Replace npm with pnpm

[Copilot]

After switching to pnpm, the playground build started failing in Vite/Rolldown on unresolved imports (e.g. @fluentui/react-component-ref) that were previously masked by hoisting. This PR aligns package boundaries with pnpm’s stricter resolution and updates playground module resolution behavior accordingly.

• Root cause surfaced by pnpm strictness

  • Workspace packages and playground code were relying on transitive/hoisted dependencies not declared where imported.
  • preserveSymlinks in playground Vite config amplified unresolved imports across linked workspace packages.

• Dependency declaration fixes (make imports explicit)

  • packages/semantic-ui/package.json: add @fluentui/react-component-ref
  • packages/chakra-ui/package.json: add @ark-ui/react, @zag-js/react
  • packages/fluentui-rc/package.json: add @griffel/react
  • packages/playground/package.json: add @ant-design/cssinjs, primereact

• Playground resolver adjustment

  • packages/playground/vite.config.ts: switch resolve.preserveSymlinks from true to false so Vite resolves dependencies via real pnpm install topology instead of preserving symlink boundaries.

• Lockfile update

  • Regenerated pnpm-lock.yaml to reflect explicit dependency ownership and version graph.

// packages/playground/vite.config.ts
resolve: {
  preserveSymlinks: false,
  alias: {
    '@rjsf/semantic-ui': path.resolve(__dirname, '../semantic-ui/src'),
    '@rjsf/chakra-ui': path.resolve(__dirname, '../chakra-ui/src'),
    // ...
  },
}