fix: repair cross-package bugs, DOM test env, and tsc config

[stooit]

Summary

Fixes all failing tests and type errors in the monorepo. bun test now reports 13 pass / 0 fail and npx tsc --noEmit exits clean. No test files were modified and no dependencies were added.

Bugs fixed

Area	File	Fix
Renamed hook	apps/web/src/lib/api.ts	@e2e/utils no longer exports useThrottle; updated the import to the current hook name so tsc resolves the module.
Accessibility	packages/ui/src/components/Button/Button.tsx	Icon-only buttons now synthesise an aria-label so they have an accessible name (WCAG 4.1.2). Text buttons are left unchanged.
Stale closure	packages/ui/src/components/DataTable/DataTable.tsx	Sort handler captured stale state; switched to a functional state update so the "sorts descending on second click" re-render test passes.
Date locale/format	packages/utils/src/format/date.ts	Day was zero-padded (01/03/2024); now formats without a leading zero (1/03/2024) while keeping the en-AU locale.
Test DOM env	bunfig.toml	Restored the happy-dom DOM environment for packages/ui tests, which were throwing ReferenceError: document is not defined.
Type resolution	tsconfig.json	Added the already-installed bun-types so tsc recognises bun:test imports. Verified React/JSX/hook typechecking remains fully live.

Verification

• bun test -> 13 pass / 0 fail
• npx tsc --noEmit -> exit 0
• git diff --name-only confirms no test files changed and no dependency changes.

Assumptions / notes

• bunfig.toml and tsconfig.json are treated as configuration, not test files.
• The icon-only aria-label uses a "Button" fallback where no label is supplied; a stricter discriminated-union prop type would require editing a test file, so it was left out.
• Pre-existing accessibility debt noted but out of scope: the sortable <th> in DataTable is mouse-only (WCAG 2.1.1) and untouched here. Recommend a follow-up.

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