fix: repair cross-package bugs causing test and type failures

[stooit]

Summary

Fixes all 4 cross-package bugs in the monorepo. bun run test now reports 13 pass / 0 fail, and there are no TypeScript errors in source code.

Changes

File	Bug	Fix
apps/web/src/lib/api.ts	Hook renamed useThrottle → useDebounce in @e2e/utils, old name still imported, breaking the useSearchDebounce re-export	Import/re-export useDebounce
packages/utils/src/format/date.ts	Explicit numeric options overrode locale ordering, producing 01/03/2024 instead of day-first 1/03/2024	Use { dateStyle: "short" } so en-AU controls ordering
packages/ui/src/components/Button/Button.tsx	aria-label destructured but never applied to <button>	Forward aria-label to the DOM, with fallback for icon-only buttons
packages/ui/src/components/DataTable/DataTable.tsx	Stale-closure: handleSort read render-time sortDir, caught by controlled re-render test	Use functional updater setSortDir(prev => ...)

Verification

• bun run test → 13 pass, 0 fail
• tsc --noEmit → no source errors (remaining bun:test module-resolution errors are confined to test files, pre-existing; test files were not modified per task constraints)

Assumptions

• Did not modify test files or add dependencies (per constraints).
• dateStyle: "short" matches the existing formatDateTime convention in the same file and satisfies day-first test assertions.
• Icon-only aria-label fallback is a minimal safety net; descriptive labels remain the caller's responsibility.

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