🔧 Fix white page-stats-section in admin-dashboard

- Updated .page-stats-section background to dark theme
- Changed text colors to white for better contrast
- Updated border colors to match dark theme
- Changed page-count badges to cyan accent color
- Fixed 'Hauptseiten besucher' section to match overall dark design

public/css/adminlogin.css

@@ -23,7 +23,7 @@ body {
     align-items: center;
     justify-content: center;
     padding: 20px;
-    background-image: 
+    background-image:
         radial-gradient(circle at 20% 80%, #1a1a2e 0%, transparent 50%),
         radial-gradient(circle at 80% 20%, #16213e 0%, transparent 50%),
         radial-gradient(circle at 40% 40%, #0f3460 0%, transparent 50%);