[FerMPY]

Summary of Changes

• Playwright browser tests for both builds. e2e/serve.ts builds the SSR server and the SPA, then serves the SPA under /react-ts-template/ the way GitHub Pages does: files first, then directory index.html, then 404.html with a 404 status. Every test also fails on console errors, so hydration mismatches show up. They run in CI as a new "Browser tests (SSR and SPA)" job, which uploads traces on failure.
• Server function demo at /server: createServerFn (in src/server/) together with TanStack Query. In the SPA build it shows a notice instead of calling a server that doesn't exist. A small isSpa helper in #/lib/env replaces the scattered import.meta.env.MODE checks.
• Knip checks for unused files, exports and dependencies. It runs as pnpm lint:unused, as part of pnpm check, and in CI. It flagged two exports in src/queries/posts.ts, which are now private.
• Dependabot now skips minor bumps of oxc-transform-react, because @vitejs/plugin-react only accepts ^0.152.0. That replaces chore(deps-dev): bump oxc-transform-react from 0.152.0 to 0.153.0 in the vite-and-vitest group #11.
• README and AGENTS.md document all of the above.

Detailed Explanation

The browser tests cover the regressions found by hand while building the SPA/SSR setup:

• deep links served from 404.html
• the active nav link on a deep link
• not-found pages
• dark mode
• server function calls from the browser

To confirm they catch real bugs, I temporarily removed the ClientOnly workaround in __root.tsx. The SPA tests then failed on React error #418 and on the stale active link.

The server function's code stays on the server. The client assets contain neither SERVER_GREETING nor the default message, and the SSR page renders the env var.

Knip is pinned to ^6.40.0. 6.41.0 is less than a day old, so pnpm's minimum-release-age policy rejects it, and I didn't want to add an exception to the template.

Verification

From a clean pnpm install --frozen-lockfile:

Check	Result
pnpm check (format, lint, typecheck, Knip)	✅
pnpm test	✅ 6 tests
pnpm test:e2e	✅ 12 tests (6 per build)
Both builds	✅
pnpm lint:react	✅ 100/100

actionlint passes on the updated CI workflow.

Checklist

• I have tested these changes thoroughly
• pnpm check and pnpm test pass
• I have updated the documentation (if required)
• I have added/updated unit tests (if applicable)

🤖 Generated with Claude Code

[github-actions]

React Doctor found no new issues. 🎉

_{Reviewed by React Doctor for commit 49d001f.}