg.id;
+                    });
+                    if (parent) {
+                        const remainingChildren = data.value.messages.filter((m) => {
+                            return m.parentMessageId === parent.id;
+                        });
+                        if (parent.deleted && remainingChildren.length === 0) {
+                            data.value.messages = data.value.messages.filter((m) => {
+                                return m.id !== parent.id;
+                            });
+                        } else if (parent.activeChildId === msg.id) {
+                            parent.activeChildId = remainingChildren.length > 0
+                                ? (parent.deleted ? remainingChildren[0]!.id : remainingChildren[remainingChildren.length - 1]!.id)
+                                : null;
+                        }
+                    }
+                    return;
                 }
+
+                const children = data.value.messages.filter((m) => {
+                    return m.parentMessageId === msg.id;
+                });
+                if (children.length === 0) {
+                    data.value.messages = data.value.messages.filter((m) => {
+                        return m.id !== msg.id;
+                    });
+                    return;
+                }
+
+                msg.deleted = true;
+                msg.activeChildId = children[0]?.id ?? null;
             },
             onResponseError() {
-                data.value!.messages = previousMessages;
+                if (data.value) {
+                    data.value.messages = previousMessages;
+                }
             },
         });
 
         if (!res.ok) {
-            return Err(new Error('Failed to delete message'));
+            return Err(new Error("Failed to delete message"));
         }
 
         return Ok(undefined);
-    }
+    };
 
     return {
         topic,
diff --git a/app/composables/useTokenDropdown.ts b/app/composables/useTokenDropdown.ts
index 60d6dad..d7d2c04 100644
--- a/app/composables/useTokenDropdown.ts
+++ b/app/composables/useTokenDropdown.ts
@@ -8,8 +8,6 @@ export const useTokenDropdown = () => {
     const triggerElement = useState<HTMLElement | null>('token-dropdown:trigger', () => null);
 
     const open = (generation: Generation, trigger: HTMLElement) => {
-        console.log("open", generation, trigger);
-
         activeGeneration.value = generation;
         triggerElement.value = trigger;
         isOpen.value = true;
diff --git a/app/composables/useTopic.ts b/app/composables/useTopic.ts
index 67f5b2d..bf11493 100644
--- a/app/composables/useTopic.ts
+++ b/app/composables/useTopic.ts
@@ -10,7 +10,7 @@ export const useTopic = () => {
         FailedToDecryptProviderApiKey,
         FailedToGenerate,
     }
-    const autoRename = async (topicId: string): Promise<Result<string, AutoRenameError>> => {
+    const autoRename = async (topicId: string): Promise<Result<void, AutoRenameError>> => {
         const { settings } = await useUserSettings();
 
         if (!settings.value.systemAssistants.rename.enabled) {
@@ -54,7 +54,7 @@ export const useTopic = () => {
             }
         }
 
-        const { agents } = await useAgents();
+        const { patchTopicLocally, refresh } = await useAgents();
 
         try {
             // @ts-ignore - excessive stack depth
@@ -65,31 +65,20 @@ export const useTopic = () => {
                     providerApiKey,
                 }),
                 onRequest() {
-                    const topics = agents.value.flatMap(agent => agent.topics);
-                    const topic = topics.find(topic => topic.id === topicId);
-                    if (topic) {
-                        agents.value = agents.value.map(agent => {
-                            return agent.id === topic.agentId ? { ...agent, topics: agent.topics.map(t => t.id === topic.id ? { ...topic, renaming: true } : t) } : agent;
-                        });
-                    }
+                    patchTopicLocally(topicId, { renaming: true });
                 },
-                onRequestError() {
-                    const topics = agents.value.flatMap(agent => agent.topics);
-                    const topic = topics.find(topic => topic.id === topicId);
-                    if (topic) {
-                        agents.value = agents.value.map(agent => {
-                            return agent.id === topic.agentId ? { ...agent, topics: agent.topics.map(t => t.id === topic.id ? { ...topic, renaming: false } : t) } : agent;
-                        });
-                    }
-                },
-            }) as { ok: true, renameId: string } | { ok: false, code: string };
+            });
             if (!res.ok) {
+                patchTopicLocally(topicId, { renaming: false });
+                await refresh();
                 console.error('Failed to auto-rename:', res.code);
                 return Err(AutoRenameError.FailedToGenerate);
             }
 
-            return Ok(res.renameId);
+            return Ok(undefined);
         } catch (error) {
+            patchTopicLocally(topicId, { renaming: false });
+            await refresh();
             console.error('Failed to auto-rename:', error);
             return Err(AutoRenameError.FailedToGenerate);
         }
diff --git a/app/composables/useUserEvents.ts b/app/composables/useUserEvents.ts
index 04a4490..99ee75c 100644
--- a/app/composables/useUserEvents.ts
+++ b/app/composables/useUserEvents.ts
@@ -1,11 +1,14 @@
 export const useUserEvents = () => {
     const eventSource = ref<EventSource | null>(null);
+    const agents = useState<AgentWithTopics[]>("agents_state", () => []);
     const isConnected = useState('userEvents:connected', () => false);
     const lastEventTimestamp = useState<number>('userEvents:lastTimestamp', () => 0);
 
     const reconnectAttempts = ref(0);
     const connectionStartTime = ref<number>(0);
     const pendingReconnect = ref<NodeJS.Timeout | null>(null);
+    let reconciliationTimer: ReturnType<typeof setInterval> | undefined;
+    let reconciling = false;
 
     const BASE_DELAY = 1000;
     const MAX_DELAY = 30000;
@@ -50,7 +53,6 @@ export const useUserEvents = () => {
         cleanup();
 
         connectionStartTime.value = Date.now();
-        reconnectAttempts.value = 0;
 
         const source = new EventSource('/api/events');
         eventSource.value = source;
@@ -59,6 +61,7 @@ export const useUserEvents = () => {
             console.log('User events connected');
             isConnected.value = true;
             reconnectAttempts.value = 0;
+            void reconcile();
         };
 
         source.onerror = () => {
@@ -164,20 +167,48 @@ export const useUserEvents = () => {
     };
 
     const reconcile = async () => {
-        console.log('Reconciling user state...');
-        const { data } = await useFetch<AgentWithTopics[]>('/api/agents');
-        if (data.value) {
-            const { agents } = await useAgents();
-            agents.value = data.value;
+        if (reconciling) {
+            return;
+        }
+        reconciling = true;
+        try {
+            agents.value = await $fetch<AgentWithTopics[]>("/api/agents");
+        } catch (error) {
+            console.error("Failed to reconcile topics:", error);
+        } finally {
+            reconciling = false;
         }
     };
 
+    const resume = () => {
+        if (document.visibilityState !== "visible") {
+            return;
+        }
+        if (!isConnected.value) {
+            reconnectAttempts.value = 0;
+            void connect();
+        }
+        void reconcile();
+    };
+
     onMounted(() => {
-        connect();
+        void connect();
+        document.addEventListener("visibilitychange", resume);
+        window.addEventListener("online", resume);
+        window.addEventListener("pageshow", resume);
+        reconciliationTimer = setInterval(() => {
+            if (document.visibilityState === "visible" && agents.value.some(agent => agent.topics.some(topic => topic.renaming))) {
+                void reconcile();
+            }
+        }, 15000);
     });
 
     onBeforeUnmount(() => {
         cleanup();
+        clearInterval(reconciliationTimer);
+        document.removeEventListener("visibilitychange", resume);
+        window.removeEventListener("online", resume);
+        window.removeEventListener("pageshow", resume);
     });
 
     return {
diff --git a/app/layouts/default.vue b/app/layouts/default.vue
index 3015cb0..5eab7e4 100644
--- a/app/layouts/default.vue
+++ b/app/layouts/default.vue
@@ -18,8 +18,7 @@ useHead({
 });
 
 if (import.meta.client) {
-    const { connect } = useUserEvents();
-    connect();
+    useUserEvents();
 }
 </script>
 
@@ -28,7 +27,7 @@ if (import.meta.client) {
     <div class="p-2 w-full h-full max-w-full overflow-x-hidden">
         <main
             class="bg-[var(--bg-surface)] flex flex-col h-full w-full border border-solid border-[var(--color-border)] rounded-lg overflow-hidden">
-            <div class="flex-1 overflow-y-auto">
+            <div class="flex-1 min-h-0 flex flex-col">
                 <slot />
             </div>
         </main>
diff --git a/app/pages/agent/[id]/index.vue b/app/pages/agent/[id]/index.vue
index c05d210..07effc3 100644
--- a/app/pages/agent/[id]/index.vue
+++ b/app/pages/agent/[id]/index.vue
@@ -66,7 +66,7 @@ const handleSubmit = async (message: BaseMessage, model: ModelWithProvider | nul
         updatedAt: new Date(),
     }
 
-    const topic = await createTopic(agent.value!.id);
+    const topic = await createTopic(agent.value!.id, message);
     if (!topic) throw new Error('Failed to create topic');
 
     const { sendMessage, startGeneration } = await useChat(topic.id, false);
@@ -100,7 +100,7 @@ const handleAddMessage = async (message: BaseMessage, role: 'user' | 'assistant'
         return;
     }
 
-    const topic = await createTopic(agent.value!.id);
+    const topic = await createTopic(agent.value!.id, message);
     if (!topic) throw new Error('Failed to create topic');
 
     const { sendMessage } = await useChat(topic.id, false);
@@ -118,7 +118,8 @@ const handleAddMessage = async (message: BaseMessage, role: 'user' | 'assistant'
 
 <template>
     <div class="flex flex-col h-full w-full max-w-full overflow-x-hidden">
-        <div class="h-14 flex items-center justify-between px-4 border-b border-[var(--color-border)]">
+        <div
+            class="z-5 h-14 flex items-center justify-between px-4 border-b border-[var(--color-border)] bg-[var(--bg-surface)]">
             <div class="flex items-center gap-2 max-w-full">
                 <button v-if="!sidebarOpen" @click="openSidebar"
                     class="flex p-2 rounded-lg text-[var(--text-primary)] bg-transparent @hover:bg-[var(--color-hover)] transition-colors">
@@ -131,7 +132,7 @@ const handleAddMessage = async (message: BaseMessage, role: 'user' | 'assistant'
         </div>
 
         <div ref="chatPaneWrapper"
-            class="chat-scroll-container justify-center w-full h-full [scrollbar-width:thin] [scrollbar-color:#888_transparent] overflow-y-scroll overflow-x-hidden flex justify-center pt-4">
+            class="chat-scroll-container justify-center w-full flex-1 min-h-0 [scrollbar-width:thin] [scrollbar-color:#888_transparent] overflow-y-scroll overflow-x-hidden flex justify-center pt-4">
             <div class="chatPane max-w-4xl w-full min-h-full flex flex-col px-4">
                 <div class="w-full px-px flex flex-col flex-grow gap-2"
                     :class="pendingMessage === null ? 'justify-end pb-28' : 'pb-9'">
diff --git a/app/pages/agent/[id]/topic/[topicId].vue b/app/pages/agent/[id]/topic/[topicId].vue
index d39d27e..a6f514d 100644
--- a/app/pages/agent/[id]/topic/[topicId].vue
+++ b/app/pages/agent/[id]/topic/[topicId].vue
@@ -1,9 +1,7 @@
 <script setup lang="ts">
 import { type BaseMessage, type Message, ChatErrorType } from '~/composables/useChat';
 import type { ModelWithProvider } from '~/composables/useModels';
-import { buildFocusedMessageTree } from '~~/utils/message';
-
-const rootStart = Date.now();
+import { buildFocusedMessageTree, getActiveMessage, getNextActiveChildId } from '~~/utils/message';
 
 const chatPaneWrapper = ref<HTMLElement | null>(null);
 const inputValue = ref<BaseMessage>({ content: '', fileIds: [] });
@@ -81,11 +79,10 @@ const handleRegenerate = async (message: Message) => {
         return;
     }
 
-    let messageId: string;
-    if (message.activeChildId && message.children.length > 0) {
-        messageId = message.activeChildId;
-    } else {
-        messageId = message.id;
+    const activeMsg = getActiveMessage(message);
+    if (!activeMsg) {
+        console.error('No active message');
+        return;
     }
 
     const model = allModels.value.find(m => m.id === agent.value!.defaultModelId);
@@ -94,20 +91,26 @@ const handleRegenerate = async (message: Message) => {
         return;
     }
 
-    const res = await regenerateMessage(messageId, buildFocusedMessageTree(topic.value!.messages), model);
+    const res = await regenerateMessage(activeMsg.id, buildFocusedMessageTree(topic.value!.messages), model);
     if (!res.ok) {
         console.error('Failed to regenerate message:', ChatErrorType[res.error]);
         return;
     }
-}
+};
 
 const flatMessages = computed(() => {
     const messages: Message[] = [];
 
     for (const message of topic.value?.messages ?? []) {
-        messages.push(message);
+        if (!message.deleted) {
+            messages.push(message);
+        }
         if (message.children.length > 0) {
-            messages.push(...message.children as Message[]);
+            for (const child of message.children) {
+                if (child && !child.deleted) {
+                    messages.push(child as Message);
+                }
+            }
         }
     }
 
@@ -115,11 +118,13 @@ const flatMessages = computed(() => {
 });
 
 const handleFork = async (message: Message) => {
-    const messageId = message.activeChildId && message.children.length > 0
-        ? message.activeChildId
-        : message.id;
+    const activeMsg = getActiveMessage(message);
+    if (!activeMsg) {
+        console.error('No active message');
+        return;
+    }
 
