Generalize the report category collapse from level-1-only to every hierarchy
level, on the three hierarchical report tables (real-vs-real Compare,
real-vs-budget Compare, Trends by category). Visibility is now decided by an
ancestor walk, not by row adjacency, so it is independent of row order (the
level-ordered budget grid emits a non-DFS order).
- collapsibleRows: rewrite visibleRows as an ancestor walk (a row is hidden iff
any ancestor is collapsed); add parentKeyOf + injective `p:` keys;
collapsibleKeys returns all parents (any depth); extract the pure, tested
isCollapsedFor polarity helper; MAX_TREE_DEPTH cycle guard.
- useCollapsibleGroups: persist in user_preferences (per-profile, destroyed with
the profile) instead of localStorage; storageKey nullable (no persistence);
options.defaultExpanded; async hydration (no flash); collapseAll(rows).
- 3 tables: fix BOTH gates (collapsed flag + button) isTopParent -> isParent, add
parentKeyOf accessors, aria-level on parent rows.
- Delete dead CategoryTable.tsx (0 imports).
- Tests: rewrite collapsibleRows.test.ts (BFS==DFS masking, cycle guard,
cross-section ancestor, "(direct)" leaf, polarity); extend overTimeTableModel
fixture to 3 levels with cascade assertions.
Collapse stays purely visual: subtotals and result lines are computed from raw
rows, never from visible rows.
Resolves#288
Generated autonomously by /autopilot run of 2026-07-15
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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