Issue 3 of overnight-2026-06-01-bilan-axe-vehicule. Builds the tracking UI
on top of the merged data layer (#202) and input UI (#203).
- Service: getSnapshotTotalsByVehicleAndDate(range) mirrors the by-category
aggregation with GROUP BY COALESCE(a.vehicle_type, 'none') so null-envelope
accounts land in a single 'none' bucket (never a SQL NULL key). Add
vehicle_type to getAccountsLatestSnapshot SELECT + type.
- useBalanceOverview: new groupAxis ('class'|'vehicle') state ORTHOGONAL to
chartMode; loads byVehicle alongside byCategory. Default groupAxis='class'.
- BalanceEvolutionChart + BalancePage: stacked-mode sub-toggle 'Par classe
d'actif' (default) / 'Par enveloppe'. Vehicle legend reuses the #203
vehicleType.* labels; the 'none' bucket uses balance.vehicle.none.
- BalanceAccountsTable: 4 return columns collapsed by default with a toggle,
persisted across sessions via userPreferenceService key balance_show_returns.
- i18n FR/EN: balance.chart.axis.{byAssetClass,byVehicle}, balance.vehicle.none,
balance.accountsTable.toggleReturns.{show,hide} (+ axisLegend aria label).
Tests: npm run build green (0 type errors); vitest 3314 passed. Added 5
service tests for the 'none' bucket + mixed envelopes + date range.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
