Adopting TypeScript incrementally (the move off plain JS). Upgraded jsconfig ->
tsconfig with strict + noUncheckedIndexedAccess, but allowJs + checkJs:false so
every existing .js/.jsx keeps resolving and running untouched — only .ts/.tsx
get type-checked. Added 'npm run typecheck' (tsc --noEmit) and wired it into
'npm run ci'. Installed typescript 6 + @types/react/react-dom 19. Client-scoped
(Vite resolves the '@/' paths); the CommonJS server is a separate TS story.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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