-    const newTopicId = await forkTopic(topicId.value, messageId);
+    const newTopicId = await forkTopic(topicId.value, activeMsg.id);
     if (newTopicId) {
         await navigateTo(`/agent/${route.params.id}/topic/${newTopicId}`);
     } else {
@@ -128,14 +133,12 @@ const handleFork = async (message: Message) => {
 };
 
 const handleDelete = async (rootMessage: Message) => {
-    let messageId: string;
-    if (rootMessage.activeChildId && rootMessage.children.length > 0) {
-        messageId = rootMessage.activeChildId;
-    } else {
-        messageId = rootMessage.id;
+    const activeMsg = getActiveMessage(rootMessage);
+    if (!activeMsg) {
+        return;
     }
 
-    const result = await deleteMessagesFocusedDescendant(messageId);
+    const result = await deleteMessagesFocusedDescendant(activeMsg.id);
     if (!result.ok) {
         console.error('Failed to delete message:', result.error);
         return;
@@ -145,7 +148,7 @@ const handleDelete = async (rootMessage: Message) => {
         await navigateTo(`/agent/${route.params.id}`);
         deleteTopic(route.params.id as string, topicId.value);
     }
-}
+};
 
 const { scrollToBottom, isAtBottom } = useAutoScroll(chatPaneWrapper);
 
@@ -198,76 +201,39 @@ addShortcut(['ctrl', 'shift', 'c'], (event) => {
     handleCancel();
 })
 
-addShortcut(['alt', '['], async (event) => {
+const navigateLastMessage = (direction: -1 | 1) => {
+    const lastMessage = topic.value?.messages?.at(-1);
+    if (!lastMessage || lastMessage.children.length === 0) {
+        return;
+    }
+
+    const nextActiveChildId = getNextActiveChildId(lastMessage, direction);
+    patchMessageLocally(lastMessage.id, { activeChildId: nextActiveChildId });
+};
+
+addShortcut(['alt', '['], (event) => {
     event.preventDefault();
     event.stopPropagation();
+    navigateLastMessage(-1);
+});
 
-    const lastMessage = topic.value?.messages?.at(-1);
-    if (lastMessage && lastMessage.children.length > 0) {
-        const currentIdx = lastMessage.children.findIndex(c => c?.id === lastMessage.activeChildId);
-        const prevIdx = Math.max(0, currentIdx);
-        if (currentIdx > 0) {
-            patchMessageLocally(lastMessage.id, { activeChildId: lastMessage.children[prevIdx - 1]!.id });
-        }
-    }
-})
-
-addShortcut(['alt', ']'], async (event) => {
+addShortcut(['ctrl', 'alt', 'arrowleft'], (event) => {
     event.preventDefault();
     event.stopPropagation();
+    navigateLastMessage(-1);
+});
 
-    const lastMessage = topic.value?.messages?.at(-1);
-    if (lastMessage && lastMessage.children.length > 0) {
-        const currentIdx = lastMessage.children.findIndex(c => c?.id === lastMessage.activeChildId);
-        const maxIdx = lastMessage.deleted ? lastMessage.children.length - 1 : lastMessage.children.length;
-        const nextIdx = Math.min(maxIdx, currentIdx + 1);
+addShortcut(['alt', ']'], (event) => {
+    event.preventDefault();
+    event.stopPropagation();
+    navigateLastMessage(1);
+});
 
-        if (lastMessage.deleted) {
-            patchMessageLocally(lastMessage.id, { activeChildId: lastMessage.children[nextIdx]?.id ?? null });
-        } else {
-            if (nextIdx === 0) {
-                patchMessageLocally(lastMessage.id, { activeChildId: null });
-            } else {
-                patchMessageLocally(lastMessage.id, { activeChildId: lastMessage.children[nextIdx - 1]?.id ?? null });
-            }
-        }
-    }
-})
-
-addShortcut(['ctrl', 'alt', 'arrowleft'], async (event) => {
-    const lastMessage = topic.value?.messages?.at(-1);
-    if (lastMessage && lastMessage.children.length > 0) {
-        event.preventDefault();
-        event.stopPropagation();
-
-        const currentIdx = lastMessage.children.findIndex(c => c?.id === lastMessage.activeChildId);
-        if (currentIdx > 0) {
-            patchMessageLocally(lastMessage.id, { activeChildId: lastMessage.children[currentIdx - 1]!.id });
-        }
-    }
-})
-
-addShortcut(['ctrl', 'alt', 'arrowright'], async (event) => {
-    const lastMessage = topic.value?.messages?.at(-1);
-    if (lastMessage && lastMessage.children.length > 0) {
-        event.preventDefault();
-        event.stopPropagation();
-
-        const currentIdx = lastMessage.children.findIndex(c => c?.id === lastMessage.activeChildId);
-        const maxIdx = lastMessage.deleted ? lastMessage.children.length - 1 : lastMessage.children.length;
-        const nextIdx = Math.min(maxIdx, currentIdx + 1);
-
-        if (lastMessage.deleted) {
-            patchMessageLocally(lastMessage.id, { activeChildId: lastMessage.children[nextIdx]?.id ?? null });
-        } else {
-            if (nextIdx === 0) {
-                patchMessageLocally(lastMessage.id, { activeChildId: null });
-            } else {
-                patchMessageLocally(lastMessage.id, { activeChildId: lastMessage.children[nextIdx - 1]?.id ?? null });
-            }
-        }
-    }
-})
+addShortcut(['ctrl', 'alt', 'arrowright'], (event) => {
+    event.preventDefault();
+    event.stopPropagation();
+    navigateLastMessage(1);
+});
 
 addShortcut(['ctrl', 'alt', 'backspace'], async (event) => {
     event.preventDefault();
@@ -287,13 +253,12 @@ const handleCancel = async () => {
         method: 'POST',
     });
 };
-
-console.log("full page render took", Date.now() - rootStart);
 </script>
 
 <template>
     <div class="flex flex-col h-full w-full max-w-full overflow-x-hidden">
-        <div class="h-14 flex items-center justify-between px-4 border-b border-[var(--color-border)]">
+        <div
+            class="z-5 h-14 flex items-center justify-between px-4 border-b border-[var(--color-border)] bg-[var(--bg-surface)]">
             <div class="flex items-center gap-2 max-w-full">
                 <button v-if="!sidebarOpen" @click="openSidebar"
                     class="flex p-2 rounded-lg text-[var(--text-primary)] bg-transparent @hover:bg-[var(--color-hover)] transition-colors">
@@ -307,7 +272,7 @@ console.log("full page render took", Date.now() - rootStart);
 
         <!-- chat pane -->
         <div ref="chatPaneWrapper"
-            class="chat-scroll-container justify-center w-full h-full [scrollbar-width:thin] [scrollbar-color:#888_transparent] overflow-y-scroll overflow-x-hidden flex justify-center pt-4">
+            class="chat-scroll-container justify-center w-full flex-1 min-h-0 [scrollbar-width:thin] [scrollbar-color:#888_transparent] overflow-y-scroll overflow-x-hidden flex justify-center pt-4">
             <div class="chatPane max-w-4xl w-full min-h-full flex flex-col px-4">
                 <div class="w-full px-px flex flex-col flex-grow gap-2 pb-9">
                     <Suspense>
diff --git a/app/pages/index.vue b/app/pages/index.vue
index b2290cb..1b5270d 100644
--- a/app/pages/index.vue
+++ b/app/pages/index.vue
@@ -95,7 +95,7 @@ const handleChatSubmit = async (message: BaseMessage, model: ModelWithProvider |
         }
     }
 
-    const topic = await createTopic(targetAgent.id);
+    const topic = await createTopic(targetAgent.id, message);
     if (!topic) {
         console.error('Failed to create topic');
         return;
diff --git a/app/utils/citations.ts b/app/utils/citations.ts
new file mode 100644
index 0000000..aaa7989
--- /dev/null
+++ b/app/utils/citations.ts
@@ -0,0 +1,45 @@
+import type { ComarkPlugin } from "comark";
+import type { SearchSource, StoredToolValue } from "./tool-rendering";
+import { parseToolValue, readSearchSources } from "./tool-rendering";
+
+export const citationPlugin: ComarkPlugin = {
+    name: "source-citations",
+    markdownItPlugins: [
+        (markdown) => {
+            markdown.inline.ruler.before("link", "source_citation", (state, silent) => {
+                if (state.linkLevel > 0 || !state.src.startsWith("[[cite:", state.pos)) {
+                    return false;
+                }
+                const match = /^\[\[cite:([a-zA-Z0-9_-]+(?:,[a-zA-Z0-9_-]+)*)\]\]/.exec(state.src.slice(state.pos));
+                if (!match) {
+                    return false;
+                }
+                if (silent) {
+                    return false;
+                }
+                const token = state.push("mdc_inline_component", "source-cite", 0);
+                token.attrSet("ids", match[1] ?? "");
+                state.pos += match[0].length;
+                return true;
+            });
+        },
+    ],
+};
+
+export const collectCitationSources = (
+    parts: readonly { toolCall?: { toolName: string; output?: StoredToolValue } | null }[],
+): ReadonlyMap<string, SearchSource> => {
+    const sources = new Map<string, SearchSource>();
+    for (const part of parts) {
+        if (part.toolCall?.toolName !== "search") {
+            continue;
+        }
+        const results = readSearchSources(parseToolValue(part.toolCall.output), { deduplicate: false });
+        for (const source of results ?? []) {
+            if (source.sourceId) {
+                sources.set(source.sourceId, source);
+            }
+        }
+    }
+    return sources;
+};
diff --git a/app/utils/composer-size.ts b/app/utils/composer-size.ts
new file mode 100644
index 0000000..60e7cfa
--- /dev/null
+++ b/app/utils/composer-size.ts
@@ -0,0 +1,11 @@
+export const getComposerHeight = (
+    scrollHeight: number,
+    lineHeight: number,
+    padding: number,
+    borders: number,
+    borderBox: boolean,
+): number => {
+    const contentHeight = Math.min(Math.max(scrollHeight - padding, lineHeight * 2), lineHeight * 10);
+    // A stable CSS-pixel boundary avoids 47.999… / 48.01 oscillations.
+    return Math.round(contentHeight + (borderBox ? padding + borders : 0));
+};
diff --git a/app/utils/markdown.ts b/app/utils/markdown.ts
index dad92dd..6b27cce 100644
--- a/app/utils/markdown.ts
+++ b/app/utils/markdown.ts
@@ -3,6 +3,7 @@ import { createSerializedMarkdownParser as createComarkParser } from 'comark';
 import breaks from 'comark/plugins/breaks';
 import footnotes from 'comark/plugins/footnotes';
 import math from 'comark/plugins/math';
+import { citationPlugin } from './citations';
 
 export type MarkdownTree = MarkdownDocument;
 export type MarkdownAstNode = Node;
@@ -39,10 +40,10 @@ const parserPlugins = [
     math(),
 ] as const;
 
-const createConfiguredParser = (autoClose: boolean) => createComarkParser({
+const createConfiguredParser = (autoClose: boolean, citations: boolean) => createComarkParser({
     registerDefaultPlugins: false,
     autoClose,
-    plugins: parserPlugins,
+    plugins: citations ? [...parserPlugins, citationPlugin] : parserPlugins,
 });
 
 const protectDollarRunsInLine = (line: string): string => {
@@ -89,6 +90,10 @@ const protectDollarRunsInLine = (line: string): string => {
 };
 
 const protectDollarRuns = (content: string): string => {
+    // Fast path: most messages contain no dollar runs; avoid line-splitting entirely.
+    if (!content.includes('$')) {
+        return content;
+    }
     const lines = content.split('\n');
     let inFence = false;
 
@@ -107,13 +112,16 @@ const protectDollarRuns = (content: string): string => {
     }).join('\n');
 };
 
-export const createMarkdownParser = () => {
-    const streamingParser = createConfiguredParser(true);
-    const finalParser = createConfiguredParser(false);
+export const createMarkdownParser = (options: { citations?: boolean } = {}) => {
+    const citations = options.citations === true;
+    const streamingParser = createConfiguredParser(true, citations);
+    const finalParser = createConfiguredParser(false, citations);
 
     return (content: string, options: { streaming?: boolean } = {}) => {
         const protectedContent = protectDollarRuns(content);
-        if (options.streaming === true) {
+        // Do not let auto-close complete an unfinished citation on the model's behalf.
+        const incompleteCitation = citations && /\[\[cite:[a-zA-Z0-9_,\-]*\]?$/.test(protectedContent);
+        if (options.streaming === true && !incompleteCitation) {
             return streamingParser(protectedContent, { streaming: true });
         }
 
@@ -121,6 +129,9 @@ export const createMarkdownParser = () => {
     };
 };
 
+export const agentParser = createMarkdownParser({ citations: true });
+export const userParser = createMarkdownParser({ citations: false });
+
 export const getNodeTag = (node: MarkdownAstNode): string | null => {
     if (!Array.isArray(node) || node[0] === null) {
         return null;
@@ -157,29 +168,7 @@ export const textContent = (node: MarkdownAstNode): string => {
     return getNodeChildren(node).map(textContent).join('');
 };
 
-const cloneNode = (node: MarkdownAstNode): MarkdownAstNode => {
-    if (typeof node === 'string') {
-        return node;
-    }
-
-    if (!Array.isArray(node)) {
-        return node;
-    }
-
-    if (node[0] === null) {
-        return [null, { ...node[1] }, node[2]];
-    }
-
-    return [
-        node[0],
-        { ...node[1] },
-        ...getNodeChildren(node).map(cloneNode),
-    ] as MarkdownElementNode;
-};
-
-const splitParagraph = (node: MarkdownElementNode): MarkdownElementNode[] => {
-    const attributes = { ...node[1] };
-    const children = getNodeChildren(node);
+const splitParagraph = (attributes: Record<string, unknown>, children: MarkdownAstNode[]): MarkdownElementNode[] => {
     const paragraphs: MarkdownElementNode[] = [];
     let current: MarkdownAstNode[] = [];
 
@@ -200,58 +189,80 @@ const splitParagraph = (node: MarkdownElementNode): MarkdownElementNode[] => {
     return paragraphs;
 };
 
