fix: resolve all failing tests across monorepo packages

[stooit]

Summary

• Renamed hook export: Added useSearchDebounce export alias in packages/utils (the hook was renamed to useDebounce but consumers still referenced the old name)
• Fixed stale import: Updated apps/web/src/lib/api.ts to import useSearchDebounce instead of the non-existent useThrottle
• Button accessibility: Fixed the Button component to pass through aria-label prop for icon-only buttons
• DataTable stale closure: Fixed sort handler to use functional state update (prev => ...) instead of capturing stale closure value
• Date formatting: Changed date format from dd/MM/yyyy to d/MM/yyyy to avoid zero-padding the day
• Test environment: Configured happy-dom preload in root bunfig.toml so DOM-dependent UI tests run correctly from workspace root

Verification

All 13 tests pass across 5 test files. TypeScript compilation is clean (only bun:test module declaration warnings in test files, which are expected).

Assumptions

• The bun:test TypeScript errors are expected and do not affect runtime — bun resolves these internally
• The date format change to non-padded day (d/MM/yyyy) matches the test expectation of output starting with "1" for March 1st
• The happy-dom preload at root level is the correct approach for bun workspace test runs