Add Edge browser compatibility for dashboard backgrounds

- Added background-color fallback for browsers without gradient support
- Split background property for better cross-browser compatibility
- Ensures Edge and other browsers display light background correctly

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

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

assets/scss/components/_dashboards.scss

@@ -9,6 +9,8 @@
 .member-dashboard {
   padding: 2rem;
   min-height: 100vh;
+  background-color: #fafafa; // Fallback for browsers that don't support gradients
+  background-image: linear-gradient(135deg, #fafafa 0%, #f4f4f5 100%);
   background: linear-gradient(135deg, #fafafa 0%, #f4f4f5 100%);
   
   @media (max-width: 768px) {