chore(deps): upgrade vite to v8 with Rolldown migration

[dtoxvanilla1991]

Summary

Upgrades vite from ^7.0.0 to ^8.0.0 (resolves to 8.0.10) and applies the required migration for this codebase.

Supersedes / replaces #221 (the Renovate bot PR had merge conflicts with main due to the TS 6 bump and other changes that landed since the branch was cut).

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What changed

package.json

• vite: ^7.0.0 → ^8.0.0

vite.config.ts

• build.rollupOptions → build.rolldownOptions

  Vite 8 ships Rolldown as its bundler. The rollupOptions key is now deprecated (auto-converted via a compatibility layer but will be removed in a future major). Renaming to rolldownOptions eliminates the deprecation warning and future-proofs the config. The external array maps 1:1 to rolldownOptions.external - no other changes required.

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Why migration was needed (Vite 8 → Rolldown/Oxc)

Area	Vite 7	Vite 8	Impact on this repo
Bundler	Rollup	Rolldown	rollupOptions → rolldownOptions ✅ migrated
JS transformer	esbuild	Oxc	Not configured explicitly → no change needed
JS minifier	esbuild	Oxc minifier	Not configured explicitly → no change needed
CSS minifier	esbuild	Lightning CSS	Already used via vitest peer → no change needed
optimizeDeps	esbuild	Rolldown	Not configured explicitly → no change needed

All other Vite 8 breaking changes (CJS interop, UMD import.meta.url, format sniffing removal, build() throws BundleError, etc.) do not apply to this library build setup.

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Verification

All 616 tests pass on vite@8.0.10:

Test Files  54 passed (2 skipped)
Tests       616 passed (20 skipped)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8547c9eb-48fc-42e8-b9c4-c23561724bea

📥 Commits

Reviewing files that changed from the base of the PR and between 87458ce and 089a9d8.

⛔ Files ignored due to path filters (2)

• package.json is excluded by !**/*.json
• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml, !**/*.yaml

📒 Files selected for processing (1)

• vite.config.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/upgrade-vite-8

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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