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 -->

package.json

@@ -64,9 +64,9 @@
     "@types/node": "^22.0.0",
     "@typescript-eslint/parser": "^8.55.0",
     "@vanilla-extract/vite-plugin": "^5.0.0",
-    "@vitest/browser": "^4.0.18",
-    "@vitest/coverage-istanbul": "^4.0.18",
-    "@vitest/ui": "^4.0.18",
+    "@vitest/browser": "^4.1.8",
+    "@vitest/coverage-istanbul": "^4.1.8",
+    "@vitest/ui": "^4.1.8",
     "cross-env": "^10.1.0",
     "electron": "^39.0.0",
     "eslint": "^9.39.2",
@@ -91,7 +91,7 @@
     "typescript-eslint": "^8.55.0",
     "unplugin-swc": "^1.5.9",
     "vite": "^7.2.7",
-    "vitest": "^4.0.18"
+    "vitest": "^4.1.8"
   },
   "packageManager": "yarn@4.13.0",
   "resolutions": {