fix: repair cross-package test and type failures

[stooit]

Summary

Fixes all failing tests and type errors across the monorepo (packages/ui, packages/utils, apps/web). After changes: 13/13 tests pass, tsc --noEmit clean. No test files or dependencies were modified.

Changes

Area	Fix
Test DOM env — bunfig.toml	React tests threw document is not defined. Added preload = ["./packages/ui/test/setup.ts"] so happy-dom's GlobalRegistrator.register() runs before @testing-library/react's render().
Type resolution — tsconfig.json	Cannot find module 'bun:test'. Added "types": ["bun-types"] to compilerOptions.
Stale import — apps/web/src/lib/api.ts	useThrottle was renamed to useDebounce in @e2e/utils; updated the import and the as useSearchDebounce re-export.
Accessibility — Button.tsx	The aria-label prop was destructured but never applied. Now forwarded to the <button> (omitted by React when undefined, so other buttons are unaffected).
Stale closure — DataTable.tsx	Sort direction toggle read stale sortDir from the closure. Switched to the functional updater form setSortDir(prev => ...).
Date locale — packages/utils/src/format/date.ts	Explicit numeric options produced month-first, zero-padded output. Switched to en-AU with { dateStyle: "short" } for day-first, non-zero-padded days.

Assumptions

• Config files (bunfig.toml, tsconfig.json) are in scope; only test files were treated as off-limits.
• The existing packages/ui/test/setup.ts already registers happy-dom, so only the preload wiring was needed.
• en-AU is the intended locale (matches the pre-existing locale string; only the format options were wrong).

Verification

$ bun test
 13 pass / 0 fail  (5 files)
$ npx tsc --noEmit
(exit 0)