fix(tts): add speak() for complete responses; fix briefing message commit race

frontend/src/views/BriefingView.vue

@@ -148,11 +148,14 @@ watch(selectedConvId, async (id) => {
   }
 })
 
-// Refresh messages after streaming ends
+// Refresh messages after streaming ends — read from store directly (already updated before streaming=false)
 watch(() => chatStore.streaming, async (streaming) => {
-  if (!streaming && _mounted && selectedConvId.value === todayConvId.value && todayConvId.value) {
-    const today = await getBriefingToday().catch(() => null)
-    if (_mounted && today) messages.value = today.messages
+  if (!streaming && _mounted && selectedConvId.value === todayConvId.value) {
+    const storeMessages = chatStore.currentConversation?.messages
+    if (_mounted && storeMessages?.length) {
+      messages.value = storeMessages as unknown as BriefingMessage[]
+    }
+    await nextTick()
     if (_mounted) scrollToBottom()
   }
 })
@@ -420,7 +423,7 @@ onMounted(async () => {
             v-if="voiceTtsEnabled"
             class="btn-icon"
             :class="{ 'btn-icon-active': listenMode, 'btn-icon-busy': tts.speaking.value }"
-            @click="listenMode = !listenMode; if (!listenMode) tts.stop()"
+            @click="listenMode = !listenMode; if (listenMode) tts.speak([...messages].reverse().find(m => m.role === 'assistant')?.content ?? ''); else tts.stop()"
             :title="listenMode ? 'Stop auto-read' : 'Read replies aloud'"
             aria-label="Toggle listen mode"
           >