fix: resolve cross-package test failures and type errors

[stooit]

Summary

Fixes all failing tests and eliminates all type errors across the monorepo. After the fixes, bun run test reports 13 pass / 0 fail and tsc --noEmit exits 0.

Tests are run via the bun run test package script (which sets up the happy-dom preload); bare bun test skips that preload and produces spurious document is not defined errors.

Bugs fixed

File	Fix
apps/web/src/lib/api.ts	Hook was renamed in @e2e/utils; import/use useSearchDebounce instead of the removed useThrottle.
packages/ui/src/components/Button/Button.tsx	Forward aria-label so icon-only buttons expose an accessible name (a11y test).
packages/ui/src/components/DataTable/DataTable.tsx	Stale-closure sort bug — use the functional state updater so the sort direction toggles correctly on the controlled re-render test.
packages/utils/src/format/date.ts	Wrong locale/format string caused day/month confusion; corrected so "day 1 is not confused with month 1".
tsconfig.json	Added bun-types to compilerOptions.types so bun:test resolves in test files (config-only; bun-types already a devDependency).

Verification

• bun run test → 13 pass, 0 fail
• tsc --noEmit → exit 0, no errors

Constraints honoured

• No test files modified.
• No dependencies added (bun-types was already present).
• Only source + tsconfig changes required by the tests.