fix: Release the microphone to the browser when a call ends (#2685)

The microphone is connected when a call needs it and released the moment
that
call ends, so the browser stops reporting it as in use at hangup rather
than
`disconnect_seconds` later.

Existing configurations are migrated automatically by the visual editor.

 - Closes: #2681 

BREAKING CHANGE: `live.microphone.disconnect_seconds` is removed. The
microphone is released when a call ends, so there is no idle countdown
to
configure. Use `live.microphone.always_connected` to hold it open
instead.

BREAKING CHANGE: The `microphone_connect` and `microphone_disconnect`
actions
are removed. The card owns the microphone lifecycle; `microphone_mute`
and
`microphone_unmute` remain.

BREAKING CHANGE: `call` is removed from `live.microphone.auto_mute`,
whose
default is now `[]`. The microphone is muted when a call ends regardless
of
this option.

BREAKING CHANGE: `microphone_unmute` has no effect outside a call.
Nothing
carries the audio at any other time, so the request is ignored rather
than
opening the microphone.

tests/card-controller/actions/factory.test.ts

@@ -20,8 +20,6 @@ import { InternalCallbackAction } from '../../../src/card-controller/actions/act
 import { LogAction } from '../../../src/card-controller/actions/actions/log';
 import { MediaPlayerAction } from '../../../src/card-controller/actions/actions/media-player';
 import { MenuToggleAction } from '../../../src/card-controller/actions/actions/menu-toggle';
-import { MicrophoneConnectAction } from '../../../src/card-controller/actions/actions/microphone-connect';
-import { MicrophoneDisconnectAction } from '../../../src/card-controller/actions/actions/microphone-disconnect';
 import { MicrophoneMuteAction } from '../../../src/card-controller/actions/actions/microphone-mute';
 import { MicrophoneUnmuteAction } from '../../../src/card-controller/actions/actions/microphone-unmute';
 import { MoreInfoAction } from '../../../src/card-controller/actions/actions/more-info';
@@ -146,14 +144,6 @@ describe('ActionFactory', () => {
         MediaPlayerAction,
       ],
       [{ advanced_camera_card_action: 'menu_toggle' as const }, MenuToggleAction],
-      [
-        { advanced_camera_card_action: 'microphone_connect' as const },
-        MicrophoneConnectAction,
-      ],
-      [
-        { advanced_camera_card_action: 'microphone_disconnect' as const },
-        MicrophoneDisconnectAction,
-      ],
       [
         { advanced_camera_card_action: 'microphone_mute' as const },
         MicrophoneMuteAction,