Keep crew roster in a consistent sidebar

frontend/src/assets/css/scene-setup.css

@@ -6,6 +6,11 @@
     margin: 2rem 0;
 }
 
+.setup-grid.single {
+    grid-template-columns: minmax(0, 700px);
+    justify-content: center;
+}
+
 @media (max-width: 800px) {
     .setup-grid {
         grid-template-columns: 1fr;
@@ -63,19 +68,3 @@
     border: 1px dashed var(--edge);
     color: var(--text-muted);
 }
-
-.roster-list {
-    display: flex;
-    flex-direction: column;
-    gap: 0.5rem;
-}
-
-.roster-item {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    gap: 0.75rem;
-    background: var(--well);
-    border-radius: var(--radius-sm);
-    padding: 0.6rem 0.9rem;
-}