- Add CATEGORY_TYPES_ALL constant and isOverBudget direction-aware helper
- Derive groupedSections via useMemo (filters empty groups, computes totals)
- Initialize openSections state with smart defaults (over-budget expanded)
- State resets on month navigation via key={budgetId} on DashboardContent
- Insert CollapsibleSections between chart grid and QuickAdd
- Add skeleton placeholders for collapsible sections area in DashboardSkeleton
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Add collapsible-open/close keyframes and CSS animation tokens to index.css
- Add dashboard.sections and dashboard.carryoverIncludes keys to en.json and de.json
- Add optional subtitle/subtitleClassName props to StatCard
- Extend SummaryStrip balance prop with carryoverSubtitle/carryoverIsNegative
- Compute and pass carryover subtitle from DashboardContent to SummaryStrip
- IncomeBarChart: vertical grouped bars (budgeted muted, actual vivid)
- SpendBarChart: horizontal bars via layout="vertical" with swapped axes
- Both use per-cell conditional fill for over-budget red accent
- Both use ChartContainer + ChartConfig for CSS variable theming
- Both handle empty data with ChartEmptyState placeholder
- ChartLegend and ChartTooltip with formatted currency values
- Donut chart with innerRadius/outerRadius, center total label via formatCurrency
- Active sector expansion on hover via activeShape + Sector
- Custom legend below chart with color dots and formatted amounts
- CSS variable fills via ChartConfig (no hardcoded hex values)
- Empty state: ChartEmptyState placeholder when no data
- Zero-amount state: neutral muted ring with $0 center label
- ChartEmptyState shared component created (Rule 3: blocking dependency from Plan 01)
- useMonthParam reads/writes month URL search param with YYYY-MM fallback
- navigateMonth handles year rollover via Date constructor
- MonthNavigator renders prev/next arrows with Select dropdown
- Dropdown lists available budget months with locale-aware formatting
