fix(voice): bare stop phrase ends the voice chat on every surface, spoken or typed

Saying OR typing a configured stop phrase (voice.stop_phrases, default
"stop") now ends the voice chat everywhere, not just classic CLI PTT:

- hermes_cli/voice.py: new explicit on_stop_phrase callback through
  start_continuous/stop_continuous. The force-transcribe path previously
  DISCARDED the stop phrase silently — with auto_restart=False the client
  re-arms the next capture, so the conversation never ended. Both halt
  paths now fire on_stop_phrase (fallback: on_silent_limit for legacy
  callers) as user intent, distinct from the no-speech timeout.
- tui_gateway/server.py: voice.record wires on_stop_phrase and emits
  voice.transcript {stop_phrase: true} after flipping HERMES_VOICE(_TTS)
  off and stopping streaming TTS — same teardown as /voice off. The TTS
  barge-in monitor stop-checks its transcript too. prompt.submit consumes
  a TYPED bare stop phrase at the server-side choke point when voice mode
  is on (returns {voice_stopped: true}, no turn starts).
- ui-tui: voice.transcript {stop_phrase} ends voice mode with a clear
  'voice chat ended' notice (distinct from the no-speech-limit message);
  submitPrompt releases the busy latch on a consumed voice_stopped reply.
- cli.py: _typed_voice_stop in process_loop — typing a bare stop phrase
  while voice mode/continuous is active ends voice mode instead of
  sending 'stop' to the agent; typed 'stop' outside voice mode is
  unchanged. Voice transcripts skip the check (already stop-checked).
- desktop: interceptsTypedVoiceStop — the composer's onSubmit ends the
  live voice conversation (same path as clicking end on the pill) when a
  bare stop command is typed with no attachments; renderer-owned loop, so
  handled client-side like the existing spoken isVoiceStopCommand.
- tools/voice_mode.py: transcribe_recording never lets the Whisper
  hallucination filter swallow a configured stop phrase (e.g. 'bye'
  configured as a stop phrase is both a hallucination-blocklist entry and
  a stop phrase — stop-phrase check now wins).

Tests: continuous-loop signal (sabotage-verified), force-transcribe stop
signal + legacy fallback, hallucination-filter ordering, typed-stop CLI
unit tests (voice on/off/longer text), prompt.submit typed-stop gateway
tests, TUI vitest for stop_phrase event handling, desktop vitest for the
typed-stop interceptor.

tools/voice_mode.py

@@ -1187,10 +1187,18 @@ def transcribe_recording(wav_path: str, model: Optional[str] = None) -> Dict[str
     if not result.get("success") and "File too large" in result.get("error", ""):
         result = _transcribe_wav_in_chunks(wav_path, model=model, max_file_size=MAX_FILE_SIZE)
 
-    # Filter out Whisper hallucinations (common on silent/near-silent audio)
-    if result.get("success") and is_whisper_hallucination(result.get("transcript", "")):
-        logger.info("Filtered Whisper hallucination: %r", result["transcript"])
-        return {"success": True, "transcript": "", "filtered": True}
+    # Filter out Whisper hallucinations (common on silent/near-silent audio).
+    # A configured voice-chat stop phrase is checked FIRST and always survives:
+    # phrases like "bye" or "okay" overlap the hallucination blocklist/repeat
+    # regex, and swallowing them here would make saying "bye" (when configured
+    # as a stop phrase) silently fail to end the voice chat.
+    if result.get("success"):
+        raw_transcript = result.get("transcript", "")
+        if is_whisper_hallucination(raw_transcript) and not is_voice_stop_phrase(
+            raw_transcript
+        ):
+            logger.info("Filtered Whisper hallucination: %r", result["transcript"])
+            return {"success": True, "transcript": "", "filtered": True}
 
     # Providers that flag no_speech (empty transcript) failed to hear words,
     # not to transcribe — treat like silence so the voice loop re-listens