-const transformChildren = (nodes: MarkdownAstNode[]): MarkdownAstNode[] => {
-    const result: MarkdownAstNode[] = [];
+const hasBrChild = (children: MarkdownAstNode[]): boolean =>
+    children.some((child) => getNodeTag(child) === 'br');
 
-    for (const originalNode of nodes) {
-        const node = cloneNode(originalNode);
-        if (typeof node === 'string' || !Array.isArray(node) || node[0] === null) {
-            result.push(node);
-            continue;
+/**
+ * Transform a single element node into its replacement list. Returns a
+ * single-element array holding the ORIGINAL node reference when nothing
+ * changed, so callers can skip all allocation for unaffected subtrees.
+ */
+const transformElement = (node: MarkdownElementNode): MarkdownAstNode[] => {
+    const tag = node[0];
+    const children = getNodeChildren(node);
+    const transformedChildren = transformChildren(children);
+
+    if (tag === 'p') {
+        if (!hasBrChild(transformedChildren)) {
+            if (transformedChildren === children) return [node];
+            return [[tag, { ...node[1] }, ...transformedChildren] as MarkdownElementNode];
         }
-
-        const tag = node[0];
-        const transformedChildren = transformChildren(getNodeChildren(node));
-        let transformedNode = [tag, { ...node[1] }, ...transformedChildren] as MarkdownElementNode;
-
-        if (tag === 'p') {
-            result.push(...splitParagraph(transformedNode));
-            continue;
-        }
-
-        if ((tag === 'li' || tag === 'blockquote') && transformedChildren.some((child) => getNodeTag(child) === 'br')) {
-            const segments: MarkdownAstNode[][] = [[]];
-            for (const child of transformedChildren) {
-                if (getNodeTag(child) === 'br') {
-                    segments.push([]);
-                } else {
-                    segments[segments.length - 1]?.push(child);
-                }
-            }
-
-            transformedNode = [
-                tag,
-                { ...node[1] },
-                ...segments
-                    .filter((segment) => segment.length > 0)
-                    .map((segment) => ['p', {}, ...segment] as MarkdownElementNode),
-            ] as MarkdownElementNode;
-        }
-
-        result.push(transformedNode);
+        return splitParagraph({ ...node[1] }, transformedChildren);
     }
 
-    return result;
+    if ((tag === 'li' || tag === 'blockquote') && hasBrChild(transformedChildren)) {
+        const segments: MarkdownAstNode[][] = [[]];
+        for (const child of transformedChildren) {
+            if (getNodeTag(child) === 'br') {
+                segments.push([]);
+            } else {
+                segments[segments.length - 1]?.push(child);
+            }
+        }
+
+        return [[
+            tag,
+            { ...node[1] },
+            ...segments
+                .filter((segment) => segment.length > 0)
+                .map((segment) => ['p', {}, ...segment] as MarkdownElementNode),
+        ] as MarkdownElementNode];
+    }
+
+    if (transformedChildren === children) return [node];
+    return [[tag, { ...node[1] }, ...transformedChildren] as MarkdownElementNode];
+};
+
+const transformChildren = (nodes: MarkdownAstNode[]): MarkdownAstNode[] => {
+    let result: MarkdownAstNode[] | null = null;
+
+    for (let index = 0; index < nodes.length; index++) {
+        const node = nodes[index]!;
+        const replacement = typeof node === 'string' || !Array.isArray(node) || node[0] === null
+            ? [node]
+            : transformElement(node);
+
+        if (result === null) {
+            if (replacement.length === 1 && replacement[0] === node) continue;
+            result = nodes.slice(0, index);
+        }
+        result.push(...replacement);
+    }
+
+    return result ?? nodes;
 };
 
 /**
  * Comark's breaks plugin emits `br` nodes. Promote each hard break to a
  * sibling paragraph to keep the chat renderer's established layout.
+ *
+ * Copy-on-write: trees without `br` nodes are returned by reference with no
+ * allocation, so the common case costs a single tag scan per node.
  */
-export const splitParagraphBreaks = (tree: MarkdownTree): MarkdownTree => ({
-    ...tree,
-    nodes: transformChildren(tree.nodes),
-});
+export const splitParagraphBreaks = (tree: MarkdownTree): MarkdownTree => {
+    const nodes = transformChildren(tree.nodes);
+    return nodes === tree.nodes ? tree : { ...tree, nodes };
+};
 
 export const toVueAttributes = (attributes: Record<string, unknown>): Record<string, unknown> => {
     const result: Record<string, unknown> = {};
diff --git a/app/utils/tool-rendering.ts b/app/utils/tool-rendering.ts
index a3bacc1..ed28064 100644
--- a/app/utils/tool-rendering.ts
+++ b/app/utils/tool-rendering.ts
@@ -21,6 +21,7 @@ export const formatToolValue = (stored: StoredToolValue): string => {
 };
 
 export interface SearchSource {
+    sourceId?: string;
     title: string;
     url: string;
     hostname: string;
@@ -41,7 +42,7 @@ export const readSearchWarnings = (value: unknown): { engine: string; reason: st
     });
 };
 
-export const readSearchSources = (value: unknown): SearchSource[] | null => {
+export const readSearchSources = (value: unknown, options: { deduplicate?: boolean } = {}): SearchSource[] | null => {
     // Older tool calls stored the results array directly.
     if (typeof value === "object" && value !== null && "results" in value) {
         value = value.results;
@@ -65,11 +66,12 @@ export const readSearchSources = (value: unknown): SearchSource[] | null => {
             continue;
         }
         url.hash = "";
-        if (seen.has(url.href)) {
+        if (options.deduplicate !== false && seen.has(url.href)) {
             continue;
         }
         seen.add(url.href);
         sources.push({
+            ...("sourceId" in item && typeof item.sourceId === "string" ? { sourceId: item.sourceId } : {}),
             title: "title" in item && typeof item.title === "string" ? item.title : url.hostname,
             url: url.href,
             hostname: url.hostname,
diff --git a/drizzle/migrations/20260927154018_topic-rename-leases/migration.sql b/drizzle/migrations/20260927154018_topic-rename-leases/migration.sql
new file mode 100644
index 0000000..8f1d119
--- /dev/null
+++ b/drizzle/migrations/20260927154018_topic-rename-leases/migration.sql
@@ -0,0 +1,5 @@
+ALTER TABLE "topics" ADD COLUMN "rename_attempt_id" text;
+--> statement-breakpoint
+ALTER TABLE "topics" ADD COLUMN "rename_expires_at" timestamp with time zone;
+--> statement-breakpoint
+ALTER TABLE "topics" ADD COLUMN "title_source" text DEFAULT 'manual' NOT NULL;
diff --git a/drizzle/migrations/20260927154018_topic-rename-leases/snapshot.json b/drizzle/migrations/20260927154018_topic-rename-leases/snapshot.json
new file mode 100644
index 0000000..c83ac98
--- /dev/null
+++ b/drizzle/migrations/20260927154018_topic-rename-leases/snapshot.json
@@ -0,0 +1,2795 @@
+{
+  "version": "8",
+  "dialect": "postgres",
+  "id": "b3cded16-fd02-4802-a148-6dbaa3e248b8",
+  "prevIds": [
+    "5d8d6933-f7ce-4ae6-8f9b-4bfb111b7cbe"
+  ],
+  "ddl": [
+    {
+      "values": [
+        "reasoning",
+        "text",
+        "tool-call",
+        "file"
+      ],
+      "name": "part_type",
+      "entityType": "enums",
+      "schema": "public"
+    },
+    {
+      "values": [
+        "user",
+        "assistant"
+      ],
+      "name": "role",
+      "entityType": "enums",
+      "schema": "public"
+    },
+    {
+      "values": [
+        "pending",
+        "completed",
+        "failed",
+        "cancelled"
+      ],
+      "name": "status",
+      "entityType": "enums",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "accounts",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "agents",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "attachments",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "embeddings",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "files",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "generations",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "message_parts",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "messages",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "models",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "providers",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "sessions",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "settings",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "tool_calls",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "topics",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "users",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "isRlsEnabled": false,
+      "name": "verifications",
+      "entityType": "tables",
+      "schema": "public"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "account_id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "provider_id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "user_id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "access_token",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "refresh_token",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "id_token",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "timestamp with time zone",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "access_token_expires_at",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "timestamp with time zone",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "refresh_token_expires_at",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "scope",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "password",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "timestamp with time zone",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": "now()",
+      "generated": null,
+      "identity": null,
+      "name": "created_at",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "timestamp with time zone",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "updated_at",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "user_id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "name",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "system_prompt",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "image_url",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": null,
+      "generated": null,
+      "identity": null,
+      "name": "default_model_id",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "jsonb",
+      "typeSchema": null,
+      "notNull": false,
+      "dimensions": 0,
+      "default": "'{}'",
+      "generated": null,
+      "identity": null,
+      "name": "config",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "timestamp with time zone",
+      "typeSchema": null,
+      "notNull": true,
+      "dimensions": 0,
+      "default": "now()",
+      "generated": null,
+      "identity": null,
+      "name": "created_at",
+      "entityType": "columns",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "type": "text",
+      "typeSchema": null,
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+      "table": "messages"
+    },
+    {
+      "nameExplicit": true,
+      "columns": [
+        {
+          "value": "provider_id",
+          "isExpression": false,
+          "asc": true,
+          "nullsFirst": false,
+          "opclass": null
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "with": "",
+      "method": "btree",
+      "concurrently": false,
+      "name": "models_providerId_idx",
+      "entityType": "indexes",
+      "schema": "public",
+      "table": "models"
+    },
+    {
+      "nameExplicit": true,
+      "columns": [
+        {
+          "value": "user_id",
+          "isExpression": false,
+          "asc": true,
+          "nullsFirst": false,
+          "opclass": null
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "with": "",
+      "method": "btree",
+      "concurrently": false,
+      "name": "models_userId_idx",
+      "entityType": "indexes",
+      "schema": "public",
+      "table": "models"
+    },
+    {
+      "nameExplicit": true,
+      "columns": [
+        {
+          "value": "user_id",
+          "isExpression": false,
+          "asc": true,
+          "nullsFirst": false,
+          "opclass": null
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "with": "",
+      "method": "btree",
+      "concurrently": false,
+      "name": "providers_userId_idx",
+      "entityType": "indexes",
+      "schema": "public",
+      "table": "providers"
+    },
+    {
+      "nameExplicit": true,
+      "columns": [
+        {
+          "value": "user_id",
+          "isExpression": false,
+          "asc": true,
+          "nullsFirst": false,
+          "opclass": null
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "with": "",
+      "method": "btree",
+      "concurrently": false,
+      "name": "sessions_userId_idx",
+      "entityType": "indexes",
+      "schema": "public",
+      "table": "sessions"
+    },
+    {
+      "nameExplicit": true,
+      "columns": [
+        {
+          "value": "user_id",
+          "isExpression": false,
+          "asc": true,
+          "nullsFirst": false,
+          "opclass": null
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "with": "",
+      "method": "btree",
+      "concurrently": false,
+      "name": "settings_userId_idx",
+      "entityType": "indexes",
+      "schema": "public",
+      "table": "settings"
+    },
+    {
+      "nameExplicit": true,
+      "columns": [
+        {
+          "value": "user_id",
+          "isExpression": false,
+          "asc": true,
+          "nullsFirst": false,
+          "opclass": null
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "with": "",
+      "method": "btree",
+      "concurrently": false,
+      "name": "tool_calls_userId_idx",
+      "entityType": "indexes",
+      "schema": "public",
+      "table": "tool_calls"
+    },
+    {
+      "nameExplicit": true,
+      "columns": [
+        {
+          "value": "agent_id",
+          "isExpression": false,
+          "asc": true,
+          "nullsFirst": false,
+          "opclass": null
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "with": "",
+      "method": "btree",
+      "concurrently": false,
+      "name": "topics_agentId_idx",
+      "entityType": "indexes",
+      "schema": "public",
+      "table": "topics"
+    },
+    {
+      "nameExplicit": true,
+      "columns": [
+        {
+          "value": "user_id",
+          "isExpression": false,
+          "asc": true,
+          "nullsFirst": false,
+          "opclass": null
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "with": "",
+      "method": "btree",
+      "concurrently": false,
+      "name": "topics_userId_idx",
+      "entityType": "indexes",
+      "schema": "public",
+      "table": "topics"
+    },
+    {
+      "nameExplicit": true,
+      "columns": [
+        {
+          "value": "identifier",
+          "isExpression": false,
+          "asc": true,
+          "nullsFirst": false,
+          "opclass": null
+        }
+      ],
+      "isUnique": false,
+      "where": null,
+      "with": "",
+      "method": "btree",
+      "concurrently": false,
+      "name": "verifications_identifier_idx",
+      "entityType": "indexes",
+      "schema": "public",
+      "table": "verifications"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "user_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "users",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "accounts_user_id_users_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "accounts"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "default_model_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "models",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "SET NULL",
+      "name": "agents_default_model_id_models_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "agents"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "topic_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "topics",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "attachments_topic_id_topics_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "attachments"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "message_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "messages",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "attachments_message_id_messages_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "attachments"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "file_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "files",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "attachments_file_id_files_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "attachments"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "file_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "files",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "embeddings_file_id_files_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "embeddings"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "topic_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "topics",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "generations_topic_id_topics_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "generations"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "topic_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "topics",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "message_parts_topic_id_topics_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "message_parts"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "message_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "messages",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "message_parts_message_id_messages_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "message_parts"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "tool_call_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "tool_calls",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "message_parts_tool_call_id_tool_calls_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "message_parts"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "topic_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "topics",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "messages_topic_id_topics_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "messages"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "generation_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "generations",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "messages_generation_id_generations_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "messages"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "provider_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "providers",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "models_provider_id_providers_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "models"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "user_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "users",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "sessions_user_id_users_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "sessions"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "agent_id"
+      ],
+      "schemaTo": "public",
+      "tableTo": "agents",
+      "columnsTo": [
+        "id"
+      ],
+      "onUpdate": "NO ACTION",
+      "onDelete": "CASCADE",
+      "name": "topics_agent_id_agents_id_fkey",
+      "entityType": "fks",
+      "schema": "public",
+      "table": "topics"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "accounts_pkey",
+      "schema": "public",
+      "table": "accounts",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "agents_pkey",
+      "schema": "public",
+      "table": "agents",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "attachments_pkey",
+      "schema": "public",
+      "table": "attachments",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "embeddings_pkey",
+      "schema": "public",
+      "table": "embeddings",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "files_pkey",
+      "schema": "public",
+      "table": "files",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "generations_pkey",
+      "schema": "public",
+      "table": "generations",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "message_parts_pkey",
+      "schema": "public",
+      "table": "message_parts",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "messages_pkey",
+      "schema": "public",
+      "table": "messages",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "models_pkey",
+      "schema": "public",
+      "table": "models",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "providers_pkey",
+      "schema": "public",
+      "table": "providers",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "sessions_pkey",
+      "schema": "public",
+      "table": "sessions",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "settings_pkey",
+      "schema": "public",
+      "table": "settings",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "tool_calls_pkey",
+      "schema": "public",
+      "table": "tool_calls",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "topics_pkey",
+      "schema": "public",
+      "table": "topics",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "users_pkey",
+      "schema": "public",
+      "table": "users",
+      "entityType": "pks"
+    },
+    {
+      "columns": [
+        "id"
+      ],
+      "nameExplicit": false,
+      "name": "verifications_pkey",
+      "schema": "public",
+      "table": "verifications",
+      "entityType": "pks"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "token"
+      ],
+      "nullsNotDistinct": false,
+      "name": "sessions_token_key",
+      "schema": "public",
+      "table": "sessions",
+      "entityType": "uniques"
+    },
+    {
+      "nameExplicit": false,
+      "columns": [
+        "email"
+      ],
+      "nullsNotDistinct": false,
+      "name": "users_email_key",
+      "schema": "public",
+      "table": "users",
+      "entityType": "uniques"
+    }
+  ],
+  "renames": []
+}
\ No newline at end of file
diff --git a/drizzle/schema.ts b/drizzle/schema.ts
index 7085d78..3682e22 100644
--- a/drizzle/schema.ts
+++ b/drizzle/schema.ts
@@ -122,6 +122,9 @@ export const topics = pgTable('topics', {
     agentId: text('agent_id').notNull().references(() => agents.id, { onDelete: 'cascade' }),
     name: text('name').notNull(),
     renaming: boolean('renaming').default(false),
+    renameAttemptId: text('rename_attempt_id'),
+    renameExpiresAt: timestamptz('rename_expires_at'),
+    titleSource: text('title_source').notNull().default('manual'),
     createdAt: timestamptz('created_at').notNull().defaultNow(),
 }, (table) => [
     index('topics_agentId_idx').on(table.agentId),
diff --git a/server/api/agents.get.ts b/server/api/agents.get.ts
index 403841b..3b787fa 100644
--- a/server/api/agents.get.ts
+++ b/server/api/agents.get.ts
@@ -1,9 +1,22 @@
+import { and, eq, isNull, lte, or } from "drizzle-orm";
+import { topics } from "~~/drizzle/schema";
 import { db } from "~~/server/lib/db";
 
