fix: repair cross-package bugs and test environment

[stooit]

Summary

Fixes all failing tests and type errors across the monorepo (bun test && tsc --noEmit now fully green: 13 pass, 0 fail, 0 type errors). Bugs spanned all three packages plus shared config.

Changes

File	Fix
apps/web/src/lib/api.ts	Hook was renamed in @e2e/utils (useThrottle → useDebounce); updated the import and the useSearchDebounce re-export alias. Resolves the missing-export runtime + TS2305 errors.
packages/utils/src/format/date.ts	formatDate used explicit {month,day,year:"numeric"} which rendered month-first (01/03/2024). Switched to en-AU { dateStyle: "short" } for day-first, no-leading-zero output (1/03/2024).
bunfig.toml (root)	[test] declared environment = "happy-dom" but had no preload, so DOM globals weren't registered when running from the repo root (document is not defined). Added preload = ["./packages/ui/test/setup.ts"] (the existing happy-dom registrator).
packages/ui/src/components/Button/Button.tsx	aria-label prop was destructured but never forwarded; added aria-label={ariaLabel} to the element so the accessible name is set.
packages/ui/src/components/DataTable/DataTable.tsx	Stale-closure bug in sort toggle — replaced setSortDir(sortDir === ...) with the functional updater setSortDir(prev => ...).
tsconfig.json (root)	Added "types": ["bun-types"] so bun:test resolves under tsc --noEmit.

Assumptions

• The DOM-environment failure was a config gap (missing preload), not a test bug — fixed in bunfig.toml, no test files were touched.
• en-AU dateStyle: "short" is the intended locale/format per the date test's day-first, no-leading-zero expectation.
• Only existing, already-installed packages were wired up; no new dependencies added.

Verification

• bun test → 13 pass / 0 fail
• npx tsc --noEmit → exit 0
• No test files modified.