chore(deps): migrate explorer and tutorial build stack to Vite 8

[alainncls]

Summary

Upgrade the frontend build stack to the latest eligible major versions older than 3 days as of 2026-04-23:

• explorer: vite 6.4.2 -> 8.0.8, @vitejs/plugin-react 4.7.0 -> 6.0.1, vite-plugin-svgr 4.5.0 -> 5.2.0, vite-tsconfig-paths 5.1.4 -> 6.1.1
• tutorial: vite 7.3.2 -> 8.0.8, @vitejs/plugin-react 5.2.0 -> 6.0.1

Why this is not in the current dependency bump PR

Vite 8 is a breaking build-tool migration. It changes bundler internals (Rolldown), can affect plugin behavior, and needs dedicated frontend build verification.

Documentation

• https://vite.dev/blog/announcing-vite8
• https://vite.dev/guide/migration.html
• https://vite.dev/plugins/

Expected codebase changes

• Review vite.config.* files in explorer and tutorial.
• Re-check SVG handling, tsconfig path resolution, React plugin behavior, and any custom plugin assumptions.
• Confirm the required Node.js version is satisfied in local and CI environments.

Migration plan

1. Upgrade Vite and the official/community plugins on a dedicated branch.
2. Update vite.config files for Vite 8 / Rolldown compatibility.
3. Re-test SVG import paths and tsconfig-path resolution.
4. Compare production build output, chunking, and warnings before/after.
5. Update CI/runtime documentation if the Node requirement changed.

Validation checklist

• Build explorer.
• Build tutorial.
• Smoke-test the built frontend bundles locally.
• Check for plugin regressions and new build-time warnings.

[alainncls]

Migration Vite 8 traitée dans la PR draft : #1065

Ce qui a été fait :

• explorer et tutorial passent sur vite@8.0.10.
• @vitejs/plugin-react passe sur v6 et vite-plugin-svgr sur v5 côté explorer.
• vite-tsconfig-paths est retiré côté explorer au profit du support natif Vite 8 resolve.tsconfigPaths.

Validation locale :

• pnpm --filter verax-explorer run build
• pnpm --filter @verax-attestation-registry/verax-tutorial run build
• pnpm --filter verax-explorer run lint
• pnpm --filter @verax-attestation-registry/verax-tutorial run lint
• hook pre-commit complet : prettier, lint global, forge test avec 199 tests passés

Point de vigilance : vite-plugin-radar@0.10.1 est la dernière version publiée et le build passe, mais son peer range annonce seulement Vite jusqu’à 7. J’ai donc gardé la PR en draft tant que cette compatibilité implicite n’est pas acceptée.