- split tsconfig.json into project references (client + server) so bun-types and DOM types don't leak into the other side; server now resolves Bun.* without diagnostics
- client tsconfig adds vite/client types so import.meta.env typechecks
- index.tsx spa fallback: use async/await + c.html(await …) instead of returning a Promise of a Response, which Hono's Handler type rejects
- subtitles normalize-titles: narrow canonical to string|null (Map.get widened to include undefined)
