fix: remove duplicate eyebrow headers from settings cards and fix grid width

- Drop the redundant 'Settings' eyebrow from both Overlay and
  Integrations cards; the h3 heading is sufficient
- Change dashboard-grid from auto-fit/minmax to repeat(2, 1fr) so the
  two settings cards always split the full width evenly

src/main/resources/static/css/styles.css

@@ -1041,7 +1041,7 @@ button:disabled:hover {
 
 .dashboard-grid {
     display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
+    grid-template-columns: repeat(2, 1fr);
     gap: 20px;
     align-items: start;
 }
@@ -3146,8 +3146,6 @@ button:disabled:hover {
     .dashboard-grid {
         grid-template-columns: 1fr;
     }
-
-    .danger-zone-item {
         flex-direction: column;
     }