chore(deps): bump vite-plus to 0.1.21-alpha.6

[fengmk2]

Summary

Bump vite-plus and related packages to alpha 0.1.21-alpha.6.

Updated where applicable:

• vite-plus
• vitest (alias to @voidzero-dev/vite-plus-test)
• vite (alias to @voidzero-dev/vite-plus-core)
• overrides / resolutions / pnpm.overrides / pnpm-workspace.yaml catalogs

Test plan

• CI passes

[gemini-code-assist]

Code Review

This pull request updates the vite-plus dependency to version 0.1.21-alpha.6 in both the root and playground package.json files. The reviewer noted that the changes appear incomplete, as the PR description mentions bumping other related packages and updating configuration fields like overrides or resolutions that are currently missing from the diff.

[gemini-code-assist]

The PR description mentions bumping related packages and updating configuration fields like overrides or resolutions to version 0.1.21-alpha.6, but these changes are missing from the diff. Please verify if these should be included to ensure the entire ecosystem is correctly aligned with the new alpha version.

[gemini-code-assist]

The expected updates for related packages mentioned in the PR description are missing from this file. Please ensure all intended dependencies are bumped to the alpha version to maintain consistency across the workspace.