0.0.22

Single-instance lock + restart watcher on wake

After an update users replace the .app while the old copy still runs and
reopen it; macOS could leave TWO instances alive, both polling and
fighting over the shared tray/popover/log, leaving the visible window
with a dead watcher (no Split/Stop buttons) until a manual kill+relaunch.

- requestSingleInstanceLock: a second instance quits immediately and
  tells the first to surface its popover, so there is always exactly one
  watcher — no manual relaunch needed after updates.
- powerMonitor 'resume': restart the meeting watcher on wake, since sleep
  can leave the detectors stale.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>