fix: resolve all failing tests across monorepo packages

[stooit]

Summary

• Renamed hook: Export useDebounce as useSearchDebounce from @e2e/utils and fix the import in apps/web/src/lib/api.ts (was importing removed useThrottle)
• Button accessibility: Pass aria-label prop through to the rendered button element
• DataTable stale closure: Use functional state updater in sort handler to avoid capturing stale state
• Date formatting: Switch to non-zero-padded day format (d/MM/yyyy style via en-AU locale options)
• DOM test environment: Configure happy-dom preload in root bunfig.toml so UI tests have access to document/window

Verification

All 13 tests pass (bun test). TypeScript compiles cleanly (npx tsc --noEmit — only expected bun:test module resolution warnings remain since it's a runtime-only module).

Assumptions

• The bun:test TS2307 errors are expected/acceptable since bun:test is not a real npm package
• The date format expectation of "1/03/2024" (non-zero-padded day) is the intended behavior
• No test files were modified
• No new dependencies were added