Scaffold pnpm monorepo + web app (Vite 8, React 19, TanStack Router, TS7, Tailwind v4)

[ankitsejwal]

What

Scaffolds the project as a pnpm + Turborepo monorepo with the web app in apps/web, per #1. Everything builds, typechecks, and lints clean locally.

Stack

• Vite 8.1 (Rolldown) · React 19.2 SPA · TanStack Router 1.170 (file-based, type-safe) · TypeScript 7.0-rc · Tailwind v4.3 + shadcn/ui
• Lint: oxlint (see notes) · CI: GitHub Actions — install → lint → typecheck → build

Layout

apps/web/     React SPA (the app)
packages/     reserved for shared code

Room for apps/mobile later (the reason for going monorepo now).

Notes / decisions

• oxlint instead of ESLint. typescript-eslint can't load TypeScript 7 yet — TS7 restructured its package exports and the parser fails to resolve it. Rather than pin TS back, switched the linter to oxlint (Oxc's Rust linter): it parses TS/TSX natively, needs no typescript package, and is consistent with the Oxc-based stack (Vite 8/Rolldown already use Oxc). Result: 0 warnings / 0 errors across 7 files, 90 rules.
• TanStack Router, not Start. This is a client-only tool (image + PDF in the browser); Start's SSR/server runtime is unnecessary.
• routeTree.gen.ts is committed so fresh clones typecheck without a pre-generate step; the Vite router plugin keeps it updated on dev/build.
• No backend, no auth — fully client-side by design (the privacy differentiator).

Verification

Check	Result
pnpm lint	✅ oxlint 0/0
pnpm typecheck	✅ tsc 7.0.1-rc
pnpm build	✅ Vite 8, ~90ms

Closes #1