fix: resolve cross-package bugs causing test failures

[stooit]

Summary

Fixes 4 cross-package bugs that caused 9 test failures across the monorepo:

• Renamed hook import — apps/web/src/lib/api.ts imported useThrottle which was renamed to useDebounce in @e2e/utils; also added useSearchDebounce re-export that tests expect
• DOM environment for UI tests — Added jsdom test environment in bunfig.toml so @testing-library/react tests have a DOM
• Accessibility attribute — Forwarded aria-label prop in Button component for icon-only button accessibility
• Stale closure in DataTable — Used functional state update in sort handler to avoid stale closure on re-renders
• Date format string — Changed format from dd/MM/yyyy to d/MM/yyyy (day without leading zero)

Verification

All 13 tests pass, 0 failures. TypeScript source files compile cleanly (npx tsc --noEmit only reports missing bun:test type declarations in test files, which is expected).

Assumptions

• The bun:test module type declaration errors in test files are pre-existing and not in scope (we cannot modify test files or add dependencies)
• The useSearchDebounce export is a thin wrapper re-exporting useDebounce under the name the consuming app expects