FE-1 foundation for #2036. app/v2/page.tsx now owns data: ParamsPanel form ->
useEstimateMutation, restore-by-id via window.location.search (mirrors v1, avoids
useSearchParams Suspense build break), sub-hooks useStreetDeals/useEstimateHouseAnalytics;
loading/empty/insufficient/error states (honest placeholders, no fixtures-as-real).
New components/trade-in/v2/mappers.ts: pure AggregatedEstimate(+street-deals/analytics)
-> fixture-shape transforms — 3 price tiers (asking/expected_sold/DKP), ranges, scatter,
7 source slots, summary. CV + per-source counts are FE-approx pending BE-1 (#2043).
ParamsPanel -> controlled form (onSubmit/isPending/error/initialValues). ResultPanel/
ObjectSummary/HeroBar/Footer accept a composite data prop defaulting to the existing
fixture (pixel-perfect markup unchanged). next build green (/v2 34 kB).
