The two hierarchical comparable reports — real-vs-real Compare and
real-vs-budget — now let the user collapse or expand each top-level
category's sub-categories. Groups start collapsed by default (#260): only
the parent's subtotal row shows until the user expands it, and each expanded
group is remembered per report.
- New pure module utils/collapsibleRows.ts (visibility filter, group-key
extraction, expanded-set (de)serialization) + useCollapsibleGroups hook
wrapping the localStorage-persisted expanded set. Persisting the *expanded*
set (not the collapsed one) makes "all collapsed" the zero/default state.
- A chevron toggles each top-level parent; an "Expand all / Collapse all"
button toggles them together. Section subtotals and result lines keep
summing every leaf, so collapsing never changes any total.
- Accessors mirror each table's own depth/parent logic so hidden rows are
exactly a group's indented descendants.
- i18n keys reports.collapse.{expandAll,collapseAll} (FR/EN); CHANGELOG.
CategoryOverTimeTable (Trends -> by category) is intentionally left out: its
rows are a flat top-N category list with no parent/child hierarchy to fold.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
