fix: Per-agent terminal isolation, floating terminal z-index, and char-by-char input

- Add :key to PromptBar to force remount on agent switch, fixing shared terminal session bug
- Raise AgentTerminal z-index above PromptBar backdrop so floating terminal is visible/clickable
- Send prompt text char-by-char (15ms delay) matching FloatingVoice pattern for Claude Code compat
- Guard xterm dispose against unloaded addons to prevent errors on agent switch
- Widen PromptBar panel from 360px to 420px to fit all ChatInput buttons

frontend/src/App.vue

@@ -8,6 +8,7 @@ import FloatingResponse from './components/FloatingResponse.vue'
 import FloatingVoice from './components/FloatingVoice.vue'
 import AgentBar from './components/AgentBar.vue'
 import HookNotifications from './components/HookNotifications.vue'
+import NotificationLog from './components/NotificationLog.vue'
 import PwaInstallBanner from './components/PwaInstallBanner.vue'
 import { initWebMCP, getWebMCP } from './services/webmcp'
 import { initTorch, destroyTorch } from './services/torch'
@@ -67,6 +68,7 @@ function clearDebugLogs() {
 }
 const terminalRef = ref<InstanceType<typeof FloatingTerminal> | null>(null)
 const responseRef = ref<InstanceType<typeof FloatingResponse> | null>(null)
+const notifLogRef = ref<InstanceType<typeof NotificationLog> | null>(null)
 const voiceRef = ref<InstanceType<typeof FloatingVoice> | null>(null)
 const canvasStore = useCanvasStore()
 const projectCanvasStore = useProjectCanvasStore()
@@ -330,6 +332,8 @@ onMounted(async () => {
   // Setup response controls for MCP tools
   setResponseControls({
     addMessage: (message: string, type?: 'info' | 'success' | 'warning' | 'error') => {
+      // Also log to notification log
+      notifLogRef.value?.addResponseEntry(message, type || 'info')
       if (responseRef.value) {
         return responseRef.value.addMessage(message, type)
       }
@@ -544,6 +548,9 @@ watch(() => route.name, (newPage) => {
     <!-- Hook Notifications (toasts from Claude Code hooks) -->
     <HookNotifications />
 
+    <!-- Notification Log (temporary - collects all notifications, persists to localStorage) -->
+    <NotificationLog ref="notifLogRef" />
+
     <!-- Floating Voice Input -->
     <FloatingVoice ref="voiceRef" v-model="showVoice" />