Migrate to Vite 8 with Rolldown

You are performing a migration to Vite 8, which replaces esbuild and Rollup with Rolldown (Rust bundler) and Oxc (Rust compiler/minifier). The project may be on Vite 4, 5, 6, 7, or rolldown-vite. This skill covers the full upgrade path from any starting version.

Reference links (fetch these if you need additional detail beyond what is summarised below):

• Vite 8 announcement: https://vite.dev/blog/announcing-vite8
• v7 → v8 migration guide: https://vite.dev/guide/migration
• v6 → v7 migration guide: https://v7.vite.dev/guide/migration
• v5 → v6 migration guide: https://v6.vite.dev/guide/migration
• v4 → v5 migration guide: https://v5.vite.dev/guide/migration

Phase 0 — Discovery

Before making any changes, gather a complete picture of the workspace: