fix: repair cross-package bugs so all tests and tsc pass - #96

Summary

Fixes all failing tests and type errors in the monorepo. All bugs spanned multiple packages. No test files were modified and no dependencies were added.

Verification: bun test packages/utils/test packages/ui/test apps/web/test --preload ./packages/ui/test/setup.ts → 13 pass / 0 fail, and tsc --noEmit → 0 errors.

Fixes

1. Hook rename mismatch — useDebounce was renamed to useSearchDebounce in packages/utils (barrel export + git mv of the hook file), and the stale importer in apps/web/src/lib/api.ts was updated to match. The api.test.ts expectation of useSearchDebounce is the source of truth.
2. Button accessibility — icon-only Button now forwards aria-label (and other rest props) to the underlying <button>, satisfying WCAG 4.1.2 (Button.test.tsx).
3. Date formatting — formatDate now renders day-first with no leading zero on the day (e.g. 1/03/2024) while keeping month two-digit, satisfying all assertions in date.test.ts.
4. DataTable stale closure — fixed a stale-closure bug in the DataTable component caught by the controlled re-render test.
5. tsconfig — added bun type declarations so tsc --noEmit no longer errors on import ... from "bun:test" in the test files (required for a clean type check).

Assumptions

• The --preload ./packages/ui/test/setup.ts DOM setup (per the root test script) is the intended way to run the suite.
• The tsconfig type addition is the minimal change needed to make tsc --noEmit clean on the pre-existing bun:test import errors.