chore: upgrade VitePress and pin patched transitive deps

[yanglbme]

Summary

• Upgrade VitePress 2.0.0-alpha.17 → 2.0.0-alpha.19 (Vite 8)
• Keep TypeScript ^6.0.3 because vue-tsc@3.3.11 cannot load TypeScript 7 (./lib/tsc export)
• Upgrade Vue ^3.5.41 and vue-tsc ^3.3.11
• Pin vite 8.2.2, esbuild 0.28.2, postcss 8.5.26, nanoid 3.3.18 in pnpm-workspace.yaml
• Declare engines.node as ^20.19.0 || >=22.12.0
• Raise Vite chunkSizeWarningLimit for the lazy-loaded local search index

Test plan

• pnpm docs:typecheck
• pnpm docs:build
• pnpm audit --registry https://registry.npmjs.org — 0 vulnerabilities

Made with Cursor

[Copilot]

Pull request overview

Updates the documentation toolchain dependencies to newer VitePress/Vite/Vue/TypeScript versions and pins several transitive dependencies to known patched releases, while adjusting Node engine requirements and Vite build warnings for the docs site.

Changes:

• Upgrade VitePress to 2.0.0-alpha.19 (Vite 8), plus related Vue and vue-tsc updates; keep TypeScript pinned at ^6.0.3.
• Pin patched transitive dependencies via pnpm overrides (vite, esbuild, postcss, nanoid) and update the lockfile accordingly.
• Declare supported Node versions and increase Vite chunkSizeWarningLimit for docs builds.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
pnpm-workspace.yaml	Pins transitive dependencies via overrides and updates the release-age exclusion to the new Vite version.
pnpm-lock.yaml	Regenerates lockfile to reflect the upgraded/pinned dependency graph.
package.json	Updates dev dependency versions and declares Node engine constraints.
docs/.vitepress/config.mts	Raises Vite build chunkSizeWarningLimit to reduce warnings for large lazy-loaded chunks (e.g., search index).

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

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