Migrate UI tooling to Vite and Vitest

[ruibaby]

What does this PR do?

• Migrates the plugin UI build from Rsbuild to Vite and emits an ESM UI plugin manifest for Halo 2.26.
• Migrates the UI and SDK unit tests from Rstest to Vitest while retaining the existing happy-dom environment.
• Updates dynamic imports, UnoCSS integration, icon generation, and the VueUse integration import for Vite compatibility.
• Removes the direct Rsbuild and Rstest dependencies and regenerates the pnpm lockfile.
• Raises the minimum supported Halo version to 2.26.

Testing

• cd ui && pnpm test:unit — 29 test files, 185 tests
• cd ui && pnpm -C packages/sdk test — 5 test files, 84 tests
• cd ui && pnpm type-check
• cd ui && pnpm -C packages/sdk typecheck
• cd ui && pnpm build-only
• git diff --check
• ./gradlew clean build

Notes

• The UI bundler kit currently uses the temporary pkg.pr.new build for @halo-dev/ui-plugin-bundler-kit@815292f.
• This PR should remain in draft until the corresponding bundler-kit changes are available from a stable dependency source.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@halo-dev/ai-foundation-sdk@95

commit: 8ca2152