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fix(studio): TanStack route parity fixes from Next comparison audit (#48028)

Audited every TanStack route (~300 files) against its Next.js
pages-router counterpart — layout wrapping, root providers, API routes,
and deploy config — and fixed the divergences found. Same bug class as
#48024, plus a few setup-level gaps.

**Fixed (user-visible):**
- `routes/__root.tsx` was missing `TimezoneProvider` + the
`TimestampInfoProvider` bridge, so the stored timezone preference was
silently ignored app-wide (timestamps always rendered in browser-local
time)
- `routes/_auth.tsx` wrapped all 10 auth pages in `AuthenticationLayout`
(status banners + extra full-screen scroll container); in Next only
`/sign-in` has it via getLayout. The parent is now a passthrough and
sign-in wraps at the leaf
- `routes/project/$ref/integrations.tsx` hardcoded
`ProjectIntegrationsLayout`; the Next pages use
`ProjectIntegrationsLayoutDispatch`, which switches to the Marketplace
layout when that flag is enabled
- `GlobalShortcuts` wasn't mounted, so the shortcuts-reference sheet
(`?`) and its command-menu entry were unreachable
- `routes/join.tsx` added a full-screen wrapper the Next page doesn't
have (double `min-h-screen` around `InterstitialLayout`)

**Fixed (behavior/config):**
- ConfigCat flags lost the `plan` custom attribute, so plan-targeted
flags could evaluate differently
- `vercel.ts`: `api/server.js` had no `maxDuration` (Next sets up to
300s per route — stripe-sync, AI streaming); added the
`/.well-known/vercel/flags` rewrite + JSON content-type (Flags Explorer
endpoint previously fell through to the HTML shell); added
`img`/`favicon` cache-control headers
- `routes/api/v1/.../functions/$slug/body.ts` (bespoke reimplementation)
dropped `apiWrapper`'s global catch — errors now get Sentry capture +
the same 500 `{ error }` body
- Reverted migration drift in `__root.tsx`: tooltip `delayDuration` 0 →
Radix default (matching Next), `og:image` back to `supabase-og.png`
- lodash ... (continued)

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