fix: address critical review issues in voice overlay

- Clean up voice sessions on WebSocket disconnect (prevents timer leak)
- Guard against missing LLM config in voice_stop send path
- Return overlay to idle on goal_failed (prevents stuck UI)

android/app/src/main/java/com/thisux/droidclaw/connection/CommandRouter.kt

@@ -79,6 +79,7 @@ class CommandRouter(
             }
             "goal_failed" -> {
                 currentGoalStatus.value = GoalStatus.Failed
+                ConnectionService.instance?.overlay?.returnToIdle()
                 Log.i(TAG, "Goal failed: ${msg.message}")
             }
 

server/src/ws/device.ts

@@ -410,7 +410,13 @@ export async function handleDeviceMessage(
         .where(eq(llmConfig.userId, userId))
         .limit(1);
 
-      const groqKey = configs[0]?.apiKey ?? "";
+      if (configs.length === 0 || !configs[0].apiKey) {
+        handleVoiceCancel(deviceId);
+        sendToDevice(ws, { type: "transcript_final", text: "" });
+        break;
+      }
+
+      const groqKey = configs[0].apiKey;
       const transcript = await handleVoiceSend(ws, deviceId, groqKey);
 
       if (transcript) {
@@ -488,6 +494,7 @@ export function handleDeviceClose(
     active.abort.abort();
     activeSessions.delete(deviceId);
   }
+  handleVoiceCancel(deviceId);
   sessions.removeDevice(deviceId);
 
   // Update device status in DB