feat(transcription): add shared voice input support (#4232)

* feat(webui): add voice transcription input

* feat(webui): render ANSI output in code blocks

* refactor(webui): isolate voice recorder logic

* refactor(transcription): keep websocket ingress thin

* refactor(transcription): resolve channel audio settings on demand

* style(webui): neutralize voice waveform color

* feat(webui): add voice input tooltip

* feat(webui): add voice input keyboard shortcut

* fix(webui): distinguish voice shortcut platforms

* fix(webui): place voice button after model selector

* refactor(webui): share voice hold recording helpers

* fix(desktop): allow microphone voice input

* fix(webui): stabilize token usage month labels

* feat(webui): show voice input on settings overview

* fix(webui): label voice capability as recognition

* fix(webui): align capability overview status

* refactor(webui): isolate transcription socket handling

* fix(webui): soften silent voice waveform

* refactor(audio): clarify transcription service location

* docs(transcription): clarify audio and provider boundaries

* fix(exec): reduce session output polling flake

tests/channels/test_whatsapp_channel.py

@@ -271,8 +271,6 @@ async def test_lid_to_phone_cache_resolves_lid_only_messages():
 async def test_voice_message_transcription_uses_media_path():
     """Voice messages are transcribed when media path is available."""
     ch = WhatsAppChannel({"enabled": True, "allowFrom": ["*"]}, MagicMock())
-    ch.transcription_provider = "openai"
-    ch.transcription_api_key = "sk-test"
     ch._handle_message = AsyncMock()
     ch.transcribe_audio = AsyncMock(return_value="Hello world")