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Marc-André Bombeck
cb9d61a311
The measured first-load gap on / was never the server: FCP painted the SSR shell at ~1.8 s but LCP landed at ~5.5 s (mobile-throttled) because the tiles waited for JS download + hydrate + a CLIENT-side snapshot fetch — while /api/dashboard/snapshot answers in ~8 ms server-side. src/app/page.tsx is now a thin RSC wrapper: it runs the same cached snapshot read the API route uses (extracted to src/lib/dashboard/snapshot-read.ts, one shared SWR cell for both readers) and hands the result to TanStack via HydrationBoundary + dehydrate, so the first HTML carries real tile data and the mounted cell starts warm (staleTime 60 s, refetchOnMount false — no double fetch). Query keys come only from the central factory (dashboardSnapshot(locale) + the dashboardWidgets seed the client cell already performs); the payload is JSON-round-tripped so the hydrated shape is byte-equal to the wire shape. Fail-soft: no session or any builder error renders the page exactly as before. The 1,727-line client page moves unchanged to src/app/page-client.tsx; no component-tree rewrite. Companion: the documented bundle tooling was dead on Turbopack (ANALYZE=1 silent no-op, bundle-report read a webpack-only JSON), so H2/H3-class regressions shipped invisibly. scripts/check-bundle-budget.mjs derives per-route gzip totals from the Turbopack client-reference manifests + rootMainFiles, prints the report (pnpm bundle-report), and enforces bundle-budget.json (pnpm bundle-check): per-route caps, total-client-JS cap, a recharts-duplication guard (fingerprint count must stay 1), and a catalog guard (no message catalog referenced by any route manifest). Wired into the existing e2e workflow after next build. H4