fix: repair cross-package bugs so all tests and type checks pass

[stooit]

Summary

Fixes all 5 failing tests and all tsc --noEmit errors across the monorepo. Bugs spanned three packages plus the root TS config.

Verified green:

• bun test … --preload ./packages/ui/test/setup.ts → 13 pass / 0 fail
• npx tsc --noEmit → 0 errors

Root causes & fixes

1. Renamed hook still imported by old name — apps/web/src/lib/api.ts imported useThrottle from @e2e/utils, but the package exports useDebounce. Switched the import and the useSearchDebounce re-export to the real name.

2. Missing accessibility attribute — packages/ui/src/components/Button dropped aria-label. Props now extends React.ButtonHTMLAttributes<HTMLButtonElement> and the component spreads passthrough props onto the <button>, so aria-label, disabled, onClick, etc. all forward. Added a console.warn for icon-only buttons rendered without an aria-label (WCAG 4.1.2).

3. Wrong date format — formatDate in packages/utils/src/format/date.ts zero-padded the day (01/03/2024). Reimplemented with UTC getters and an unpadded day so 1 March 2024 → 1/03/2024, and the result is timezone-deterministic (avoids host-TZ flakiness on the Z-timestamped fixtures).

4. bun:test unresolved by tsc — root tsconfig.json did not register the already-installed bun-types. Added "types": ["bun-types"] and included apps/*/test/**/* so app tests are in scope.

Constraints honoured

• No test files modified.
• No dependencies added (bun-types was already a devDependency).
• Only the four source/config files above were changed.

Assumptions

• The Button "no aria-label" test asserts the attribute is present (non-null), so the attribute is kept and paired with a runtime console.warn rather than omitted — this satisfies the test contract while surfacing the accessibility issue.
• Date fixtures use UTC (Z) timestamps, so getUTC* getters were chosen for deterministic output regardless of the CI host timezone.

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