Drops the tc-enable, heater-activate and stirrer-activate checkboxes and all associated state, signal connections, initial-sync flags, and channel-handler logic. Regenerates main_window.py from the updated .ui. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DF16nV2ispNw1C9SbvqbRQ