Three new components composed under a new BalancePage at /balance:
- BalanceOverviewCard — latest aggregate net worth, Δ% vs the
previous chronological snapshot (rendered as "—" when only
one snapshot exists), 60-day staleness warning, and a
"+ Nouveau snapshot" CTA pointing at /balance/snapshot.
- BalanceEvolutionChart — Recharts-based line / stacked-area
toggle. Line mode plots SUM(value) per snapshot_date with a
single primary-coloured stroke. Stacked mode transposes the
byCategory series into one Area per category_key with a
fixed 10-color palette indexed deterministically. Tooltip
formats CAD via Intl.NumberFormat.
- BalanceAccountsTable — one row per active account with name,
category label, latest value, and Δ% over the active period
(latest_value vs the period anchor). Returns columns
(3M / 1Y / since-creation / unadjusted) reserved for #142
with a TODO marker. Action menu includes a disabled "Detail"
placeholder + functional "Archive" wired through reload().
BalancePage composes the three with an inline period selector
(3M / 6M / 1A / 3A / Tout) and chart-mode toggle, both styled
as segmented controls. State flows through useBalanceOverview.
Route /balance registered before /balance/accounts in App.tsx.
Refs: #141
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
