feat: file upload retry, secure file tokens, UI polish

- Add HMAC-based file token auth for secure AI model file access
- Add file upload retry with exponential backoff (max 3 retries)
- File endpoint now requires session auth or signed token
- Support assistant role messages in chat input
- Optimistic UI for attachments on message send
- Verify topic ownership before allowing messages
- Switch web scraping to Firecrawl API
- Agent profile page layout fixes (proper flex overflow)
- Add quick switcher (Ctrl+K) to sidenav
- Clean up longcat.ts and stale comments

server/api/topic/[topicId]/auto-rename/index.post.ts

@@ -44,6 +44,11 @@ export default defineEventHandler(async (event) => {
         },
         with: {
             parts: true,
+            attachments: {
+                with: {
+                    file: true,
+                }
+            },
         },
     });
 
@@ -160,8 +165,18 @@ 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 abortController = addPendingRename(topicId);
-    event.waitUntil(autoRename(topicId, abortController, { gateway: gateway.gateway, model }, gateway.textTransformer, firstMessage.content!, userId));
+    event.waitUntil(autoRename(topicId, abortController, { gateway: gateway.gateway, model }, gateway.textTransformer, prompt, userId));
 
     return {
         ok: true,