fix: setup voice before recv_loop, drain responses, check ws state

Root cause: recv_loop started before open_voice completed, bridge
connection died during UI transition. Now setup completes first.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

relay.py

@@ -100,14 +100,25 @@ class BridgeClient:
         except Exception as e:
             log.error(f"Bridge recv error: {e}")
 
+    async def _send_and_wait(self, cmd, wait_secs=1):
+        """Send command and consume the response."""
+        self.send_cmd(cmd)
+        await asyncio.sleep(wait_secs)
+        # Drain any pending responses
+        while True:
+            try:
+                ftype, data = await asyncio.wait_for(self._recv_frame(), timeout=0.5)
+                if ftype == 1:
+                    msg = json.loads(data.decode())
+                    log.info(f"Bridge: {msg}")
+            except asyncio.TimeoutError:
+                break
+
     async def setup_voice(self):
         """Open voice chat, start capture, enable inject."""
-        self.send_cmd({"cmd": "open_voice"})
-        await asyncio.sleep(3)
-        self.send_cmd({"cmd": "start"})
-        await asyncio.sleep(1)
-        self.send_cmd({"cmd": "inject_on"})
-        await asyncio.sleep(0.5)
+        await self._send_and_wait({"cmd": "open_voice"}, wait_secs=3)
+        await self._send_and_wait({"cmd": "start"}, wait_secs=1)
+        await self._send_and_wait({"cmd": "inject_on"}, wait_secs=0.5)
         log.info("Voice bridge ready (inject mode)")
 
     async def close(self):
@@ -144,15 +155,15 @@ class Relay:
         self.opus_decoder = opuslib.Decoder(ESP_SAMPLE_RATE, 1)
         self.opus_encoder = opuslib.Encoder(ESP_SAMPLE_RATE, 1, opuslib.APPLICATION_AUDIO)
 
-        # Connect to voice bridge
+        # Connect to voice bridge and setup voice chat first
         self.bridge = BridgeClient(self.bridge_host, self.bridge_port)
         await self.bridge.connect()
+        await self.bridge.setup_voice()
+
+        # Now start receiving speaker audio
         self.bridge.on_speaker_frame = self._on_speaker_frame
         recv_task = asyncio.create_task(self.bridge.start_recv_loop())
 
-        # Setup voice chat
-        await self.bridge.setup_voice()
-
         try:
             async for message in websocket:
                 if isinstance(message, str):
@@ -226,7 +237,7 @@ class Relay:
 
     async def _on_speaker_frame(self, pcm_bytes):
         """Receive speaker PCM from bridge, resample, encode Opus, send to ESP32."""
-        if not self.ws:
+        if not self.ws or self.ws.closed:
             return
         try:
             samples = np.frombuffer(pcm_bytes, dtype=np.int16)