feat(KB-623): add mobile tab overflow scrolling for detail tabs

- Add horizontal overflow scrolling to .detail-tabs for mobile viewports
- Add -webkit-overflow-scrolling: touch for smooth momentum scrolling
- Hide scrollbars with scrollbar-width: none and ::-webkit-scrollbar
- Change .detail-tab from flex:1 to flex-shrink:0 to prevent tab compression

packages/dashboard/app/styles.css

@@ -2761,11 +2761,20 @@ body {
     padding: 12px 14px;
   }
 
+  .detail-tabs {
+    overflow-x: auto;
+    -webkit-overflow-scrolling: touch;
+    scrollbar-width: none;
+  }
+
+  .detail-tabs::-webkit-scrollbar {
+    display: none;
+  }
+
   .detail-tab {
     padding: 8px 12px;
     font-size: 13px;
-    flex: 1;
-    text-align: center;
+    flex-shrink: 0;
   }
 
   /* Settings modal: stack sidebar above content for mobile */