style: apply littwin-blue color to NTP settings checkbox

- Add accent-littwin-blue class to NTP active checkbox
- Increase checkbox size to w-4 h-4 for better visibility
- Maintain consistent brand coloring across UI components

CHANGELOG.md

@@ -1,3 +1,13 @@
+## [1.6.671] – 2025-07-31
+
+- feat: hide logout button when admin is not logged in
+
+- Add conditional rendering for "Abmelden" button based on isAdminLoggedIn state
+- Button only appears when localStorage contains "isAdminLoggedIn": "true"
+- Improves UI cleanliness by hiding unnecessary logout option for regular users
+- Maintains existing admin warning banner and logout functionality when needed
+
+---
 ## [1.6.670] – 2025-07-31
 
 - feat: implement modal chart system with conditional UI and message filtering