Introduced a new ButtonController responsible for handling the ReSpeaker (or generic GPIO) button:
Uses RPi.GPIO with BCM numbering and internal pull-up (PUD_UP), assuming an active-low button.
Starts a dedicated polling thread that:
Reads the GPIO level at a configurable interval (default 10 ms / 100 Hz),
Detects press and release transitions,
Computes press duration to classify short vs long press.
Short press behavior:
If state.tts_player.is_playing or state.music_player.is_playing:
Schedules state.satellite.stop() on the asyncio loop,
Also stops music via state.music_player.stop().
Otherwise:
Schedules state.satellite.manual_wakeup("button") to start a new voice interaction (wake-like behavior without needing a model instance).
Long press behavior:
Toggles mic mute using the existing event path:
Publishes set_mic_mute on the EventBus with {"state": not state.mic_muted}.
This ensures MicMuteHandler remains the single writer for mic state, updates mic_muted_event, and syncs MQTT mute state/LEDs.
Designed to fail gracefully:
If ButtonConfig.enabled is False or RPi.GPIO is unavailable, logs a message and disables button support without affecting the rest of the system.
