feat: Add debug console panel for mobile debugging

Replace ConnectionDropdown with debug console button that intercepts
console.log/warn/error and displays them in an overlay panel. Allows
copying logs for debugging on mobile devices without dev tools.

frontend/src/App.vue

@@ -5,7 +5,7 @@ import StatusBar from './components/StatusBar.vue'
 import Toolbar from './components/Toolbar.vue'
 import ComponentsDropdown from './components/ComponentsDropdown.vue'
 import ToolsDropdown from './components/ToolsDropdown.vue'
-import ConnectionDropdown from './components/ConnectionDropdown.vue'
+// ConnectionDropdown removed - replaced with debug console
 import FloatingTerminal from './components/FloatingTerminal.vue'
 import FloatingResponse from './components/FloatingResponse.vue'
 import FloatingVoice from './components/FloatingVoice.vue'
@@ -21,6 +21,46 @@ const route = useRoute()
 const router = useRouter()
 const showTerminal = ref(false)
 const showVoice = ref(false)
+const showDebugConsole = ref(false)
+const debugLogs = ref<Array<{ type: string; message: string; time: string }>>([])
+
+// Intercept console.log for debug panel
+const originalConsoleLog = console.log
+const originalConsoleWarn = console.warn
+const originalConsoleError = console.error
+
+function addDebugLog(type: string, args: any[]) {
+  const message = args.map(a => typeof a === 'object' ? JSON.stringify(a) : String(a)).join(' ')
+  const time = new Date().toLocaleTimeString()
+  debugLogs.value.push({ type, message, time })
+  // Keep only last 100 logs
+  if (debugLogs.value.length > 100) {
+    debugLogs.value.shift()
+  }
+}
+
+console.log = (...args) => {
+  originalConsoleLog.apply(console, args)
+  addDebugLog('log', args)
+}
+console.warn = (...args) => {
+  originalConsoleWarn.apply(console, args)
+  addDebugLog('warn', args)
+}
+console.error = (...args) => {
+  originalConsoleError.apply(console, args)
+  addDebugLog('error', args)
+}
+
+function copyDebugLogs() {
+  const text = debugLogs.value.map(l => `[${l.time}] [${l.type}] ${l.message}`).join('\n')
+  navigator.clipboard.writeText(text)
+  canvasStore.showNotification('Logs copied!', 'success')
+}
+
+function clearDebugLogs() {
+  debugLogs.value = []
+}
 const terminalRef = ref<InstanceType<typeof FloatingTerminal> | null>(null)
 const responseRef = ref<InstanceType<typeof FloatingResponse> | null>(null)
 const canvasStore = useCanvasStore()
@@ -265,7 +305,12 @@ watch(() => route.name, (newPage) => {
     <header class="app-header">
       <div class="header-left">
         <h1 class="logo">Agent UI</h1>
-        <ConnectionDropdown />
+        <button class="debug-btn" :class="{ active: showDebugConsole }" @click="showDebugConsole = !showDebugConsole" title="Debug Console">
+          <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+            <path d="M12 20h9"/><path d="M16.5 3.5a2.121 2.121 0 0 1 3 3L7 19l-4 1 1-4L16.5 3.5z"/>
+          </svg>
+          <span v-if="debugLogs.length" class="log-count">{{ debugLogs.length }}</span>
+        </button>
         <ComponentsDropdown />
         <ToolsDropdown />
         <PwaInstallBanner />
@@ -393,6 +438,36 @@ watch(() => route.name, (newPage) => {
 
     <!-- Floating Voice Input -->
     <FloatingVoice v-model="showVoice" />
+
+    <!-- Debug Console Panel -->
+    <Teleport to="body">
+      <Transition name="debug-slide">
+        <div v-if="showDebugConsole" class="debug-console">
+          <div class="debug-header">
+            <span>Debug Console ({{ debugLogs.length }})</span>
+            <div class="debug-actions">
+              <button @click="copyDebugLogs" title="Copy all">Copy</button>
+              <button @click="clearDebugLogs" title="Clear">Clear</button>
+              <button @click="showDebugConsole = false" title="Close">×</button>
+            </div>
+          </div>
+          <div class="debug-logs">
+            <div
+              v-for="(log, i) in debugLogs"
+              :key="i"
+              class="debug-log"
+              :class="log.type"
+              @click="navigator.clipboard.writeText(log.message)"
+            >
+              <span class="log-time">{{ log.time }}</span>
+              <span class="log-type">{{ log.type }}</span>
+              <span class="log-msg">{{ log.message }}</span>
+            </div>
+            <div v-if="!debugLogs.length" class="debug-empty">No logs yet</div>
+          </div>
+        </div>
+      </Transition>
+    </Teleport>
   </div>
 </template>
 
