fix: repair cross-package bugs so tests and typecheck pass

[stooit]

Summary

Fixes all failing tests and type errors across the monorepo (bun test → 13/13 pass, tsc --noEmit → 0 errors). Source/config only — no test files modified, no dependencies added.

Fixes

• ui/Button (packages/ui/src/components/Button/Button.tsx): Props now extends React.ButtonHTMLAttributes; passthrough props (incl. aria-label) are spread onto the <button>, giving icon-only buttons an accessible name.
• ui/DataTable (packages/ui/src/components/DataTable/DataTable.tsx): sort direction now uses a functional state updater (prev => ...), fixing the stale-closure bug on the second click; rows render from the full data set when no sort is active.
• web/api (apps/web/src/lib/api.ts): the hook was renamed in packages/utils from useThrottle to useDebounce; import/usage updated and re-exported as useSearchDebounce (as the test expects).
• utils/date (packages/utils/src/format/date.ts): en-AU formatting now renders day-first without a leading zero, so 1 March is 1/03/2024 (not 01/03/2024).
• tsconfig (tsconfig.json): added "types": ["bun-types"] so bun:test resolves under tsc --noEmit (bun-types was already an installed devDependency; no new deps).

Verification

• bun test packages/utils/test packages/ui/test apps/web/test --preload ./packages/ui/test/setup.ts → 13 pass, 0 fail
• bun run typecheck (tsc --noEmit) → 0 errors

Assumptions

• Bugs were fixed in source only, matching existing test expectations; no test behaviour was changed.
• The bun:test type errors were resolved via tsconfig types rather than editing test files, per the "do not modify test files / no new dependencies" constraints.