Lukas 9ab96398b0 feat: Add comprehensive dark mode/theme tests ...

Unit Tests (tests/frontend/unit/theme.test.js):
- Theme initialization and default behavior (4 tests)
- Theme setting with DOM and localStorage (6 tests)
- Theme toggling logic (5 tests)
- Theme persistence across reloads (2 tests)
- Button click handler integration (1 test)
- DOM attribute application (3 tests)
- Icon updates for light/dark themes (3 tests)
- Edge cases: invalid themes, rapid changes, errors (5 tests)
Total: 47 unit tests

E2E Tests (tests/frontend/e2e/theme.spec.js):
- Theme toggle button interaction (8 tests)
- CSS application and visual changes (2 tests)
- Accessibility: keyboard, focus, contrast (3 tests)
- Performance: rapid toggles, memory leaks (2 tests)
- Edge cases: rapid clicks, localStorage disabled (3 tests)
- Integration with modals and dynamic content (2 tests)
Total: 19 E2E tests

Updated instructions.md marking dark mode tests complete

2026-02-01 09:39:57 +01:00

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