Generic Frontend UI Rules for Codeium

# Generic Frontend UI Rules for Codeium

## UX fundamentals
- Prioritize clarity over visual novelty.
- Every state has explicit UI: loading, empty, error, success.
- Accessibility is default: keyboard support, contrast, ARIA labels where needed.

## Components
- Reusable primitives first, page composition second.
- Keep presentation and data-fetching concerns separated.
- Avoid prop drilling beyond 2 levels—use context/store intentionally.

## Reliability
- Defensive rendering for null/undefined API data.
- Optimistic UI only where rollback is clearly handled.