feat(voice): "Say <stop-phrase> to end the voice chat" notice on voice-mode start (CLI/TUI/desktop, i18n)

One owner for the wording: voice_stop_hint() in tools/voice_mode.py —
sources the phrase from voice.stop_phrases (first entry) so a custom
phrase renders correctly, and returns "" when the feature is disabled
(stop_phrases: []) so no surface shows a hint.

- CLI: printed in /voice on output (style-matched dim notice).
- TUI: voice.toggle action=on now carries stop_hint; the Ink client
  renders it in the "Voice mode enabled" block (older gateways omit
  the field — no hint, no crash).
- Desktop: the renderer voice loop never touches tools/voice_mode.py,
  so the phrase is read from config (voice.stop_phrases → $voiceStopPhrase
  store, seeded in use-hermes-config) and shown as an info toast when a
  voice conversation starts. i18n: en/ja/zh/zh-hant/ar.

cli.py

@@ -12283,6 +12283,15 @@ class HermesCLI(CLIAgentSetupMixin, CLICommandsMixin, CLIBillingMixin):
         _ptt_display = self._voice_record_key_label()
         _cprint(f"\n{_ACCENT}Voice mode enabled{tts_status}{_RST}")
         _cprint(f"  {_DIM}{_ptt_display} to start/stop recording{_RST}")
+        # Spoken-stop hint sourced from voice.stop_phrases (first entry); the
+        # helper returns "" when stop phrases are disabled — show no hint then.
+        try:
+            from tools.voice_mode import voice_stop_hint
+            _stop_hint = voice_stop_hint()
+        except Exception:
+            _stop_hint = ""
+        if _stop_hint:
+            _cprint(f"  {_DIM}{_stop_hint}{_RST}")
         _cprint(f"  {_DIM}/voice tts  to toggle speech output{_RST}")
         _cprint(f"  {_DIM}/voice off  to disable voice mode{_RST}")