@@ -915,4 +990,156 @@ watch(() => route.name, (newPage) => {
     bottom: calc(10vh + 16px);
   }
 }
+
+/* Debug Console Button */
+.debug-btn {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+  padding: 4px 8px;
+  background: rgba(100, 100, 100, 0.2);
+  border: 1px solid rgba(255, 255, 255, 0.1);
+  border-radius: 6px;
+  color: #888;
+  font-size: 11px;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.debug-btn:hover {
+  background: rgba(100, 100, 100, 0.3);
+  color: #aaa;
+}
+
+.debug-btn.active {
+  background: rgba(59, 130, 246, 0.3);
+  border-color: rgba(59, 130, 246, 0.5);
+  color: #60a5fa;
+}
+
+.log-count {
+  background: #ef4444;
+  color: white;
+  font-size: 9px;
+  padding: 1px 5px;
+  border-radius: 10px;
+  min-width: 16px;
+  text-align: center;
+}
+
+/* Debug Console Panel */
+.debug-console {
+  position: fixed;
+  top: 50px;
+  left: 10px;
+  right: 10px;
+  bottom: 80px;
+  background: rgba(20, 20, 25, 0.98);
+  border: 1px solid rgba(255, 255, 255, 0.1);
+  border-radius: 12px;
+  z-index: 10002;
+  display: flex;
+  flex-direction: column;
+  backdrop-filter: blur(10px);
+  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
+}
+
+.debug-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 10px 14px;
+  background: rgba(255, 255, 255, 0.05);
+  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
+  border-radius: 12px 12px 0 0;
+  color: #ddd;
+  font-size: 12px;
+  font-weight: 600;
+}
+
+.debug-actions {
+  display: flex;
+  gap: 8px;
+}
+
+.debug-actions button {
+  padding: 4px 10px;
+  background: rgba(255, 255, 255, 0.1);
+  border: none;
+  border-radius: 4px;
+  color: #aaa;
+  font-size: 11px;
+  cursor: pointer;
+}
+
+.debug-actions button:hover {
+  background: rgba(255, 255, 255, 0.2);
+  color: #fff;
+}
+
+.debug-logs {
+  flex: 1;
+  overflow-y: auto;
+  padding: 8px;
+  font-family: 'Consolas', 'Monaco', monospace;
+  font-size: 11px;
+}
+
+.debug-log {
+  display: flex;
+  gap: 8px;
+  padding: 6px 8px;
+  border-radius: 4px;
+  cursor: pointer;
+  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
+}
+
+.debug-log:hover {
+  background: rgba(255, 255, 255, 0.05);
+}
+
+.debug-log:active {
+  background: rgba(59, 130, 246, 0.2);
+}
+
+.log-time {
+  color: #666;
+  flex-shrink: 0;
+}
+
+.log-type {
+  width: 40px;
+  flex-shrink: 0;
+  font-weight: 600;
+}
+
+.debug-log.log .log-type { color: #888; }
+.debug-log.warn .log-type { color: #f59e0b; }
+.debug-log.error .log-type { color: #ef4444; }
+
+.log-msg {
+  color: #ccc;
+  word-break: break-all;
+}
+
+.debug-log.warn .log-msg { color: #fcd34d; }
+.debug-log.error .log-msg { color: #fca5a5; }
+
+.debug-empty {
+  color: #666;
+  text-align: center;
+  padding: 40px;
+}
+
+/* Debug slide animation */
+.debug-slide-enter-active,
+.debug-slide-leave-active {
+  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.debug-slide-enter-from,
+.debug-slide-leave-to {
+  opacity: 0;
+  transform: translateY(-20px);
+}
 </style>