mobile: consistent dark theme as desktop

js/mobile/src/components/ListSeparator.tsx

@@ -0,0 +1,10 @@
+import { View } from "react-native";
+
+/**
+ * Inset hairline separator for edge-to-edge list rows. Pass to a FlatList
+ * via `ItemSeparatorComponent` so it renders only between rows, not after
+ * the last one. Mirrors desktop's <Separator className="mx-4" /> pattern.
+ */
+export function ListSeparator() {
+  return <View className="bg-border mx-4 h-px" />;
+}