Mobile width fix, 6/8 crash fix, more arpeggio+Giuliani variants

- PhraseSheetMusic: min width per bar scales with notation density
  (16ths 320px, 8ths 260px, quarters 210px) — narrow screens wrap into
  more rows instead of clipping notes off-screen.
- 6/8 crash fixed at the root: melody templatesFor had no 6/8 templates
  (empty pool -> pick on empty array). Added 6/8 template sets for levels
  1/2 plus an empty-pool fallback guard so generators can never pick from
  an empty array again (any meter/level combination stays playable).
- More arpeggio broken-chord figures: 1-3-5-3, 1-2-1-3-2-1, 1-5-4-5-3-5,
  1-3-2-5-3-2.
- More Giuliani patterns: p-i-a-i (wide), p-m-a-m-i, p-i-m-a-m-i (waltz
  feel), p-i-m-a-i-a.
- Tests 179/179.

src/music/arpeggioGenerator.ts

@@ -21,7 +21,11 @@ export type ArpeggioPattern =
     | '1321'   // root-fifth-third-root
     | '1325'   // root-fifth-third-octave
     | '1535'   // root-octave-fifth-octave
-    | '12353'; // root-third-fifth-octave-fifth
+    | '12353'  // root-third-fifth-octave-fifth
+    | '121321' // rolling thirds (root-third-root-fifth-third-root)
+    | '1353'   // root-third-fifth-third
+    | '15453'  // root-octave-fifth-octave-fifth-octave
+    | '132532';// long broken-chord wave
 export type ArpeggioCoverage = 'one-octave' | 'two-octave';
 /** How the chord per bar is chosen in sequence mode. */
 export type ArpeggioProgression = 'random' | 'functional' | 'diatonic-cycle';
@@ -61,6 +65,10 @@ export const PATTERN_LABELS: Record<ArpeggioPattern, string> = {
     '1325': '1-3-2-5(8)',
     '1535': '1-5-3-5(8)',
     '12353': '1-2-3-5-3',
+    '121321': '1-2-1-3-2-1',
+    '1353': '1-3-5-3',
+    '15453': '1-5-4-5-3-5',
+    '132532': '1-3-2-5-3-2',
 };
 
 /**
@@ -77,6 +85,10 @@ const BROKEN_FIGURES: Record<string, number[]> = {
     '1325': [0, 2, 1, 3],
     '1535': [0, 3, 2, 3],
     '12353': [0, 1, 2, 3, 2],
+    '121321': [0, 1, 0, 2, 1, 0],
+    '1353': [0, 1, 2, 1],
+    '15453': [0, 3, 2, 3, 2, 3],
+    '132532': [0, 2, 1, 3, 2, 1],
 };
 
 /** pc of a spelled degree (step letter + alter). */