feat(chat): add response feedback thumbs up/down (M9.5)

Thumbs up/down buttons on assistant messages (hover action bar). Feedback
stored per message, persisted in IDB, included in conversation exports.
Toggle to clear feedback. Color-coded: green for up, red for down.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/app/src/components/chat/ChatMessage.vue

@@ -43,6 +43,25 @@
         >
           <svg xmlns="http://www.w3.org/2000/svg" class="w-3.5 h-3.5" viewBox="0 0 20 20" fill="currentColor"><path fill-rule="evenodd" d="M5 3a2 2 0 00-2 2v2a2 2 0 002 2h2a2 2 0 002-2V5a2 2 0 00-2-2H5zM5 11a2 2 0 00-2 2v2a2 2 0 002 2h2a2 2 0 002-2v-2a2 2 0 00-2-2H5zM11 5a2 2 0 012-2h2a2 2 0 012 2v2a2 2 0 01-2 2h-2a2 2 0 01-2-2V5z" clip-rule="evenodd" /></svg>
         </button>
+        <!-- Feedback thumbs -->
+        <button
+          v-if="!isUser"
+          class="glass-button-sm !h-7 !min-h-0 !w-7 !min-w-0 !px-0 flex items-center justify-center transition-colors"
+          :class="message.feedback === 'up' ? 'text-green-400' : 'text-white/60 hover:text-green-400/80'"
+          title="Good response"
+          @click.stop="toggleFeedback('up')"
+        >
+          <svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 20 20"><path d="M2 10.5a1.5 1.5 0 113 0v6a1.5 1.5 0 01-3 0v-6zM6 10.333v5.43a2 2 0 001.106 1.79l.05.025A4 4 0 008.943 18h5.416a2 2 0 001.962-1.608l1.2-6A2 2 0 0015.56 8H12V4a2 2 0 00-2-2 1 1 0 00-1 1v.667a4 4 0 01-.8 2.4L6.8 7.933a4 4 0 00-.8 2.4z" /></svg>
+        </button>
+        <button
+          v-if="!isUser"
+          class="glass-button-sm !h-7 !min-h-0 !w-7 !min-w-0 !px-0 flex items-center justify-center transition-colors"
+          :class="message.feedback === 'down' ? 'text-red-400' : 'text-white/60 hover:text-red-400/80'"
+          title="Poor response"
+          @click.stop="toggleFeedback('down')"
+        >
+          <svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 20 20"><path d="M18 9.5a1.5 1.5 0 11-3 0v-6a1.5 1.5 0 013 0v6zM14 9.667v-5.43a2 2 0 00-1.106-1.79l-.05-.025A4 4 0 0011.057 2H5.64a2 2 0 00-1.962 1.608l-1.2 6A2 2 0 004.44 12H8v4a2 2 0 002 2 1 1 0 001-1v-.667a4 4 0 01.8-2.4l1.4-1.866a4 4 0 00.8-2.4z" /></svg>
+        </button>
       </div>
 
       <div
@@ -305,8 +324,14 @@ const emit = defineEmits<{
   regenerate: []
   branch: [messageId: string]
   reply: [messageId: string, content: string]
+  feedback: [messageId: string, value: 'up' | 'down' | undefined]
 }>()
 
+function toggleFeedback(value: 'up' | 'down') {
+  const newValue = props.message.feedback === value ? undefined : value
+  emit('feedback', props.message.id, newValue)
+}
+
 // Editing state
 const isEditing = ref(false)
 const editContent = ref('')

packages/app/src/components/chat/ChatWindow.vue

@@ -74,6 +74,7 @@
               @regenerate="handleRegenerate"
               @branch="handleBranch"
               @reply="handleReply"
+              @feedback="handleFeedback"
             />
           </ErrorBoundary>
         </div>
@@ -249,6 +250,12 @@ function handleBranch(messageId: string) {
   chatStore.branchFromMessage(convId, messageId)
 }
 
+function handleFeedback(messageId: string, value: 'up' | 'down' | undefined) {
+  const convId = chatStore.activeConversationId
+  if (!convId) return
+  chatStore.setMessageFeedback(convId, messageId, value)
+}
+
 function handleExtract(text: string) {
   // Run content extraction without sending to AI
   const convId = chatStore.activeConversationId ?? chatStore.createConversation()

packages/app/src/stores/chat.ts

@@ -222,6 +222,16 @@ export const useChatStore = defineStore('chat', () => {
     }
   }
 
+  function setMessageFeedback(conversationId: string, messageId: string, feedback: 'up' | 'down' | undefined) {
+    const conv = conversations.value.get(conversationId)
+    if (!conv) return
+    const msg = conv.messages.find((m: { id: string }) => m.id === messageId)
+    if (msg) {
+      msg.feedback = feedback
+      debouncedIDBSave(conv)
+    }
+  }
+
   function switchSide() {
     panelSide.value = panelSide.value === 'right' ? 'left' : 'right'
   }
@@ -348,6 +358,7 @@ export const useChatStore = defineStore('chat', () => {
     addMessage,
     appendToLastMessage,
     setMessageWebResults,
+    setMessageFeedback,
     switchSide,
     toggleChatCollapse,
     setActiveConversation,

packages/core/src/types/message.ts

@@ -32,6 +32,8 @@ export interface Message {
   editedAt?: number
   /** Attached images (base64, max 4) for vision-capable models */
   images?: ImageAttachment[]
+  /** User feedback: 'up' = thumbs up, 'down' = thumbs down */
+  feedback?: 'up' | 'down'
 }
 
 export interface Reaction {