Four scheduled-timer actions extracted into `createScheduleActions`
(`src/store/scheduleActions.ts`):
- `schedulePauseIn` / `scheduleResumeIn` — clamp the delay to ≥ 500 ms,
store absolute target + start timestamps (for the countdown UI),
and arm a single-shot timer.
- `clearScheduledPause` / `clearScheduledResume` — cancel the timer
and blank the timestamps.
Pure code-move. playerStore.ts: 1030 → 991 LOC (−39, first sub-1000
state since Phase E started).
Frank Stellmacher