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

[stooit]

Summary

Fixes 4 cross-package bugs plus a type-resolution issue so bun test (13 tests) and tsc --noEmit both pass cleanly. No test files were modified and no dependencies were added.

Changes

• apps/web/src/lib/api.ts — The hook useThrottle was renamed to useDebounce in @e2e/utils. Updated the import and the useSearchDebounce re-export to the new name.
• packages/ui/src/components/Button/Button.tsx — Button now extends React.ButtonHTMLAttributes and spreads passthrough props onto the <button>, so aria-label reaches the DOM. Icon-only buttons with no explicit label now receive a sensible default aria-label (WCAG 4.1.2 accessible name); an explicit aria-label still wins.
• packages/ui/src/components/DataTable/DataTable.tsx — Fixed a stale-closure sort toggle by using the functional state updater (setSortDir(prev => ...)), so the direction flips correctly across controlled re-renders.
• packages/utils/src/format/date.ts — Replaced the fragile locale-dependent format with explicit day/month/year fields for a stable en-AU D/MM/YYYY output (day not zero-padded, matching the corpus intent).
• tsconfig.json — Added "types": ["bun-types"] so bun:test resolves in test files (uses the already-installed bun-types; no new dependency).

Verification

• bun test ... --preload ./packages/ui/test/setup.ts → 13 pass, 0 fail
• tsc --noEmit → clean (exit 0)

Assumptions

• For icon-only buttons the accessible name is auto-derived when none is supplied, since a Button test asserts the aria-label must not be null in that case.
• Date output keeps the day un-padded (e.g. 1/03/2024) per the test's assertions, while month stays zero-padded and year 4-digit.

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