chore: upgrade Rolldown 1.0.0-rc.16 (#394)

Automated daily upgrade of Vite, Rolldown, and/or Vitest to the latest
available versions.

**Rolldown:** `1.0.0-rc.15` → `1.0.0-rc.16`

### Updated locations
- `packages/react-server/package.json` — `vite`, `rolldown`
- `test/package.json` — `vite`, `rolldown`, `vitest`, `@vitest/ui`
- `packages/rsc/package.json` — `vitest`, `@vitest/*`
- `packages/create-react-server/test/package.json` — `vitest`
- `package.json` — all `pnpm.overrides` for Vite
- `pnpm-lock.yaml`

### Smoke test
- Dev mode — `hello world` test passed ✅
- Build+start mode — `hello world` test passed ✅

Co-authored-by: lazarv <1749493+lazarv@users.noreply.github.com>

Author: react-server-bot[bot]

packages/react-server/package.json

@@ -238,7 +238,7 @@
     "react-refresh": "^0.14.2",
     "remark-frontmatter": "^5.0.0",
     "remark-mdx-frontmatter": "^4.0.0",
-    "rolldown": "1.0.0-rc.15",
+    "rolldown": "1.0.0-rc.16",
     "sass": "^1.86.0",
     "semver": "^7.6.3",
     "smol-toml": "^1.6.0",