Refactor and optimize admin page components

- Remove unused imports and auto-refresh functionality
- Reduce padding and spacing for more compact admin layout
- Simplify stats generation and remove unused variables
- Adjust font sizes and icon sizes for better consistency
- Improve line-height on admin page title
- Minor performance optimizations

src/pages/AdminPage.vue

@@ -44,6 +44,7 @@
       font-size: 2rem;
       font-weight: 300;
       color: $text-color;
+      line-height: 1;
 
       @include mobile-only {
         font-size: 1.5rem;