… TTS

TalkModeManager is instantiated lazily in NodeRuntime and drives ElevenLabs
streaming TTS for all assistant responses when the voice screen is active.
MicCaptureManager continues to own STT and chat.send; TalkModeManager is
TTS-only (ttsOnAllResponses = true, setEnabled never called).

- talkMode.ttsOnAllResponses = true when mic is enabled or voice screen active
- Barge-in: tapping the mic button calls stopTts() before re-enabling mic
- Lifecycle: PostOnboardingTabs LaunchedEffect + VoiceTabScreen onDispose both
  call setVoiceScreenActive(false) so TTS stops cleanly on tab switch or
  app backgrounding
- applyMainSessionKey wires the session key into TalkModeManager so it
  subscribes to the correct chat session for TTS

…oice

ChatController:
- final/aborted/error run events now trigger a history refresh regardless of
  whether the runId is in pendingRuns; only delta events require the run to be
  tracked (prevents voice-initiated responses from being silently dropped)

MicCaptureManager:
- Don't auto-send on onResults silence detection — accumulate transcript
  segments and send when mic is toggled off, giving the recognizer time to
  finish processing buffered audio
- Capture any partial live transcript if no final segments arrived (2s drain
  window before stop)
- Join multi-segment transcripts with sentence-ending punctuation to avoid
  run-on text sent to the gateway

…cooldown

Bug fixes:
- @synchronized on ElevenLabsStreamingTts.sendText/finish to prevent
  sentFullText/sentTextLength races across OkHttp and caller threads
- Pre-set pendingRunId via onRunIdKnown callback before chat.send to
  eliminate race where gateway events arrive before runId is stored
- Track drain coroutine as Job; cancel prior on rapid mic toggle to
  prevent duplicate TTS and stale transcript sends
- Mic button disabled during 2s drain cooldown (micCooldown StateFlow)

Codex review fixes:
- Gate agent streaming TTS on sessionKey to prevent cross-session
  audio leaks (P1)
- Clear ElevenLabs credentials when talk.provider is not elevenlabs;
  gate streaming TTS on activeProviderIsElevenLabs (P2)

System TTS fallback fixes:
- Null streamingTts immediately in finishStreamingTts so next response
  gets a fresh TTS instance
- Add hasReceivedAudio flag to ElevenLabsStreamingTts to detect when
  WebSocket connects but returns no audio (invalid key, network error)
- Fall back to playTtsForText when streaming TTS produced no audio
- Track ttsJob to cleanly cancel prior playTtsForText on new response
- Re-throw CancellationException instead of cascading into fallback
  attempts that also get cancelled

- Codex P1: streamAndPlayMp3 was computed but never called after PCM
  failure. Now properly invoked as fallback.
- Codex P2: MicCaptureManager.speakAssistantReply now skipped when
  TalkModeManager.ttsOnAllResponses is active, preventing both
  pipelines from speaking the same assistant reply.

- Codex P1: setSpeakerEnabled now syncs talkMode.setPlaybackEnabled
  so muting the speaker works when ttsOnAllResponses is active.
- Codex P2: abandonAudioFocus() called in stopSpeaking to prevent
  audio focus leak after TTS completes or is interrupted.

Agent events arrive on multiple threads concurrently. A stale event
with shorter accumulated text was falsely triggering 'text diverged',
causing the streaming TTS to restart with a new WebSocket — resulting
in multiple simultaneous ElevenLabs connections (2-3 voices) and
eventual system TTS fallback when hasReceivedAudio was false.

Fix: if sentFullText.startsWith(fullText), the event is stale (we
already have this text), not diverged. Accept and ignore it.

…ailure

- Codex P2: drain coroutine now only clears drainingTts if it's the
  same instance (=== check), preventing a newer drain from being
  unreachable by stopTts.
- Codex P2: set stopped=true on WebSocket onFailure so subsequent
  sendText calls are rejected and stale state doesn't persist.

…seau)