split up search page

mobile/lib/providers/search/is_searching.provider.dart

@@ -0,0 +1,22 @@
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+/// Whether to display the video part of a motion photo
+final isSearchingProvider = StateNotifierProvider<IsSearching, bool>((ref) {
+  return IsSearching(ref);
+});
+
+class IsSearching extends StateNotifier<bool> {
+  IsSearching(this.ref) : super(false);
+
+  final Ref ref;
+
+  bool get value => state;
+
+  set value(bool value) {
+    state = value;
+  }
+
+  void toggle() {
+    state = !state;
+  }
+}