Update header title color to blue in both main and admin pages

- Changed header h1 color from #4a5568 (gray) to #667eea (blue)
- Applied same blue color to both main page and admin page
- Consistent branding across all pages

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

admin/styles.css

@@ -29,7 +29,7 @@ header {
 }
 
 header h1 {
-    color: #4a5568;
+    color: #667eea;
     font-size: 2.5rem;
     margin-bottom: 10px;
 }

styles.css

@@ -29,7 +29,7 @@ header {
 }
 
 header h1 {
-    color: #4a5568;
+    color: #667eea;
     font-size: 2.5rem;
     margin-bottom: 10px;
 }