- Phrase Mode (sync to metronome): the run's scheduler is the single click
source (with count-in); the metronome widget is muted and its pendulum
mirrors the run's beats via the new phraseBeatBus (audio-timestamp
scheduled). No more double clicks; clicks only while the run is active
(phraseRunBus gates the widget's own ticking).
- Schedule entries now carry continuous beat index + accent flag (downbeats
accented, count-in beat 1 accented).
- 'At your pace': optional click via the metronome toggle (kept explicit).
- Metronome widget: gate prop; in gated mode it listens to the beat bus
instead of running its own scheduler.