 export default defineEventHandler(async (event) => {
     await protectRoute(event);
     const userId = event.context.user!.id as string;
 
+    // Expired leases also recover jobs interrupted by a server restart.
+    await db.update(topics).set({
+        renaming: false,
+        renameAttemptId: null,
+        renameExpiresAt: null,
+    }).where(and(
+        eq(topics.userId, userId),
+        eq(topics.renaming, true),
+        or(isNull(topics.renameExpiresAt), lte(topics.renameExpiresAt, new Date())),
+    ));
+
     const agents = await db.query.agents.findMany({
         where: {
             userId,
diff --git a/server/api/messages/[messageId]/index.delete.ts b/server/api/messages/[messageId]/index.delete.ts
index 3cf041d..d176a1e 100644
--- a/server/api/messages/[messageId]/index.delete.ts
+++ b/server/api/messages/[messageId]/index.delete.ts
@@ -63,62 +63,106 @@ export default defineEventHandler(async (event) => {
         }
     }
 
-    const rootMessage = messagesMap.get(messageId);
-    if (!rootMessage) {
+    const targetMessage = messagesMap.get(messageId);
+    if (!targetMessage) {
         throw createError({
             statusCode: 400,
             statusMessage: 'Invalid message',
         });
     }
 
-    if (rootMessage.role === 'user') {
-        await deeplyDeleteMessage(rootMessage.id, topicId, userId);
+    if (targetMessage.role === 'user') {
+        await deeplyDeleteMessage(targetMessage.id, topicId, userId);
         return { ok: true };
     }
 
-    if (rootMessage.deleted === true) {
-        const childMessage = rootMessage.activeChildId
-            ? rootMessage.children.find(c => c.id === rootMessage.activeChildId)
-            : rootMessage.children[0];
-        if (!childMessage) {
-            console.error('Message not found');
-            return { ok: false };
+    if (targetMessage.parentMessageId && messagesMap.has(targetMessage.parentMessageId)) {
+        const parent = messagesMap.get(targetMessage.parentMessageId)!;
+        await deeplyDeleteMessage(targetMessage.id, topicId, userId);
+
+        const remainingChildren = parent.children.filter((child) => {
+            return child.id !== targetMessage.id;
+        });
+
+        if (parent.deleted === true && remainingChildren.length === 0) {
+            await deeplyDeleteMessage(parent.id, topicId, userId);
+        } else if (parent.activeChildId === targetMessage.id) {
+            const nextActiveChildId = remainingChildren.length > 0
+                ? (parent.deleted ? remainingChildren[0]!.id : remainingChildren[remainingChildren.length - 1]!.id)
+                : null;
+            await db.update(messages).set({ activeChildId: nextActiveChildId }).where(sql`${messages.id} = ${parent.id} AND ${messages.userId} = ${userId}`);
+            topicEvents.emit(topicId, {
+                type: 'MESSAGE_UPDATED',
+                payload: { ...parent, activeChildId: nextActiveChildId },
+            });
         }
+        return { ok: true };
+    }
 
-        await deeplyDeleteMessage(childMessage.id, topicId, userId);
+    if (targetMessage.deleted === true) {
+        const childMessage = targetMessage.activeChildId
+            ? targetMessage.children.find((c) => { return c.id === targetMessage.activeChildId; })
+            : targetMessage.children[0];
 
-        const remainingChildren = rootMessage.children.filter(child => child!.id !== childMessage.id);
-        if (remainingChildren.length === 0) {
-            await deeplyDeleteMessage(rootMessage.id, topicId, userId);
+        if (childMessage) {
+            await deeplyDeleteMessage(childMessage.id, topicId, userId);
+            const remainingChildren = targetMessage.children.filter((child) => {
+                return child.id !== childMessage.id;
+            });
+            if (remainingChildren.length === 0) {
+                await deeplyDeleteMessage(targetMessage.id, topicId, userId);
+            } else if (targetMessage.activeChildId === childMessage.id) {
+                const nextActiveChildId = remainingChildren[0]!.id;
+                await db.update(messages).set({ activeChildId: nextActiveChildId }).where(sql`${messages.id} = ${targetMessage.id} AND ${messages.userId} = ${userId}`);
+                topicEvents.emit(topicId, {
+                    type: 'MESSAGE_UPDATED',
+                    payload: { ...targetMessage, activeChildId: nextActiveChildId },
+                });
+            }
+        } else {
+            await deeplyDeleteMessage(targetMessage.id, topicId, userId);
         }
         return { ok: true };
     }
 
     if (
-        rootMessage.activeChildId
-        && rootMessage.children.length > 0
+        targetMessage.activeChildId
+        && targetMessage.children.length > 0
     ) {
-        const childMessage = rootMessage.children.find(c => c.id === rootMessage.activeChildId);
-        if (!childMessage) {
-            console.error('Message not found');
-            return { ok: false };
+        const childMessage = targetMessage.children.find((c) => {
+            return c.id === targetMessage.activeChildId;
+        });
+        if (childMessage) {
+            await deeplyDeleteMessage(childMessage.id, topicId, userId);
+            const remainingChildren = targetMessage.children.filter((child) => {
+                return child.id !== childMessage.id;
+            });
+            const nextActiveChildId = remainingChildren.length > 0
+                ? remainingChildren[remainingChildren.length - 1]!.id
+                : null;
+            await db.update(messages).set({ activeChildId: nextActiveChildId }).where(sql`${messages.id} = ${targetMessage.id} AND ${messages.userId} = ${userId}`);
+            topicEvents.emit(topicId, {
+                type: 'MESSAGE_UPDATED',
+                payload: { ...targetMessage, activeChildId: nextActiveChildId },
+            });
+            return { ok: true };
         }
+    }
 
-        await deeplyDeleteMessage(childMessage.id, topicId, userId);
-
+    if (targetMessage.children.length === 0) {
+        await deeplyDeleteMessage(targetMessage.id, topicId, userId);
         return { ok: true };
     }
 
-    if (rootMessage.children.length === 0) {
-        await deeplyDeleteMessage(rootMessage.id, topicId, userId);
-        return { ok: true };
-    }
-
-    await db.update(messages).set({ deleted: true }).where(sql`${messages.id} = ${rootMessage.id} AND ${messages.userId} = ${userId}`);
+    const nextActiveChildId = targetMessage.children[0]?.id ?? null;
+    await db.update(messages).set({
+        deleted: true,
+        activeChildId: nextActiveChildId,
+    }).where(sql`${messages.id} = ${targetMessage.id} AND ${messages.userId} = ${userId}`);
 
     topicEvents.emit(topicId, {
         type: 'MESSAGE_UPDATED',
-        payload: { ...rootMessage, deleted: true },
+        payload: { ...targetMessage, deleted: true, activeChildId: nextActiveChildId },
     });
 
     return { ok: true };
diff --git a/server/api/topic/[topicId]/auto-rename/cancel.post.ts b/server/api/topic/[topicId]/auto-rename/cancel.post.ts
index 45ac2e9..973dd98 100644
--- a/server/api/topic/[topicId]/auto-rename/cancel.post.ts
+++ b/server/api/topic/[topicId]/auto-rename/cancel.post.ts
@@ -1,44 +1,39 @@
-import { and, eq } from 'drizzle-orm';
-import { topics } from '~~/drizzle/schema';
-import { db } from '~~/server/lib/db';
-import { cancelPendingRename } from '~~/server/utils/renames';
-import { userEvents } from '~~/server/utils/events';
+import { and, eq, isNull } from "drizzle-orm";
+import { topics } from "~~/drizzle/schema";
+import { db } from "~~/server/lib/db";
+import { cancelPendingRename } from "~~/server/utils/renames";
+import { topicEvents, userEvents } from "~~/server/utils/events";
 
 export default defineEventHandler(async (event) => {
     await protectRoute(event);
-
-    const topicId = getRouterParam(event, 'topicId')!;
-
-    const success = cancelPendingRename(topicId);
-    if (success) {
-        const res = await db.update(topics).set({
-            renaming: false,
-        }).where(and(eq(topics.id, topicId), eq(topics.userId, event.context.user!.id)));
-        if (res.rowCount === 0) {
-            throw createError({
-                statusCode: 400,
-                statusMessage: 'Invalid topic',
-                data: {
-                    code: 'INVALID_TOPIC',
-                    ok: false,
-                }
-            });
-        }
-
-        userEvents.emit(topicId, 'topics', {
-            op: 'update',
-            payload: {
-                topicId,
-                renaming: false,
-            },
-        });
-
-        return {
-            ok: true,
-        };
+    const topicId = getRouterParam(event, "topicId");
+    const userId = event.context.user?.id;
+    if (!topicId || !userId) {
+        setResponseStatus(event, 400);
+        return { ok: false };
     }
 
-    return {
-        ok: false,
-    };
-});
\ No newline at end of file
+    const topic = await db.query.topics.findFirst({ where: { id: topicId, userId } });
+    if (!topic) {
+        setResponseStatus(event, 404);
+        return { ok: false };
+    }
+    const cleared = await db.update(topics).set({
+        renaming: false,
+        renameAttemptId: null,
+        renameExpiresAt: null,
+    }).where(and(
+        eq(topics.id, topicId),
+        eq(topics.userId, userId),
+        topic.renameAttemptId ? eq(topics.renameAttemptId, topic.renameAttemptId) : isNull(topics.renameAttemptId),
+    )).returning({ id: topics.id });
+    if (cleared.length === 0) {
+        return { ok: false };
+    }
+    cancelPendingRename(topicId, topic.renameAttemptId);
+
+    const payload = { topicId, renaming: false };
+    userEvents.emit(userId, "topics", { op: "update", payload });
+    topicEvents.emit(topicId, { type: "topic_updated", payload });
+    return { ok: true };
+});
diff --git a/server/api/topic/[topicId]/auto-rename/index.post.ts b/server/api/topic/[topicId]/auto-rename/index.post.ts
index d3f7e7c..a2aa5c9 100644
--- a/server/api/topic/[topicId]/auto-rename/index.post.ts
+++ b/server/api/topic/[topicId]/auto-rename/index.post.ts
@@ -1,13 +1,16 @@
 import * as z from 'zod';
 import { renamePrompt } from '~~/prompts';
-import { generateText } from 'ai';
+import { generateText, type UserContent } from "ai";
+import { nanoid } from "nanoid";
+import { resolveFileUrl } from "~~/utils/url";
+import { generateFileToken } from "~~/server/utils/file-token";
 import { GatewayFetchError, getProviderDetails, type ModelGateway } from '~~/server/utils/ai-provider';
-import { addPendingRename } from '~~/server/utils/renames';
+import { addPendingRename, completeRename } from "~~/server/utils/renames";
 import { userEvents } from '~~/server/utils/events';
 import { db } from '~~/server/lib/db';
 import { type Model } from '~/composables/useModels';
 import { topics } from '~~/drizzle/schema';
-import { eq } from 'drizzle-orm';
+import { and, eq, gt, isNull, lte, or } from "drizzle-orm";
 
 export default defineEventHandler(async (event) => {
     await protectRoute(event);
@@ -94,7 +97,7 @@ export default defineEventHandler(async (event) => {
         });
     }
 
