[stooit]

Makes bun test && tsc --noEmit pass (13/13 tests, 0 type errors). No test files modified, no dependencies added.

• bunfig.toml: replaced invalid environment = "happy-dom" with preload of existing packages/ui/test/setup.ts (fixes document is not defined).
• tsconfig.json: added types: ["bun-types"] (already installed) for bun:test types.
• apps/web/src/lib/api.ts: import renamed useDebounce instead of removed useThrottle; useSearchDebounce export unchanged.
• Button.tsx: always forwards aria-label; icon-only without label warns and falls back to "Button".
• DataTable.tsx: functional setSortDir(prev => ...) fixes stale state.
• date.ts: formatDate builds D/MM/YYYY via formatToParts.

Assumptions / follow-ups

• The Button test requires a non-null aria-label even when none is passed; the "Button" fallback is a stopgap. Follow-up: require aria-label at type level for iconOnly and gate the warning to dev.
• Review agent found no critical/high issues.