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

nanobot/webui/settings_routes.py

@@ -33,6 +33,7 @@ from nanobot.webui.settings_api import (
     update_model_configuration,
     update_network_safety_settings,
     update_provider_settings,
+    update_transcription_settings,
     update_web_search_settings,
 )
 
@@ -100,6 +101,8 @@ class WebUISettingsRouter:
             return self._handle_settings_web_search_update(request)
         if path == "/api/settings/image-generation/update":
             return self._handle_settings_image_generation_update(request)
+        if path == "/api/settings/transcription/update":
+            return self._handle_settings_transcription_update(request)
         if path == "/api/settings/network-safety/update":
             return self._handle_settings_network_safety_update(request)
         if path == "/api/settings/cli-apps":
@@ -275,6 +278,15 @@ class WebUISettingsRouter:
             return self._error_response(e.status, e.message)
         return self._json_response(self._with_restart_state(payload, section="image"))
 
+    def _handle_settings_transcription_update(self, request: WsRequest) -> Response:
+        if not self._authorized(request):
+            return self._unauthorized()
+        try:
+            payload = update_transcription_settings(self._query(request))
+        except WebUISettingsError as e:
+            return self._error_response(e.status, e.message)
+        return self._json_response(self._with_restart_state(payload))
+
     def _handle_settings_network_safety_update(self, request: WsRequest) -> Response:
         if not self._authorized(request):
             return self._unauthorized()