-    if (topic.renaming) {
+    if (topic.renaming && topic.renameExpiresAt && topic.renameExpiresAt > new Date()) {
         throw createError({
             statusCode: 400,
             statusMessage: 'Already renaming',
@@ -165,47 +168,70 @@ export default defineEventHandler(async (event) => {
         });
     }
 
-    let prompt = firstMessage.content!;
-
-    if (firstMessage.attachments.length > 0) {
-        for (const attachment of firstMessage.attachments) {
-            if (attachment.file.mimeType.startsWith('image/')) {
-                prompt += `\n![${attachment.file.name}](${attachment.file.url})`;
+    const content: UserContent = [{
+        type: "text",
+        text: [firstMessage.content || "Describe the attached content.",
+            ...firstMessage.attachments.map(({ file }) => `Attachment: ${file.name}`),
+        ].join("\n").slice(0, 12000),
+    }];
+    if (model.inputModalities.includes("image")) {
+        const images = firstMessage.attachments.filter(({ file }) =>
+            file.mimeType.startsWith("image/") && file.size <= 10 * 1024 * 1024,
+        ).slice(0, 2);
+        for (const { file } of images) {
+            const url = new URL(resolveFileUrl(file.url));
+            if (file.url.startsWith("/api/files/")) {
+                const secret = process.env.BETTER_AUTH_SECRET;
+                if (!secret) {
+                    continue;
+                }
+                const { exp, sig } = generateFileToken(file.url.slice("/api/files/".length), secret);
+                url.searchParams.set("exp", String(exp));
+                url.searchParams.set("sig", sig);
             }
+            content.push({ type: "image", image: url, mediaType: file.mimeType });
         }
     }
 
-    const abortController = addPendingRename(topicId);
-    event.waitUntil(autoRename(topicId, abortController, { gateway: gateway.gateway, model }, gateway.textTransformer, prompt, userId));
+    const attemptId = nanoid();
+    const claimed = await db.update(topics).set({
+        renaming: true,
+        renameAttemptId: attemptId,
+        renameExpiresAt: new Date(Date.now() + 90000),
+    }).where(and(
+        eq(topics.id, topicId),
+        eq(topics.userId, userId),
+        eq(topics.name, topic.name),
+        or(eq(topics.renaming, false), isNull(topics.renameExpiresAt), lte(topics.renameExpiresAt, new Date())),
+    )).returning({ id: topics.id });
+    if (claimed.length === 0) {
+        return { ok: false as const, code: "ALREADY_RENAMING" };
+    }
+    userEvents.emit(userId, "topics", {
+        op: "update", payload: { topicId, renaming: true },
+    });
+    const abortController = addPendingRename(topicId, attemptId);
+    event.waitUntil(autoRename(topicId, attemptId, abortController, { gateway: gateway.gateway, model }, gateway.textTransformer, content, userId));
 
     return {
-        ok: true,
+        ok: true as const,
     };
 });
 
 const autoRename = async (
     topicId: string,
+    attemptId: string,
     abortController: AbortController,
     model: {
         gateway: ModelGateway,
         model: Model,
     },
     textTransformer: ((text: string) => string) | ((text: string) => string)[] | undefined,
-    prompt: string,
+    content: UserContent,
     userId: string,
 ) => {
+    const deadline = setTimeout(() => abortController.abort(), 90000);
     try {
-        await db.update(topics).set({
-            renaming: true,
-        }).where(eq(topics.id, topicId));
-        userEvents.emit(model.model.userId, 'topics', {
-            op: 'update',
-            payload: {
-                topicId,
-                renaming: true,
-            },
-        });
-
         const response = await generateText({
             model: model.gateway(model.model.externalId),
             providerOptions: {
@@ -214,10 +240,11 @@ const autoRename = async (
                 }
             },
             system: renamePrompt,
-            prompt,
+            messages: [{ role: "user", content }],
+            maxRetries: 0,
             timeout: 90 * 1000,
             abortSignal: abortController.signal,
-        })
+        });
 
         let text = response.text;
 
@@ -231,15 +258,30 @@ const autoRename = async (
             }
         }
 
-        await db.update(topics).set({
+        text = text.trim().replace(/^['"]|['"]$/g, "").split("\n")[0]?.trim().slice(0, 120) || "";
+        if (!text || abortController.signal.aborted) {
+            return;
+        }
+        const updated = await db.update(topics).set({
             renaming: false,
+            renameAttemptId: null,
+            renameExpiresAt: null,
+            titleSource: "generated",
             name: text,
-        }).where(eq(topics.id, topicId));
+        }).where(and(
+            eq(topics.id, topicId),
+            eq(topics.renameAttemptId, attemptId),
+            gt(topics.renameExpiresAt, new Date()),
+        )).returning({ id: topics.id });
+        if (updated.length === 0) {
+            return;
+        }
         userEvents.emit(model.model.userId, 'topics', {
             op: 'update',
             payload: {
                 topicId,
                 name: text,
+                titleSource: "generated",
                 renaming: false,
             },
         });
@@ -248,29 +290,26 @@ const autoRename = async (
             payload: {
                 topicId,
                 name: text,
+                titleSource: "generated",
                 renaming: false,
             },
         });
     } catch (error) {
-        console.error('Failed to auto-rename:', error);
-        await db.update(topics).set({
-            renaming: false,
-        }).where(eq(topics.id, topicId));
-        userEvents.emit(model.model.userId, 'topics', {
-            op: 'update',
-            payload: {
-                topicId,
-                renaming: false,
-            },
-        });
-        topicEvents.emit(topicId, {
-            type: 'topic_updated',
-            payload: {
-                topicId,
-                renaming: false,
-            },
-        });
+        if (!abortController.signal.aborted) {
+            console.error("Failed to auto-rename:", error);
+        }
     } finally {
-        completeRename(topicId);
+        clearTimeout(deadline);
+        completeRename(topicId, attemptId);
+        const cleared = await db.update(topics).set({
+            renaming: false,
+            renameAttemptId: null,
+            renameExpiresAt: null,
+        }).where(and(eq(topics.id, topicId), eq(topics.renameAttemptId, attemptId))).returning({ id: topics.id });
+        if (cleared.length > 0) {
+            const payload = { topicId, renaming: false };
+            userEvents.emit(userId, "topics", { op: "update", payload });
+            topicEvents.emit(topicId, { type: "topic_updated", payload });
+        }
     }
 }
diff --git a/server/api/topic/[topicId]/chat/index.post.ts b/server/api/topic/[topicId]/chat/index.post.ts
index 5854138..aa71104 100644
--- a/server/api/topic/[topicId]/chat/index.post.ts
+++ b/server/api/topic/[topicId]/chat/index.post.ts
@@ -433,7 +433,21 @@ async function generateResponse(
 
     if (search) {
         tools.search = tool({
-            description: 'Searches the web. Choose how many results to return on every call using the required results argument.',
+            description: `Searches the web. Choose how many results to return on every call using the required results argument.
+
+CITATION FORMAT:
+Every result includes a sourceId. Cite supporting results immediately after the claim using this exact construction:
+"[[cite:" + the result's sourceId + "]]"
+The prefix "cite:" is mandatory literal text. Copy the sourceId unchanged after that prefix. Do not output the word "sourceId" as a placeholder.
+
+Example: if a result has sourceId "sd625ebbd4d3544e4914f5a51840d7632":
+CORRECT: The report describes rising prices. [[cite:sd625ebbd4d3544e4914f5a51840d7632]]
+INCORRECT: The report describes rising prices. [[sd625ebbd4d3544e4914f5a51840d7632]]
+The incorrect form is missing "cite:" and will not render as a citation.
+
+For multiple sources, put their exact IDs after a single "cite:" prefix, separated by commas without spaces: [[cite:ID_FROM_FIRST_RESULT,ID_FROM_SECOND_RESULT]]. Replace both placeholders with returned sourceId values. Separate complete citations are also valid: [[cite:ID_FROM_FIRST_RESULT]] [[cite:ID_FROM_SECOND_RESULT]].
+Use only IDs returned by searches during this response; never invent IDs or copy the example ID unless it actually appears in a result. Write citation markers directly in answer text, not inside backticks or code blocks. Do not repeat URLs or add footnote definitions for these citations.
+Search snippets are excerpts, not full-page reads.`,
             inputSchema: searchInputSchema,
             outputSchema: searchOutputSchema,
             execute: async ({ query, results }) => {
@@ -652,6 +666,7 @@ async function generateResponse(
                                 partId: part.id,
                                 lastUpdatedAt: new Date(),
                                 content: token.text,
+                                offset: part.accumulatedContent.length - token.text.length,
                             }
                         })
                     }
@@ -1244,7 +1259,8 @@ async function generateResponse(
             }
         })
     } finally {
+        topicEvents.clearLiveText(topicId, message.id);
         completeGeneration(generationId);
         if (logFile !== undefined) logFile.close();
     }
-}
\ No newline at end of file
+}
diff --git a/server/api/topic/[topicId]/index.get.ts b/server/api/topic/[topicId]/index.get.ts
index 4de923e..4f54de9 100644
--- a/server/api/topic/[topicId]/index.get.ts
+++ b/server/api/topic/[topicId]/index.get.ts
@@ -1,95 +1,60 @@
-import { db } from "~~/server/lib/db";
-import { topicEvents } from "~~/server/utils/events";
+import { db } from '~~/server/lib/db';
+import { topicEvents } from '~~/server/utils/events';
+import { createTopicSnapshotStream } from '~~/server/utils/topic-snapshot-stream';
 
 export default defineEventHandler(async (event) => {
     await protectRoute(event);
 
     const topicId = getRouterParam(event, 'topicId')!;
-    const isSSE = getHeader(event, 'accept')?.includes('text/event-stream') ?? false;
-
     const userId = event.context.user!.id as string;
-
-    const topic = await db.query.topics.findFirst({
-        where: {
-            id: topicId,
-            userId,
-        },
+    const isSSE = getHeader(event, 'accept')?.includes('text/event-stream') ?? false;
+    const readTopic = () => db.query.topics.findFirst({
+        where: { id: topicId, userId },
         with: {
             messages: {
-                orderBy: {
-                    createdAt: 'asc',
-                },
+                orderBy: { createdAt: 'asc' },
                 with: {
                     parts: {
-                        orderBy: {
-                            createdAt: 'asc',
-                        },
-                        with: {
-                            toolCall: true,
-                        }
-                    },
-                    attachments: {
-                        with: {
-                            file: true,
-                        }
+                        orderBy: { createdAt: 'asc' },
+                        with: { toolCall: true },
                     },
+                    attachments: { with: { file: true } },
                     generation: true,
-                }
+                },
             },
         },
     });
 
-    if (!topic) {
-        console.log("topic not found");
-        throw createError({
-            statusCode: 404,
-            statusMessage: 'Not Found',
-        });
-    }
-
-    if (isSSE === false) {
+    if (!isSSE) {
+        const topic = await readTopic();
+        if (!topic) {
+            setResponseStatus(event, 404);
+            return { ok: false, error: 'Topic not found' };
+        }
+        topicEvents.applyLiveText(topicId, topic.messages);
         return topic;
     }
 
+    // Authorize before subscribing; no topic data is exposed before this check.
+    const ownedTopic = await db.query.topics.findFirst({
+        where: { id: topicId, userId },
+        columns: { id: true },
+    });
+    if (!ownedTopic) {
+        setResponseStatus(event, 404);
+        return { ok: false, error: 'Topic not found' };
+    }
+
+    const subscription = createTopicSnapshotStream(topicId, getQuery(event).snapshot);
+    event.node.res.once('close', subscription.close);
+    const stream = await subscription.open(readTopic);
+    if (!stream.ok) {
+        setResponseStatus(event, stream.error === 'read-failed' ? 500 : 404);
+        return { ok: false, error: stream.error };
+    }
     setHeader(event, 'Content-Type', 'text/event-stream');
     setHeader(event, 'Cache-Control', 'no-cache');
-    setHeader(event, 'Connection', 'keep-alive');
+    setHeader(event, 'X-Accel-Buffering', 'no');
 
