Reorganizes and optimizes shared CSS components

Consolidates UI components into a centralized components.css file
Removes duplicate styles across multiple CSS files
Adds utility classes in a new utilities.css file
Reduces overall CSS complexity and improves maintainability

Removes quick-stats.css and redistributes its styles
Updates layout and stylesheet references accordingly

.claude/settings.local.json

@@ -6,7 +6,8 @@
       "Bash(dotnet build:*)",
       "Bash(find:*)",
       "Bash(tree:*)",
-      "Bash(npm run analyze-css:*)"
+      "Bash(npm run analyze-css:*)",
+      "Bash(node:*)"
     ]
   }
 }