fix: resolve failing tests across ui, utils, and web packages

[stooit]

Summary

Fixes all failing tests and type errors in the monorepo. bun run test now reports 13 pass / 0 fail and tsc --noEmit reports 0 errors. No test files were modified and no dependencies were added.

Changes

File	Fix
apps/web/src/lib/api.ts	The useThrottle hook was renamed to useDebounce in @e2e/utils, but api.ts still imported the old name. Updated the import and the useSearchDebounce re-export. Fixes both api.test.ts failures and the TS2305 error.
packages/ui/src/components/Button/Button.tsx	Icon-only buttons had no accessible name. The ariaLabel prop was destructured but never applied. Now applied via aria-label, with a fallback for icon-only buttons and a dev-only console.warn when a label is missing (WCAG 2.2 SC 4.1.2).
packages/utils/src/format/date.ts	formatDate zero-padded the day (01/03/2024); the test expects 1/03/2024. Switched from en-AU to en-GB with {day:"numeric", month:"2-digit", year:"numeric"} — same D/M/Y order, no day padding. formatDateTime left unchanged.
packages/ui/src/components/DataTable/DataTable.tsx	Stale-closure hardening in handleSort: replaced setSortDir(sortDir === ...) with the functional updater setSortDir(prev => ...).
tsconfig.json	Added "types": ["bun-types"] to resolve Cannot find module 'bun:test', and added apps/*/test/**/* to include (previously omitted, which is why the broken api.ts import wasn't caught by tsc).

Verification

• bun run test → 13 pass / 0 fail
• npx tsc --noEmit → 0 errors

Assumptions / notes

• Button aria-label fallback: the "Button" fallback for an icon-only button with no label satisfies the test's non-null assertion but is a non-descriptive accessible name. The console.warn is intended to push callers toward a meaningful label. Enforcing a required label at the type level would be a breaking API change and is out of scope.
• DataTable fix is latent-defect hardening — the stale closure was not reachable by the current tests, but the functional-updater form is correct and introduces no regression.
• The [Button] iconOnly requires an aria-label line in test output is the expected dev warning from the intentional no-label test path, not a failure.