feat: upgrade to Vite 8, Rolldown RC5, and latest React experimental

[lazarv]

Upgrade to Vite 8, Rolldown RC5, and latest React experimental

This PR migrates the entire framework from rolldown-vite 7.3.0 to the official Vite 8.0.0-beta.15 (which integrates Rolldown natively) and updates all related dependencies.

Key changes

Dependency upgrades

• Vite: rolldown-vite@7.3.0 → vite@8.0.0-beta.15 — all imports changed from rolldown-vite to vite
• Rolldown: 1.0.0-beta.53 → 1.0.0-rc.5
• React: experimental 7dc903cd-20251203 → ab18f33d-20260220
• react-server-dom-webpack: updated to matching React experimental version
• All pnpm overrides updated accordingly (vite overrides, react overrides)

Vite 8 / Rolldown API migration

• advancedChunks → codeSplitting in all build configs (client, server, edge)
• inlineDynamicImports: true → codeSplitting: false (edge build)
• Added rolldownOptions.checks.pluginTimings support gated behind ROLLDOWN_PLUGIN_TIMINGS env var
• Output filter regex updated from rolldown-vite to vite version string matching
• Chunk size warning message updated to reference codeSplitting instead of advancedChunks
• Backward-compatible: configs still check both codeSplitting and advancedChunks groups

Manifest / build adjustments

• Client manifest entry filtering simplified: removed isDynamicEntry check (only isEntry needed)
• create-react-server scaffolding updated for new Vite version

Dev server and loaders

• createServer / createLogger imports migrated from rolldown-vite to vite
• Hybrid evaluator and render worker updated for Vite 8 APIs
• Deno loader module rewritten for compatibility
• Module alias loader adjusted
• Optimize-deps plugin updated

Test and docs

• Test setup (vitestSetup.mjs) and test dependencies updated
• tsconfig.json path alias cleanup
• Docs: micro-frontends page updated (en + ja) for Vite 8 import paths

27 files changed across the monorepo

[github-actions]

✅ Documentation preview deployed to: https://react-server-docs-iph8b3kfm-lazarv-team.vercel.app