feat: add timestamp and forking

app/components/Message/index.vue

@@ -12,6 +12,7 @@ const emit = defineEmits<{
     delete: [];
     edit: [value: string];
     patch: [updates: Partial<Message>];
+    fork: [];
 }>();
 
 let reqAbortController: AbortController | null = null;
@@ -126,6 +127,10 @@ const handleEdit = async () => {
     });
 };
 
+const forkMessage = () => {
+    emit('fork');
+};
+
 const deleteMessage = () => {
     emit('delete');
 };
@@ -205,6 +210,10 @@ const navigateChild = (direction: -1 | 1) => {
                     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>
                 </button>
+                <button @click="forkMessage"
+                    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>
+                </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)]">