Implemented inbox (still WIP)

lib/features/labels/model/label_state.dart

@@ -0,0 +1,19 @@
+import 'package:paperless_mobile/features/labels/model/label.model.dart';
+
+class LabelState<T extends Label> {
+  LabelState.initial() : this(isLoaded: false, labels: {});
+  final bool isLoaded;
+  final Map<int, T> labels;
+
+  LabelState({
+    required this.isLoaded,
+    required this.labels,
+  });
+
+  T? getLabel(int? key) {
+    if (isLoaded) {
+      return labels[key];
+    }
+    return null;
+  }
+}