fix: add missing react-server-dom-webpack to App Router examples (#132)
App Router examples were missing react-server-dom-webpack as an explicit
dependency. With pnpm's strict module resolution, this caused the Vite
dev server to fail resolving react-server-dom-webpack/client.browser,
breaking client-side hydration — "use client" components rendered as
static HTML with no interactivity.
The @vitejs/plugin-rsc correctly adds react-server-dom-webpack to
optimizeDeps.include, but the package must be resolvable from the
project root. Without it in package.json, pnpm cannot link it.