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 -->