Make Collections list more compact on mobile

Issue: Collections items too large, wasting vertical space
Fix: Reduce padding and font sizes for mobile

Changes:
- Collection items: 8px padding (was default larger)
- Font size: 14px (more compact)
- Heading: 18px (was larger)
- Search box: 8px padding
- Tighter line-height and margins

Result: More collections visible without scrolling

admin/index.html

@@ -32,7 +32,33 @@
         height: auto !important;
         border: none !important;
         margin: 0 !important;
-        padding: 12px !important;
+        padding: 8px !important;
+      }
+      
+      /* Collections list items - More compact */
+      aside li,
+      aside a,
+      [class*="Sidebar"] li,
+      [class*="Sidebar"] a {
+        padding: 8px 12px !important;
+        font-size: 14px !important;
+        line-height: 1.4 !important;
+        margin: 4px 0 !important;
+      }
+      
+      /* Collections heading - Smaller */
+      aside h2,
+      [class*="Sidebar"] h2 {
+        font-size: 18px !important;
+        margin: 8px 0 !important;
+        padding: 0 !important;
+      }
+      
+      /* Search box - More compact */
+      aside input,
+      [class*="Sidebar"] input {
+        padding: 8px !important;
+        font-size: 14px !important;
       }
       
       /* Main content takes full width */