feat: reports hub with highlights panel and detailed highlights page (#71)
- Transform /reports into a hub: highlights panel + 4 nav cards
- New service: reportService.getHighlights (parameterised SQL, deterministic
via referenceDate argument for tests, computes current-month balance, YTD,
12-month sparkline series, top expense movers vs previous month, top recent
transactions within configurable 30/60/90 day window)
- Extended types: HighlightsData, HighlightMover, MonthBalance
- Wired useHighlights hook with reducer + window-days state
- Hub tiles (flat naming under src/components/reports):
HubNetBalanceTile, HubTopMoversTile, HubTopTransactionsTile,
HubHighlightsPanel, HubReportNavCard
- Detailed ReportsHighlightsPage: balance tiles, sortable top movers table,
diverging bar chart (Recharts + patterns SVG), top transactions list with
30/60/90 window toggle; ViewModeToggle persistence keyed as
reports-viewmode-highlights
- New i18n keys: reports.hub.*, reports.highlights.*
- 5 new vitest cases: empty profile, parameterised queries, window sizing,
delta computation, zero-previous divisor handling
Fixes #71
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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