Metronome sync toggle in widget, more Giuliani figures, chord pool list

- MetronomeWidget: the Phrase Mode switch now lives IN the widget as a
  Free/Sync toggle. Free = independent metronome (own clock, starts when
  toggled, with or without clicks). Sync = silent while idle, starts with
  the exercise (count-in included), pendulum mirrors the run's beats.
- Fixed double phraseBeatBus.emit (leftover from an earlier edit) that
  flipped the pendulum twice per beat — animation appeared frozen.
- Click decision unified: one sound checkbox governs both the widget and
  (in sync mode) the run's click scheduler. 'Click 1 after count-in' is
  musically the last count-in click (suppressed duplicate) — now with a
  working pendulum the offset is visible rather than confusing.
- Giuliani figures extended: p-i-m-a-m-i, p-a-p-i-m-a, a-m-i-p-i-m,
  m-i-a-m-i-m (six-note rolling/bass-skip/tremolo-adjacent figures).
- Arpeggio chord pool: togglable degree list (empty = all 7); functional
  and random progressions honor the pool; first bar draws a random chord
  from the pool.
- Tests 174/174.

src/types/SettingsTypes.ts

@@ -34,6 +34,9 @@ export interface RhythmSettings {
     bpm: number;
     seconds: number;
     active: boolean;
+    /** Phrase Mode: sync the metronome to the exercise (starts with it,
+     *  silent while idle) instead of running freely. */
+    syncToExercise: boolean;
     autoAdvance: boolean;
     sound: boolean;
     volume: number;
@@ -164,6 +167,7 @@ export const DEFAULT_SETTINGS: AppSettings = {
         bpm: 60,
         seconds: 5,
         active: false,
+        syncToExercise: true,
         autoAdvance: false,
         sound: true,
         volume: 0.5