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/components/Controls.tsx

@@ -181,6 +181,7 @@ export const Controls: React.FC<ControlsProps> = ({ currentPitch }) => {
                         rhythm={settings.rhythm}
                         onUpdate={updateRhythm}
                         showAutoAdvance={!inPhraseMode}
+                        syncMode={inPhraseMode ? 'option' : null}
                         gate={inPhraseMode ? phraseRunActive : null}
                     />
                 </div>