fix: resolve all cross-package test failures and type errors

[stooit]

Summary

Fixes all failing tests and TypeScript errors in this multi-package monorepo. The bugs spanned multiple packages with cross-cutting dependencies.

Changes

• packages/utils/src/index.ts — Added useSearchDebounce and useThrottle as re-exports of useDebounce hook (the hook was renamed but consumers still referenced old names)
• packages/ui/src/components/Button/Button.tsx — Forward aria-label prop to the underlying <button> element for accessibility
• packages/ui/src/components/DataTable/DataTable.tsx — Fix stale closure bug by using functional state update (setSortDirection(prev => ...))
• packages/utils/src/format/date.ts — Fix date format to use day without leading zero (d/MM/yyyy → "1/03/2024")
• bunfig.toml — Add preload for UI test setup to enable happy-dom environment when running tests from root
• tsconfig.json — Add bun-types to compiler types for bun:test module resolution

Verification

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

Assumptions

• useSearchDebounce and useThrottle are aliases for the same underlying useDebounce hook
• The date format should be d/MM/yyyy (single-digit day, zero-padded month, 4-digit year)
• No test files were modified
• No new dependencies were added