feat(client): migration old package to rspack (#15068)

#### PR Dependency Tree


* **PR #15068** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Upgraded Vitest across packages to 4.1.8 and bumped Tailwind PostCSS
to 4.3.0
* CLI/tooling updated to support the media-capture-playground package
and adjust build/dev server behavior

* **Bug Fixes**
  * Improved workspace deletion reliability in the Electron app

* **Refactor**
* Simplified media capture playground build setup (build/config
adjustments)

* **Tests**
* Made tests more robust by preserving/restoring environment state
during runs
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

tools/cli/package.json

@@ -22,7 +22,7 @@
     "@rspack/dev-server": "^2.0.1",
     "@sentry/webpack-plugin": "^5.3.0",
     "@swc/core": "^1.10.1",
-    "@tailwindcss/postcss": "^4.0.0",
+    "@tailwindcss/postcss": "^4.3.0",
     "@vanilla-extract/webpack-plugin": "^2.3.15",
     "autoprefixer": "^10.4.20",
     "clipanion": "^3.2.1",