Push sidebar if needed and scroll to notif when tapped

Fixes #116

lib/controllers/notification_request.dart

@@ -0,0 +1,14 @@
+import "package:flutter_riverpod/flutter_riverpod.dart";
+
+class NotificationRequestController extends Notifier<int?> {
+  @override
+  int? build() => null;
+
+  void request(int rowId) => state = rowId;
+
+  void consume() => state = null;
+
+  static final provider = NotifierProvider<NotificationRequestController, int?>(
+    NotificationRequestController.new,
+  );
+}