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fix(studio): TanStack post-merge fixes — Monaco loader, fonts, CSP (from #46424) (#47657)

Post-merge fixes for the TanStack Start migration (#46424) — things that
broke on the TanStack build as master evolved under the migration
branches. Kept on their own branch off master rather than piling onto
the E2E-matrix PR (#47119); all land on master and cascade up to S6 +
the big PR.

Common theme: a master PR changed something the Next pipeline handles
via `next/font` / `pages/_app.tsx` / `next.config.ts`, but the
hand-rolled TanStack equivalent (`routes/__root.tsx`,
`styles/fonts.css`, `vercel.ts`) wasn't updated to match — invisible on
the Next deploy, broken only on TanStack.

---

## 1. Monaco loader path (#47182)

#47182 re-nested the served Monaco assets from a flat
`public/monaco-editor/` layout into `public/monaco-editor/vs/` and
updated `pages/_app.tsx`, but `routes/__root.tsx` still pointed
`loader.config` at the old path, so `loader.js` 404'd and **no Monaco
editor mounted anywhere in the TanStack build**. Now mirrors the Next
config (`${origin}${BASE_PATH}/monaco-editor/vs`, window-guarded for
SSR). Was failing the whole `tanstack` E2E shard on #47119.

## 2. Inter + Manrope fonts (#47306)

#47306 renamed Tailwind's sans var `--font-custom` → `--font-sans` and
added `--font-heading` (Manrope), set via `next/font` on Next.
`fonts.css` still only set the now-ignored `--font-custom`, so the body
fell back to the theme's system chain (`Circular, custom-font,
Helvetica…`) at weight 450 — that's the "Inter weights look wrong".
Manrope was missing entirely.

- Wire `--font-sans` (Inter) + `--font-heading` (Manrope) to match
`next/font`.
- **Vendor all three families** (Inter, Manrope, Source Code Pro) via
`@font-face` so nothing depends on the Google Fonts CDN — matches
`next/font` self-hosting, and (see below) `font-src` doesn't allow
`fonts.gstatic.com` anyway.

Verified in-browser: computed `body` → `Inter`, headings → `Manrope`,
all loading from ... (continued)

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