-    const { lastUpdate, count } = getQuery(event);
-    const serverLastUpdate = topic.messages.at(-1)?.updatedAt;
-    const serverCount = topic.messages.length;
-
-    // TODO: there is potentially a race condition here where the client could 
-    // connect at milisecond 87, and the last database write was at 0 (there
-    // is a write every 100ms for some operations), if there were tokens sent
-    // at 20 40 and 60, those tokens are lost to the client.
-    let streamController: ReadableStreamDefaultController;
-    let interval: NodeJS.Timeout;
-    const stream = new ReadableStream({
-        start(controller) {
-            streamController = controller;
-            controller.enqueue(`:connected\n\n`);
-
-            if ((lastUpdate && count) && (lastUpdate === serverLastUpdate?.toISOString() && count === serverCount)) {
-                controller.enqueue(':already_synced\n\n')
-            } else {
-                controller.enqueue(`data: ${JSON.stringify({
-                    type: 'initial_state',
-                    payload: topic
-                })}\n\n`);
-            }
-
-            interval = setInterval(() => {
-                controller.enqueue(`:heartbeat\n\n`);
-            }, 15000);
-
-            topicEvents.subscribe(topicId, streamController);
-        },
-        cancel() {
-            topicEvents.unsubscribe(topicId, streamController);
-            clearInterval(interval);
-        }
-    });
-
-    return sendStream(event, stream);
+    return sendStream(event, stream.data);
 });
diff --git a/server/api/topic/[topicId]/index.patch.ts b/server/api/topic/[topicId]/index.patch.ts
index 100036d..4b758cd 100644
--- a/server/api/topic/[topicId]/index.patch.ts
+++ b/server/api/topic/[topicId]/index.patch.ts
@@ -29,6 +29,12 @@ export default defineEventHandler(async (event) => {
     const res = await db.update(topics)
         .set({
             name,
+            ...(name === undefined ? {} : {
+                titleSource: "manual",
+                renaming: false,
+                renameAttemptId: null,
+                renameExpiresAt: null,
+            }),
         })
         .where(
             and(
diff --git a/server/api/topic/index.post.ts b/server/api/topic/index.post.ts
index f980f39..1e239f1 100644
--- a/server/api/topic/index.post.ts
+++ b/server/api/topic/index.post.ts
@@ -30,6 +30,7 @@ export default defineEventHandler(async (event) => {
         id,
         userId,
         name,
+        titleSource: "provisional",
         agentId,
         createdAt: new Date(),
     });
diff --git a/server/utils/events.ts b/server/utils/events.ts
index 664069a..d10f130 100644
--- a/server/utils/events.ts
+++ b/server/utils/events.ts
@@ -1,5 +1,9 @@
+import { createLiveTopicText } from './live-topic-text';
+
+type StreamSink = Pick<ReadableStreamDefaultController, 'enqueue'>;
+
 interface StreamConnection {
-    controller: ReadableStreamDefaultController;
+    controller: StreamSink;
     lastPing: number;
     subscribedAt: number;
 }
@@ -91,9 +95,13 @@ export const userEvents = {
 };
 
 const topicSubscribers = new Map<string, Set<StreamConnection>>();
+const liveTopicText = createLiveTopicText();
 
 export const topicEvents = {
-    subscribe(topicId: string, controller: ReadableStreamDefaultController) {
+    applyLiveText: liveTopicText.apply,
+    clearLiveText: liveTopicText.removeMessage,
+
+    subscribe(topicId: string, controller: StreamSink) {
         if (!topicSubscribers.has(topicId)) {
             topicSubscribers.set(topicId, new Set());
         }
@@ -120,7 +128,7 @@ export const topicEvents = {
         (conn as any).pingInterval = pingInterval;
     },
 
-    unsubscribe(topicId: string, controller: ReadableStreamDefaultController) {
+    unsubscribe(topicId: string, controller: StreamSink) {
         const connections = topicSubscribers.get(topicId);
         if (!connections) return;
 
@@ -137,14 +145,14 @@ export const topicEvents = {
     },
 
     async emit(topicId: string, events: Array<{ type: string; payload: any; timestamp?: number }> | { type: string; payload: any; timestamp?: number }) {
-        const connections = topicSubscribers.get(topicId);
-        if (!connections || connections.size === 0) return;
-
         if (!Array.isArray(events)) {
             events = [events];
         }
 
         for (const event of events) {
+            liveTopicText.update(topicId, event);
+            const connections = topicSubscribers.get(topicId);
+            if (!connections || connections.size === 0) continue;
             const timestamp = event.timestamp ?? Date.now();
             const data = `data: ${JSON.stringify({ ...event, timestamp })}\n\n`;
 
diff --git a/server/utils/live-topic-text.ts b/server/utils/live-topic-text.ts
new file mode 100644
index 0000000..69b3b31
--- /dev/null
+++ b/server/utils/live-topic-text.ts
@@ -0,0 +1,65 @@
+import { appendTextDelta } from '../../utils/topic-sync';
+
+interface LivePart {
+    messageId: string;
+    part: Record<string, any> & { id: string; content: string };
+}
+
+/** Covers the interval between an emitted delta and its throttled DB write. */
+export const createLiveTopicText = () => {
+    const topics = new Map<string, Map<string, LivePart>>();
+
+    const removeMessage = (topicId: string, messageId: string) => {
+        const parts = topics.get(topicId);
+        if (!parts) return;
+        for (const [id, entry] of parts) {
+            if (entry.messageId === messageId) parts.delete(id);
+        }
+        if (parts.size === 0) topics.delete(topicId);
+    };
+
+    return {
+        update(topicId: string, event: { type: string; payload: any }) {
+            const { type, payload } = event;
+            if (type === 'text-start') {
+                let parts = topics.get(topicId);
+                if (!parts) topics.set(topicId, parts = new Map());
+                parts.set(payload.part.id, {
+                    messageId: payload.messageId,
+                    part: { ...payload.part, toolCall: null, content: payload.part.content ?? '' },
+                });
+            } else if (type === 'text-delta') {
+                const entry = topics.get(topicId)?.get(payload.partId);
+                if (entry) {
+                    entry.part.content = appendTextDelta(entry.part.content, payload.content, payload.offset);
+                    entry.part.lastUpdatedAt = payload.lastUpdatedAt;
+                }
+            } else if (type === 'text-end' || type === 'text-delete') {
+                const parts = topics.get(topicId);
+                parts?.delete(payload.partId);
+                if (parts?.size === 0) topics.delete(topicId);
+            } else if (type === 'MESSAGE_DELETED') {
+                removeMessage(topicId, payload.id);
+            }
+        },
+        apply(topicId: string, messages: { id: string; parts: any[] }[]) {
+            const parts = topics.get(topicId);
+            if (!parts) return;
+            const byId = new Map(messages.map(message => [message.id, message]));
+            for (const entry of parts.values()) {
+                const message = byId.get(entry.messageId);
+                if (!message) continue;
+                const existing = message.parts.find(part => part.id === entry.part.id);
+                if (existing) {
+                    if (!existing.finished && (existing.content?.length ?? 0) <= entry.part.content.length) {
+                        existing.content = entry.part.content;
+                        existing.lastUpdatedAt = entry.part.lastUpdatedAt;
+                    }
+                } else {
+                    message.parts.push({ ...entry.part });
+                }
+            }
+        },
+        removeMessage,
+    };
+};
diff --git a/server/utils/renames.ts b/server/utils/renames.ts
index 7aedb90..2dd5003 100644
--- a/server/utils/renames.ts
+++ b/server/utils/renames.ts
@@ -1,31 +1,21 @@
-interface PendingRename {
-    topicId: string;
-    abortController: AbortController;
-}
+const pendingRenames = new Map<string, { attemptId: string; controller: AbortController }>();
 
-const pendingRenames: Map<string, AbortController> = new Map();
-
-export const cancelPendingRename = (topicId: string) => {
-    const pendingRename = pendingRenames.get(topicId);
-    if (pendingRename) {
-        pendingRename.abort();
-        pendingRenames.delete(topicId);
-        return true;
-    }
-
-    return false;
-};
-
-export const completeRename = (topicId: string) => {
-    const controller = pendingRenames.get(topicId);
-    if (controller) {
+export const cancelPendingRename = (topicId: string, attemptId?: string | null) => {
+    const pending = pendingRenames.get(topicId);
+    if (pending && pending.attemptId === attemptId) {
+        pending.controller.abort();
         pendingRenames.delete(topicId);
     }
 };
 
-export const addPendingRename = (topicId: string) => {
-    const abortController = new AbortController();
+export const completeRename = (topicId: string, attemptId: string) => {
+    if (pendingRenames.get(topicId)?.attemptId === attemptId) {
+        pendingRenames.delete(topicId);
+    }
+};
 
-    pendingRenames.set(topicId, abortController);
-    return abortController;
-};
\ No newline at end of file
+export const addPendingRename = (topicId: string, attemptId: string) => {
+    const controller = new AbortController();
+    pendingRenames.set(topicId, { attemptId, controller });
+    return controller;
+};
diff --git a/server/utils/search.ts b/server/utils/search.ts
index e104575..d883523 100644
--- a/server/utils/search.ts
+++ b/server/utils/search.ts
@@ -1,4 +1,5 @@
 import type { Result } from "../../types/result";
+import { randomUUID } from "node:crypto";
 import { z } from "zod";
 import { Err, Ok } from "../../types/result";
 
