feat(chat): add conversation search with Cmd+F (M8.4)

Glass search panel with real-time filtering, match counter,
up/down navigation to jump between matching messages.
Keyboard shortcuts: Cmd+F to open, Escape to close, Enter/arrows
to navigate between matches.

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

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

@@ -0,0 +1,137 @@
+<template>
+  <div
+    v-if="isOpen"
+    class="glass px-3 py-2 mx-3 mb-1 rounded-xl flex items-center gap-2 animate-fade-up-fast"
+  >
+    <svg class="w-4 h-4 text-white/40 shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+      <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
+    </svg>
+    <input
+      ref="inputRef"
+      v-model="query"
+      type="text"
+      placeholder="Search messages..."
+      class="flex-1 bg-transparent text-sm text-white/90 placeholder:text-white/25 outline-none min-w-0"
+      @keydown.enter.exact="nextMatch"
+      @keydown.shift.enter="prevMatch"
+      @keydown.escape="close"
+      @keydown.up.prevent="prevMatch"
+      @keydown.down.prevent="nextMatch"
+    />
+    <span v-if="query" class="text-[10px] text-white/40 whitespace-nowrap select-none">
+      {{ matchCount > 0 ? `${currentMatchIndex + 1}/${matchCount}` : 'No results' }}
+    </span>
+    <button
+      class="w-6 h-6 flex items-center justify-center rounded-md hover:bg-white/10 transition-colors text-white/50 hover:text-white/80 disabled:opacity-30"
+      :disabled="matchCount === 0"
+      aria-label="Previous match"
+      @click="prevMatch"
+    >
+      <svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 15l7-7 7 7" />
+      </svg>
+    </button>
+    <button
+      class="w-6 h-6 flex items-center justify-center rounded-md hover:bg-white/10 transition-colors text-white/50 hover:text-white/80 disabled:opacity-30"
+      :disabled="matchCount === 0"
+      aria-label="Next match"
+      @click="nextMatch"
+    >
+      <svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7" />
+      </svg>
+    </button>
+    <button
+      class="w-6 h-6 flex items-center justify-center rounded-md hover:bg-white/10 transition-colors text-white/50 hover:text-white/80"
+      aria-label="Close search"
+      @click="close"
+    >
+      <svg class="w-3 h-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
+      </svg>
+    </button>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed, watch, nextTick, onMounted, onUnmounted } from 'vue'
+import type { Message } from '@aiui/core/types/message'
+
+const props = defineProps<{
+  messages: Message[]
+}>()
+
+const emit = defineEmits<{
+  scrollToMessage: [index: number]
+}>()
+
+const isOpen = ref(false)
+const query = ref('')
+const currentMatchIndex = ref(0)
+const inputRef = ref<HTMLInputElement | null>(null)
+
+const matchingIndices = computed(() => {
+  if (!query.value.trim()) return []
+  const q = query.value.toLowerCase()
+  const indices: number[] = []
+  for (let i = 0; i < props.messages.length; i++) {
+    if (props.messages[i].content.toLowerCase().includes(q)) {
+      indices.push(i)
+    }
+  }
+  return indices
+})
+
+const matchCount = computed(() => matchingIndices.value.length)
+
+watch(query, () => {
+  currentMatchIndex.value = 0
+  if (matchingIndices.value.length > 0) {
+    emit('scrollToMessage', matchingIndices.value[0])
+  }
+})
+
+function nextMatch() {
+  if (matchCount.value === 0) return
+  currentMatchIndex.value = (currentMatchIndex.value + 1) % matchCount.value
+  emit('scrollToMessage', matchingIndices.value[currentMatchIndex.value])
+}
+
+function prevMatch() {
+  if (matchCount.value === 0) return
+  currentMatchIndex.value = (currentMatchIndex.value - 1 + matchCount.value) % matchCount.value
+  emit('scrollToMessage', matchingIndices.value[currentMatchIndex.value])
+}
+
+function open() {
+  isOpen.value = true
+  nextTick(() => inputRef.value?.focus())
+}
+
+function close() {
+  isOpen.value = false
+  query.value = ''
+  currentMatchIndex.value = 0
+}
+
+function handleKeydown(e: KeyboardEvent) {
+  if ((e.metaKey || e.ctrlKey) && e.key === 'f') {
+    e.preventDefault()
+    if (isOpen.value) {
+      inputRef.value?.focus()
+    } else {
+      open()
+    }
+  }
+}
+
+onMounted(() => {
+  document.addEventListener('keydown', handleKeydown)
+})
+
+onUnmounted(() => {
+  document.removeEventListener('keydown', handleKeydown)
+})
+
+defineExpose({ open, close, isOpen, matchingIndices, currentMatchIndex })
+</script>

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

@@ -12,6 +12,12 @@
 
     <BranchSwitcher />
 
+    <ChatSearch
+      ref="chatSearchRef"
+      :messages="messages"
+      @scroll-to-message="scrollToMessageIndex"
+    />
+
     <!-- Collapsed: prompt index -->
     <PromptIndex
       v-if="chatCollapsed"
@@ -98,6 +104,7 @@ import ChatInput from './ChatInput.vue'
 import StreamingDots from './StreamingDots.vue'
 import PromptIndex from './PromptIndex.vue'
 import BranchSwitcher from './BranchSwitcher.vue'
+import ChatSearch from './ChatSearch.vue'
 import ErrorBoundary from '@/components/ui/ErrorBoundary.vue'
 import type { Message } from '@aiui/core/types/message'
 
@@ -125,6 +132,11 @@ const { updatePanelFromText, panelOpen, activeTab, availableTabs, setActiveTab }
 import { useCodeContext } from '@/composables/useCodeContext'
 const codeContext = useCodeContext()
 const messageListRef = ref<HTMLElement | null>(null)
+const chatSearchRef = ref<InstanceType<typeof ChatSearch> | null>(null)
+
+function scrollToMessageIndex(index: number) {
+  virtualizer.value.scrollToIndex(index, { align: 'center' })
+}
 
 // Reply-to threading state
 const replyTo = ref<{ messageId: string; excerpt: string } | null>(null)