- Added tests to validate `ThemeProvider` updates resolved theme on system preference changes and ignores changes for non-system themes.
- Introduced tests to ensure `authStore` gracefully handles invalid tokens, storage errors, and logs errors appropriately during authentication state transitions.
- Improved test coverage by adding defensive error handling cases and refining token validation logic.
- **ThemeToggle:** Introduce comprehensive tests to validate button functionality, dropdown options, and active theme indicators.
- **ThemeProvider:** Add tests for theme management, localStorage persistence, system preferences, and DOM updates.
- **Header & Footer:** Verify header rendering, user menu functionality, and footer content consistency.
- **AuthInitializer:** Ensure authentication state is correctly loaded from storage on mount.