@@ -20,6 +21,7 @@ export const searchOutputSchema = z.object({
     results: z.array(z.object({
         title: z.string(),
         link: z.string(),
+        sourceId: z.string().describe('Copy this exact ID into [[cite:ID]]. The literal "cite:" prefix is required; [[ID]] is invalid.').optional(),
         snippet: z.string(),
     })),
     warnings: z.array(z.object({ engine: z.string(), reason: z.string() })),
@@ -43,6 +45,7 @@ export const readSearchResponse = (body: unknown): Result<SearchOutput, string>
     }
     return Ok({
         results: parsed.data.results.map(item => ({
+            sourceId: `s${randomUUID().replaceAll("-", "")}`,
             title: item.title,
             link: item.url,
             snippet: item.content,
diff --git a/server/utils/topic-snapshot-stream.ts b/server/utils/topic-snapshot-stream.ts
new file mode 100644
index 0000000..646c16c
--- /dev/null
+++ b/server/utils/topic-snapshot-stream.ts
@@ -0,0 +1,70 @@
+import { createHash } from 'node:crypto';
+import { Err, Ok } from '../../types/result';
+import { serializeTopicSnapshot } from '../../utils/topic-sync';
+import { topicEvents } from './events';
+
+interface TopicSnapshot {
+    messages: { id: string; parts: any[] }[];
+}
+
+export const createTopicSnapshotStream = (topicId: string, offeredFingerprint: unknown) => {
+    let controller: ReadableStreamDefaultController | undefined;
+    let closed = false;
+    const buffered: string[] = [];
+    const sink = {
+        enqueue(frame: string) {
+            if (closed) return;
+            if (controller) controller.enqueue(frame);
+            else buffered.push(frame);
+        },
+    };
+    const close = () => {
+        closed = true;
+        topicEvents.unsubscribe(topicId, sink);
+        buffered.length = 0;
+    };
+
+    return {
+        close,
+        async open(readSnapshot: () => Promise<TopicSnapshot | undefined>) {
+            if (closed) return Err('closed' as const);
+            // Subscribe before reading: changes during the query must not be lost.
+            topicEvents.subscribe(topicId, sink);
+            let topic;
+            try {
+                topic = await readSnapshot();
+            } catch (error) {
+                close();
+                console.error('Failed to read topic snapshot', error);
+                return Err('read-failed' as const);
+            }
+            if (closed || !topic) {
+                close();
+                return Err('not-found' as const);
+            }
+            // Include deltas already emitted but not yet flushed to PostgreSQL.
+            topicEvents.applyLiveText(topicId, topic.messages);
+            const fingerprint = createHash('sha256').update(serializeTopicSnapshot(topic)).digest('hex');
+            const matches = offeredFingerprint === fingerprint;
+
+            return Ok(new ReadableStream<string>({
+                start(streamController) {
+                    controller = streamController;
+                    controller.enqueue(`data: ${JSON.stringify(matches
+                        ? { type: 'synced', payload: { id: topicId } }
+                        : { type: 'initial_state', payload: topic })}\n\n`);
+                    for (const frame of buffered) {
+                        if (frame.startsWith('data: ')) {
+                            const replay = { ...JSON.parse(frame.slice(6)), replay: true };
+                            controller.enqueue(`data: ${JSON.stringify(replay)}\n\n`);
+                        } else {
+                            controller.enqueue(frame);
+                        }
+                    }
+                    buffered.length = 0;
+                },
+                cancel: close,
+            }));
+        },
+    };
+};
diff --git a/tests/citations.test.ts b/tests/citations.test.ts
new file mode 100644
index 0000000..f25f7ea
--- /dev/null
+++ b/tests/citations.test.ts
@@ -0,0 +1,84 @@
+import { describe, expect, test } from "bun:test";
+import { collectCitationSources } from "../app/utils/citations";
+import { createMarkdownParser, getNodeChildren, getNodeTag } from "../app/utils/markdown";
+import type { MarkdownAstNode } from "../app/utils/markdown";
+import { readSearchResponse } from "../server/utils/search";
+
+const citations = (nodes: MarkdownAstNode[]): MarkdownAstNode[] => nodes.flatMap(node =>
+    getNodeTag(node) === "source-cite" ? [node] : citations(getNodeChildren(node)),
+);
+
+describe("citation parsing", () => {
+    test("keeps citation markers as text unless explicitly enabled", async () => {
+        const content = "Claim [[cite:1234]] and [[cite:s7,s9]].";
+        for (const options of [{}, { citations: false }]) {
+            for (const streaming of [false, true]) {
+                const tree = await createMarkdownParser(options)(content, { streaming });
+                expect(citations(tree.nodes)).toEqual([]);
+                expect(getNodeChildren(tree.nodes[0] ?? "")).toEqual([content]);
+            }
+        }
+    });
+
+    test("renders single and grouped references as dedicated nodes", async () => {
+        const tree = await createMarkdownParser({ citations: true })("Claim [[cite:s7]]. Another [[cite:s7,s9]].");
+        expect(citations(tree.nodes)).toEqual([
+            ["source-cite", { ids: "s7" }],
+            ["source-cite", { ids: "s7,s9" }],
+        ]);
+    });
+
+    test("does not interpret code, escaped references, or link labels", async () => {
+        for (const content of [
+            "`[[cite:s7]]`",
+            "```text\n[[cite:s7]]\n```",
+            "\\[[cite:s7]]",
+            "[Claim [[cite:s7]]](https://example.com)",
+        ]) {
+            const tree = await createMarkdownParser({ citations: true })(content);
+            expect(citations(tree.nodes)).toEqual([]);
+        }
+    });
+
+    test("streaming never auto-completes a citation", async () => {
+        const parse = createMarkdownParser({ citations: true });
+        const content = "Claim [[cite:s7,s9]]";
+        for (let length = 1; length < content.length; length++) {
+            expect(citations((await parse(content.slice(0, length), { streaming: true })).nodes)).toEqual([]);
+        }
+        expect(citations((await parse(content, { streaming: true })).nodes)).toHaveLength(1);
+        expect(citations((await parse(content)).nodes)).toHaveLength(1);
+    });
+});
+
+describe("citation sources", () => {
+    test("IDs survive storage, including duplicate URLs and multiple searches", () => {
+        const first = readSearchResponse({ results: [
+            { title: "One", url: "https://example.com" },
+            { title: "Two", url: "https://example.com" },
+        ] });
+        const second = readSearchResponse({ results: [{ title: "Three", url: "https://example.com" }] });
+        expect(first.ok && second.ok).toBe(true);
+        if (!first.ok || !second.ok) {
+            return;
+        }
+        const parts = [first.data, second.data].map(output => ({
+            toolCall: { toolName: "search", output: { type: "json", value: JSON.stringify(output) } },
+        }));
+        const sources = collectCitationSources(parts);
+        expect(sources.size).toBe(3);
+        expect(sources.get(first.data.results[0]?.sourceId ?? "")?.title).toBe("One");
+        expect(collectCitationSources(JSON.parse(JSON.stringify(parts)))).toEqual(sources);
+        expect(sources.has("invented")).toBe(false);
+        expect(collectCitationSources([]).size).toBe(0);
+    });
+
+    test("ignores legacy results, non-search tools, and unsafe URLs", () => {
+        const output = { type: "json", value: JSON.stringify({ results: [
+            { title: "Legacy", link: "https://example.com" },
+            { sourceId: "bad", title: "Bad", link: "javascript:alert(1)" },
+        ] }) };
+        expect(collectCitationSources([{ toolCall: { toolName: "search", output } }]).size).toBe(0);
+        expect(collectCitationSources([{ toolCall: { toolName: "python", output } }]).size).toBe(0);
+    });
+});
diff --git a/tests/composer-size.test.ts b/tests/composer-size.test.ts
new file mode 100644
index 0000000..320f5af
--- /dev/null
+++ b/tests/composer-size.test.ts
@@ -0,0 +1,25 @@
+import { describe, expect, test } from 'bun:test';
+import { getComposerHeight } from '../app/utils/composer-size';
+
+describe('composer height stability', () => {
+    test('subpixel noise never oscillates around the two-line minimum', () => {
+        const heights = [47.99999, 48, 48.01].map(height => getComposerHeight(height, 24, 0, 0, true));
+        expect(heights).toEqual([48, 48, 48]);
+    });
+
+    test('grows and shrinks for actual lines, capped at ten lines', () => {
+        expect([24, 48, 72, 264, 72, 24].map(height => getComposerHeight(height, 24, 0, 0, true)))
+            .toEqual([48, 48, 72, 240, 72, 48]);
+    });
+
+    test('accounts for padding and borders according to box sizing', () => {
+        expect(getComposerHeight(80, 24, 8, 2, true)).toBe(82);
+        expect(getComposerHeight(80, 24, 8, 2, false)).toBe(72);
+        expect(getComposerHeight(10, 24, 8, 2, true)).toBe(58);
+    });
+
+    test('respects fractional typography rather than hardcoding a 24px line', () => {
+        expect(getComposerHeight(40, 20.25, 0, 0, true)).toBe(41);
+        expect(getComposerHeight(1000, 20.25, 0, 0, true)).toBe(203);
+    });
+});
diff --git a/tests/markdown-transform.test.ts b/tests/markdown-transform.test.ts
new file mode 100644
index 0000000..d61db4a
--- /dev/null
+++ b/tests/markdown-transform.test.ts
@@ -0,0 +1,52 @@
+import type { MarkdownTree } from '../app/utils/markdown';
+import { expect, test } from 'bun:test';
+import { splitParagraphBreaks } from '../app/utils/markdown';
+
+test('paragraph splitting preserves nested formatting without mutating a cached parser tree', () => {
+    const tree = { nodes: [
+        ['p', {}, 'before', ['br', {}], ['strong', {}, 'after']],
+        ['blockquote', {}, 'one', ['br', {}], ['em', {}, 'two']],
+    ] } as MarkdownTree;
+    const original = structuredClone(tree);
+    const result = splitParagraphBreaks(tree);
+    expect(result.nodes).toEqual([
+        ['p', {}, 'before'],
+        ['p', {}, ['strong', {}, 'after']],
+        ['blockquote', {}, ['p', {}, 'one'], ['p', {}, ['em', {}, 'two']]],
+    ]);
+    expect(tree).toEqual(original);
+    expect(splitParagraphBreaks(tree)).toEqual(result);
+});
+
+test('br-free trees return by reference with no allocation', () => {
+    const tree = { nodes: [
+        ['p', {}, 'plain ', ['strong', {}, 'text']],
+        ['ul', {}, ['li', {}, 'one'], ['li', {}, 'two']],
+    ] } as MarkdownTree;
+    expect(splitParagraphBreaks(tree)).toBe(tree);
+});
+
+test('single newlines still split into sibling paragraphs', () => {
+    const tree = { nodes: [
+        ['p', {}, 'line one', ['br', {}], 'line two'],
+    ] } as MarkdownTree;
+    expect(splitParagraphBreaks(tree).nodes).toEqual([
+        ['p', {}, 'line one'],
+        ['p', {}, 'line two'],
+    ]);
+});
+
+test('nested changes rebuild only the affected path', () => {
+    const tree = { nodes: [
+        ['blockquote', {}, ['p', {}, 'kept']],
+        ['p', {}, 'split', ['br', {}], 'me'],
+    ] } as MarkdownTree;
+    const result = splitParagraphBreaks(tree);
+    expect(result).not.toBe(tree);
+    expect(result.nodes[0]).toBe(tree.nodes[0]);
+    expect(result.nodes).toEqual([
+        ['blockquote', {}, ['p', {}, 'kept']],
+        ['p', {}, 'split'],
+        ['p', {}, 'me'],
+    ]);
+});
diff --git a/tests/message-focus.test.ts b/tests/message-focus.test.ts
new file mode 100644
index 0000000..c1f4bff
--- /dev/null
+++ b/tests/message-focus.test.ts
@@ -0,0 +1,190 @@
+import { describe, expect, test } from "bun:test";
+import {
+    buildFocusedMessageTree,
+    buildMessageTree,
+    getActiveMessage,
+    getCurrentChildIndex,
+    getMessageCount,
+    getNextActiveChildId,
+} from "../utils/message";
+
+describe("message focus and versioning", () => {
+    test("reproduces and fixes the 3/2 focus bug after deleting root message and regenerating", () => {
+        // Step 1: Generate initial assistant message (A)
+        const msgA = {
+            id: "msg_a",
+            userId: "user_1",
+            topicId: "topic_1",
+            role: "assistant" as const,
+            content: "Response 1",
+            parentMessageId: null,
+            generationId: null,
+            activeChildId: null,
+            deleted: false,
+            createdAt: new Date(),
+            updatedAt: new Date(),
+            parts: [],
+            generation: null,
+            attachments: [],
+        };
+
+        let tree = buildMessageTree([msgA]);
+        expect(tree.length).toBe(1);
+        expect(getMessageCount(tree[0]!)).toBe(1);
+        expect(getCurrentChildIndex(tree[0]!)).toBe(0);
+        expect(getActiveMessage(tree[0]!)?.id).toBe("msg_a");
+
+        // Step 2: Regenerate the message -> creates child B, activeChildId points to B
+        const msgB = {
+            ...msgA,
+            id: "msg_b",
+            content: "Response 2",
+            parentMessageId: "msg_a",
+        };
+        msgA.activeChildId = "msg_b";
+
+        tree = buildMessageTree([msgA, msgB]);
+        expect(tree.length).toBe(1);
+        expect(tree[0]!.children.length).toBe(1);
+        expect(getMessageCount(tree[0]!)).toBe(2);
+        // Variant 2 of 2: index should be 1 (displayed as 1 + 1 = 2)
+        expect(getCurrentChildIndex(tree[0]!)).toBe(1);
+        expect(getActiveMessage(tree[0]!)?.id).toBe("msg_b");
+
+        // Step 3: Switch focus to first, root message (A)
+        const prevId = getNextActiveChildId(tree[0]!, -1);
+        expect(prevId).toBeNull();
+        msgA.activeChildId = null;
+
+        tree = buildMessageTree([msgA, msgB]);
+        expect(getMessageCount(tree[0]!)).toBe(2);
+        // Variant 1 of 2: index should be 0 (displayed as 0 + 1 = 1)
+        expect(getCurrentChildIndex(tree[0]!)).toBe(0);
+        expect(getActiveMessage(tree[0]!)?.id).toBe("msg_a");
+
+        // Step 4: Delete the root message (A)
+        // Root is soft-deleted, active child switches to B
+        msgA.deleted = true;
+        msgA.activeChildId = "msg_b";
+
+        tree = buildMessageTree([msgA, msgB]);
+        expect(tree.length).toBe(1);
+        expect(tree[0]!.deleted).toBe(true);
+        expect(getMessageCount(tree[0]!)).toBe(1);
+        expect(getCurrentChildIndex(tree[0]!)).toBe(0);
+        expect(getActiveMessage(tree[0]!)?.id).toBe("msg_b");
+
+        // Step 5: Regenerate the message -> creates child C with parentMessageId: msg_a
+        const msgC = {
+            ...msgA,
+            id: "msg_c",
+            content: "Response 3",
+            parentMessageId: "msg_a",
+            deleted: false,
+        };
+        msgA.activeChildId = "msg_c";
+
+        tree = buildMessageTree([msgA, msgB, msgC]);
+        expect(tree.length).toBe(1);
+        expect(tree[0]!.children.length).toBe(2);
+        expect(getMessageCount(tree[0]!)).toBe(2);
+        // Crucial test: When C (second child) is active, index must be 1 (displayed as 2/2, NOT 3/2!)
+        expect(getCurrentChildIndex(tree[0]!)).toBe(1);
+        expect(getActiveMessage(tree[0]!)?.id).toBe("msg_c");
+
+        // Verify switching focus back to B works seamlessly
+        const backToB = getNextActiveChildId(tree[0]!, -1);
+        expect(backToB).toBe("msg_b");
+        msgA.activeChildId = backToB;
+
+        tree = buildMessageTree([msgA, msgB, msgC]);
+        expect(getCurrentChildIndex(tree[0]!)).toBe(0);
+        expect(getActiveMessage(tree[0]!)?.id).toBe("msg_b");
+
+        // Verify switching forward to C works seamlessly
+        const forwardToC = getNextActiveChildId(tree[0]!, 1);
+        expect(forwardToC).toBe("msg_c");
+        msgA.activeChildId = forwardToC;
+
+        tree = buildMessageTree([msgA, msgB, msgC]);
+        expect(getCurrentChildIndex(tree[0]!)).toBe(1);
+        expect(getActiveMessage(tree[0]!)?.id).toBe("msg_c");
+    });
+
+    test("buildFocusedMessageTree excludes soft-deleted root messages", () => {
+        const root = {
+            id: "root",
+            userId: "user_1",
+            topicId: "topic_1",
+            role: "assistant" as const,
+            content: "Root",
+            parentMessageId: null,
+            generationId: null,
+            activeChildId: "child_1",
+            deleted: true,
+            createdAt: new Date(),
+            updatedAt: new Date(),
+            parts: [],
+            generation: null,
+            attachments: [],
+        };
+        const child1 = {
+            ...root,
+            id: "child_1",
+            content: "Child 1",
+            parentMessageId: "root",
+            activeChildId: null,
+            deleted: false,
+        };
+
+        const tree = buildMessageTree([root, child1]);
+        const focused = buildFocusedMessageTree(tree);
+
+        expect(focused.length).toBe(1);
+        expect(focused[0]!.id).toBe("child_1");
+        expect(focused[0]!.deleted).toBe(false);
+    });
+
+    test("buildMessageTree filters out deleted roots with no children", () => {
+        const deletedEmptyRoot = {
+            id: "deleted_root",
+            userId: "user_1",
+            topicId: "topic_1",
+            role: "assistant" as const,
+            content: "Empty",
+            parentMessageId: null,
+            generationId: null,
+            activeChildId: null,
+            deleted: true,
+            createdAt: new Date(),
+            updatedAt: new Date(),
+            parts: [],
+            generation: null,
+            attachments: [],
+        };
+
+        const tree = buildMessageTree([deletedEmptyRoot]);
+        expect(tree.length).toBe(0);
+    });
+
+    test("getNextActiveChildId clamps to bounds and handles null fallback", () => {
+        const root = {
+            id: "root",
+            deleted: true,
+            activeChildId: null as string | null,
+            children: [
+                { id: "child_a" },
+                { id: "child_b" },
+            ],
+        };
+
+        // If activeChildId is null and root is deleted, going left stays at child_a
+        expect(getNextActiveChildId(root, -1)).toBe("child_a");
+        // Going right moves to child_b
+        expect(getNextActiveChildId(root, 1)).toBe("child_b");
+
+        // When at child_b, going right clamps to child_b
+        root.activeChildId = "child_b";
+        expect(getNextActiveChildId(root, 1)).toBe("child_b");
+    });
+});
diff --git a/tests/topic-rename.test.ts b/tests/topic-rename.test.ts
new file mode 100644
index 0000000..1bfc3eb
--- /dev/null
+++ b/tests/topic-rename.test.ts
@@ -0,0 +1,42 @@
+import { describe, expect, test } from "bun:test";
+import { addPendingRename, cancelPendingRename, completeRename } from "../server/utils/renames";
+import { provisionalTopicTitle } from "../utils/topic-title";
+
+describe("rename attempt ownership", () => {
+    test("an old completion cannot remove a newer attempt", () => {
+        addPendingRename("topic", "old");
+        const current = addPendingRename("topic", "new");
+        completeRename("topic", "old");
+        cancelPendingRename("topic", "new");
+        expect(current.signal.aborted).toBe(true);
+    });
+
+    test("an old cancellation cannot abort a newer attempt", () => {
+        const current = addPendingRename("topic", "new");
+        cancelPendingRename("topic", "old");
+        expect(current.signal.aborted).toBe(false);
+        completeRename("topic", "new");
+    });
+
+    test("cancellation is safe after completion or restart", () => {
+        cancelPendingRename("missing", "old");
+        const current = addPendingRename("topic", "new");
+        completeRename("topic", "new");
+        cancelPendingRename("topic", "new");
+        expect(current.signal.aborted).toBe(false);
+    });
+});
+
+describe("provisional titles", () => {
+    test("uses the first meaningful line and normalizes whitespace", () => {
+        expect(provisionalTopicTitle({ content: "\n  Help   me debug this\nMore details" })).toBe("Help me debug this");
+    });
+    test("names attachment-only conversations", () => {
+        expect(provisionalTopicTitle({ content: "", files: [{ name: "photo.jpg" }] })).toBe("photo.jpg");
+        expect(provisionalTopicTitle({ content: "", fileIds: ["image"] })).toBe("Attached files");
+    });
+    test("bounds title length and handles empty input", () => {
+        expect(provisionalTopicTitle({ content: "a".repeat(200) })).toHaveLength(100);
+        expect(provisionalTopicTitle()).toBe("New Topic");
+    });
+});
diff --git a/tests/topic-sync.test.ts b/tests/topic-sync.test.ts
new file mode 100644
index 0000000..4e89319
--- /dev/null
+++ b/tests/topic-sync.test.ts
@@ -0,0 +1,131 @@
+import { describe, expect, test } from 'bun:test';
+import { createHash } from 'node:crypto';
+import { topicEvents } from '../server/utils/events';
+import { createTopicSnapshotStream } from '../server/utils/topic-snapshot-stream';
+import { appendTextDelta, serializeTopicSnapshot } from '../utils/topic-sync';
+
+const snapshot = () => ({
+    id: 'topic',
+    name: 'Example',
+    messages: [{
+        id: 'message',
+        activeChildId: null as string | null,
+        updatedAt: new Date('2026-09-27T00:00:00Z'),
+        generation: { status: 'pending', tokens: null as unknown },
+        parts: [{ id: 'part', type: 'text', content: 'hello', finished: false }],
+    }],
+});
+const fingerprint = (value: unknown) => createHash('sha256').update(serializeTopicSnapshot(value)).digest('hex');
+const readEvent = async (reader: ReadableStreamDefaultReader<string>) => {
+    const { value } = await reader.read();
+    return JSON.parse(value!.slice(6));
+};
+
+describe('topic snapshot synchronization', () => {
+    test('matches database Dates and hydrated JSON regardless of object key order', () => {
+        const topic = snapshot();
+        const hydrated = JSON.parse(JSON.stringify(topic));
+        expect(fingerprint({ messages: hydrated.messages, name: hydrated.name, id: hydrated.id })).toBe(fingerprint(topic));
+    });
+
+    test('detects older-message, part, generation, variant, and topic changes without relying on count', () => {
+        const original = fingerprint(snapshot());
+        for (const change of [
+            (topic: ReturnType<typeof snapshot>) => topic.name = 'Renamed',
+            (topic: ReturnType<typeof snapshot>) => topic.messages[0]!.activeChildId = 'variant',
+            (topic: ReturnType<typeof snapshot>) => topic.messages[0]!.parts[0]!.content = 'edited',
+            (topic: ReturnType<typeof snapshot>) => topic.messages[0]!.parts[0]!.finished = true,
+            (topic: ReturnType<typeof snapshot>) => topic.messages[0]!.generation.tokens = { output: 123 },
+        ]) {
+            const topic = snapshot();
+            change(topic);
+            expect(fingerprint(topic)).not.toBe(original);
+        }
+    });
+
+    test('matching state receives a small ready event, then live changes', async () => {
+        const topic = snapshot();
+        const subscription = createTopicSnapshotStream('match', fingerprint(topic));
+        const result = await subscription.open(async () => topic);
+        expect(result.ok).toBe(true);
+        if (!result.ok) return;
+        const reader = result.data.getReader();
+        try {
+            expect(await readEvent(reader)).toEqual({ type: 'synced', payload: { id: 'match' } });
+            await topicEvents.emit('match', { type: 'topic_updated', payload: { name: 'New' } });
+            expect((await readEvent(reader)).payload).toEqual({ name: 'New' });
+        } finally {
+            await reader.cancel();
+        }
+    });
+
+    test('stale or missing fingerprints receive a full replacement snapshot', async () => {
+        for (const offered of [undefined, fingerprint(snapshot())]) {
+            const topic = snapshot();
+            topic.messages[0]!.parts[0]!.content = 'changed';
+            const subscription = createTopicSnapshotStream('stale', offered);
+            const result = await subscription.open(async () => topic);
+            expect(result.ok).toBe(true);
+            if (!result.ok) continue;
+            const reader = result.data.getReader();
+            try {
+                const event = await readEvent(reader);
+                expect(event.type).toBe('initial_state');
+                expect(event.payload.messages[0].parts[0].content).toBe('changed');
+            } finally {
+                await reader.cancel();
+            }
+        }
+    });
+
+    test('captures events during the DB query and includes text not yet persisted', async () => {
+        const id = 'query-race';
+        const initial = snapshot();
+        await topicEvents.emit(id, {
+            type: 'text-start', payload: { messageId: 'message', part: initial.messages[0]!.parts[0] },
+        });
+        // This delta predates subscription and has not reached the database yet.
+        await topicEvents.emit(id, {
+            type: 'text-delta', payload: { messageId: 'message', partId: 'part', content: ' world', offset: 5 },
+        });
+        const pending = Promise.withResolvers<ReturnType<typeof snapshot>>();
+        const subscription = createTopicSnapshotStream(id, fingerprint(initial));
+        const opening = subscription.open(() => pending.promise);
+        await topicEvents.emit(id, {
+            type: 'text-delta', payload: { messageId: 'message', partId: 'part', content: '!', offset: 11 },
+        });
+        pending.resolve(snapshot());
+        const result = await opening;
+        expect(result.ok).toBe(true);
+        if (!result.ok) return;
+        const reader = result.data.getReader();
+        try {
+            const state = await readEvent(reader);
+            expect(state.type).toBe('initial_state');
+            const text = state.payload.messages[0].parts[0].content;
+            expect(text).toBe('hello world!');
+            const replay = await readEvent(reader);
+            expect(replay.replay).toBe(true);
+            expect(appendTextDelta(text, replay.payload.content, replay.payload.offset)).toBe(text);
+        } finally {
+            await reader.cancel();
+            topicEvents.clearLiveText(id, 'message');
+        }
+    });
+
+    test('cancellation during snapshot loading does not establish a stream', async () => {
+        const pending = Promise.withResolvers<ReturnType<typeof snapshot>>();
+        const subscription = createTopicSnapshotStream('cancelled', undefined);
+        const opening = subscription.open(() => pending.promise);
+        subscription.close();
+        pending.resolve(snapshot());
+        expect((await opening).ok).toBe(false);
+    });
+
+    test('text offsets handle partial overlaps, duplicates, and gaps', () => {
+        expect(appendTextDelta('hello w', ' world', 5)).toBe('hello world');
+        expect(appendTextDelta('hello world', ' world', 5)).toBe('hello world');
+        expect(appendTextDelta('hello', '!', 5)).toBe('hello!');
+        expect(appendTextDelta('hello', '!', 10)).toBe('hello');
+    });
+});
diff --git a/utils/message.ts b/utils/message.ts
index f4297db..558dbe4 100644
--- a/utils/message.ts
+++ b/utils/message.ts
@@ -1,9 +1,86 @@
 import type { AssistantContent, FilePart, ImagePart, JSONValue, ModelMessage, ToolContent } from "ai";
-import { ToolCallType } from "~~/drizzle/schema";
-import { Err, Ok, type Result } from "~~/types/result";
-import type { Message, MessageEntity } from "~/composables/useChat";
-import type { Agent } from "~/composables/useAgents";
-import { resolveFileUrl } from "~~/utils/url";
+import { ToolCallType } from "../drizzle/schema";
+import { Err, Ok, type Result } from "../types/result";
+import type { Message, MessageEntity } from "../app/composables/useChat";
+import type { Agent } from "../app/composables/useAgents";
+import { resolveFileUrl } from "./url";
+
+export const getActiveMessage = <T extends { id: string; deleted?: boolean | null; activeChildId?: string | null; children: (T | undefined)[] }>(
+    message: T
+): T | null => {
+    if (message.activeChildId && message.children.length > 0) {
+        const child = message.children.find(c => c?.id === message.activeChildId);
+        if (child) {
+            return child;
+        }
+    }
+
+    if (message.deleted === true) {
+        if (message.children.length > 0 && message.children[0]) {
+            return message.children[0];
+        }
+        return null;
+    }
+
+    return message;
+};
+
+export const getMessageCount = (message: {
+    deleted?: boolean | null;
+    children: unknown[];
+}): number => {
+    if (message.deleted === true) {
+        return message.children.length;
+    }
+
+    return message.children.length + 1;
+};
+
+export const getCurrentChildIndex = (message: {
+    deleted?: boolean | null;
+    activeChildId?: string | null;
+    children: ({ id: string } | undefined)[];
+}): number => {
+    if (message.deleted === true) {
+        if (!message.activeChildId) {
+            return 0;
+        }
+        const idx = message.children.findIndex(c => c?.id === message.activeChildId);
+        return idx >= 0 ? idx : 0;
+    }
+
+    if (!message.activeChildId) {
+        return 0;
+    }
+    const idx = message.children.findIndex(c => c?.id === message.activeChildId);
+    return idx >= 0 ? idx + 1 : 0;
+};
+
+export const getNextActiveChildId = (
+    message: {
+        deleted?: boolean | null;
+        activeChildId?: string | null;
+        children: ({ id: string } | undefined)[];
+    },
+    direction: -1 | 1
+): string | null => {
+    const allItems = message.deleted === true
+        ? message.children
+        : [null, ...message.children];
+
+    const currentIdx = allItems.findIndex(item => {
+        if (!item) {
+            return !message.activeChildId;
+        }
+        return item.id === message.activeChildId;
+    });
+
+    const validCurrentIdx = currentIdx >= 0 ? currentIdx : 0;
+    const newIdx = Math.max(0, Math.min(allItems.length - 1, validCurrentIdx + direction));
+    const newItem = allItems[newIdx];
+
+    return newItem?.id ?? null;
+};
 
