ui: Make video frame full-width, move features beside track cards

frontend/style.css

@@ -707,12 +707,17 @@ input[type="number"]:focus {
 
 .frame-grid {
     display: grid;
-    grid-template-columns: 1.6fr .9fr;
-    grid-template-rows: auto auto 1fr;
+    grid-template-columns: 1fr 1fr;
+    grid-template-rows: auto auto auto;
     gap: 12px;
     min-height: 0;
 }
 
+/* Video panel spans full width */
+.frame-grid .panel-monitor {
+    grid-column: 1 / -1;
+}
+
 .intel {
     margin-top: 10px;
     display: flex;