Add motif/stem_note display and offset note hierarchy

- parseAstLog: abort on depth jump >1 or missing slot (depth>0)
- buildStemNote: full clause tree (notes/pauses/stacks), editable fields
- buildClause: replaces buildCluster; filters nested clause.chain silently
- buildMotif: builds from voice.motif; sets isStatic
- buildOffset: uses buildStemNote; drops old clusters/chains arrays
- buildVoice: motifs are now objects, not label strings
- PaneSubObjects: static motifs before offsets; motif/offset→stem_note drill-down
- PaneFO: motif + stem_note FO cases; unknownProps display helper
- PaneCP: motif + stem_note shortView cases
- test-parser.mjs: 21 new synthetic tests for motif/clause/stack/guards

static/components/PaneSubObjects.js

@@ -51,12 +51,32 @@ export const PaneSubObjects = {
             }
             if (node.type === 'bar') {
                 return Object.entries(node.voices).map(([name, v]) => ({
-                    kind: 'voice', node: v, label: name, hasChildren: v.offsets.length > 0,
+                    kind: 'voice', node: v, label: name,
+                    hasChildren: v.offsets.length > 0 || v.motifs.some(m => m.isStatic),
                 }));
             }
             if (node.type === 'voice') {
-                return node.offsets.map((o, idx) => ({
-                    kind: 'offset', node: o, label: `tick ${o.tick ?? idx}`, hasChildren: false,
+                return [
+                    ...node.motifs
+                        .filter(m => m.isStatic)
+                        .map(m => ({ kind: 'motif', node: m, label: m.label, hasChildren: m.stemNotes.length > 0 })),
+                    ...node.offsets.map((o, idx) => ({
+                        kind: 'offset', node: o, label: `tick ${o.tick ?? idx}`, hasChildren: o.stemNotes.length > 0,
+                    })),
+                ];
+            }
+            if (node.type === 'motif') {
+                return node.stemNotes.map(sn => ({
+                    kind: 'stem_note', node: sn,
+                    label: `pitch ${sn.pitch}${sn.clauses.length ? ` (${sn.clauses.length} clause${sn.clauses.length > 1 ? 's' : ''})` : ''}`,
+                    hasChildren: false,
+                }));
+            }
+            if (node.type === 'offset') {
+                return node.stemNotes.map(sn => ({
+                    kind: 'stem_note', node: sn,
+                    label: `pitch ${sn.pitch}${sn.clauses.length ? ` (${sn.clauses.length} clause${sn.clauses.length > 1 ? 's' : ''})` : ''}`,
+                    hasChildren: false,
                 }));
             }
             return [];