- Add aggressive drain loop in wait_for_event() when SKIP_RECORD_EVENTS
is true: poll 5ms + drain, repeat until quiet (up to 50ms). This closes
the timing gap where injected events arrived after drain_pipe returned
but before the flag was cleared in the next iteration.
- Remove verbose debug eprintln!/log_info from daemon (process_key,
replay, inject, toggle, window change, etc.)
- Add vietc-xrecord.c (C helper with XRecordEnableContext blocking mode)
- Update build-appimage.sh to compile and bundle C helper
