Always show master deadzone input with read/set controls; apply bulk slave
changes via slaves_only without changing the master's BMA456.
Co-authored-by: Cursor <cursoragent@cursor.com>
Serve polls the master over UART and pushes live state via WebSocket;
reopens the serial port when the device is unplugged and comes back.
Co-authored-by: Cursor <cursoragent@cursor.com>