 export const buildMessageTree = (flatMessages: MessageEntity[]) => {
     const messagesMap = new Map(flatMessages.map(m => [m.id, { ...m, children: [] as MessageEntity[] }]));
@@ -16,26 +93,21 @@ export const buildMessageTree = (flatMessages: MessageEntity[]) => {
             roots.push(msg);
         }
     }
-    return roots;
+    return roots.filter(root => !root.deleted || root.children.length > 0);
 };
 
 export const buildFocusedMessageTree = (messages: Readonly<Message[]>): MessageEntity[] => {
-    let focusedMessageTree: MessageEntity[] = [];
+    const focusedMessageTree: MessageEntity[] = [];
 
     for (const message of messages) {
-        if (message.activeChildId && message.children.length > 0) {
-            const activeChild = message.children.find(c => c?.id === message.activeChildId);
-            if (activeChild) {
-                focusedMessageTree.push(activeChild);
-                continue;
-            }
+        const activeMessage = getActiveMessage(message);
+        if (activeMessage) {
+            focusedMessageTree.push(activeMessage);
         }
-
-        focusedMessageTree.push(message);
     }
 
     return focusedMessageTree;
-}
+};
 
 export interface MarshallOptions {
     signFileUrl?: (fileKey: string) => string;
diff --git a/utils/topic-sync.ts b/utils/topic-sync.ts
new file mode 100644
index 0000000..0d63eb1
--- /dev/null
+++ b/utils/topic-sync.ts
@@ -0,0 +1,21 @@
+/** Stable across database Dates, JSON SSE payloads, and Nuxt hydration. */
+export const serializeTopicSnapshot = (topic: unknown): string => JSON.stringify(topic, (_key, value) => {
+    if (value === null || typeof value !== 'object' || Array.isArray(value)) {
+        return value;
+    }
+
+    return Object.fromEntries(Object.keys(value).sort().map(key => [key, value[key]]));
+});
+
+/** Absolute offsets make replay across a snapshot boundary idempotent. */
+export const appendTextDelta = (current: string, content: string, offset?: number): string => {
+    if (offset === undefined) {
+        return current + content;
+    }
+    if (offset > current.length) {
+        // A gap requires reconciliation, not silently concatenating corrupt text.
+        return current;
+    }
+    const overlap = current.length - offset;
+    return overlap >= content.length ? current : current + content.slice(overlap);
+};
diff --git a/utils/topic-title.ts b/utils/topic-title.ts
new file mode 100644
index 0000000..dc7cce0
--- /dev/null
+++ b/utils/topic-title.ts
@@ -0,0 +1,9 @@
+export const provisionalTopicTitle = (message?: {
+    content: string;
+    files?: { name: string }[];
+    fileIds?: string[];
+}): string => {
+    const line = message?.content.split(/\r?\n/).map(line => line.trim()).find(Boolean);
+    const title = line || message?.files?.[0]?.name || (message?.fileIds?.length ? "Attached files" : "New Topic");
+    return title.replace(/\s+/g, " ").slice(0, 100);
+};