feat: Split settings, encrypted user credentials, preparations for multi user support

lib/features/settings/view/widgets/user_settings_builder.dart

@@ -0,0 +1,37 @@
+import 'package:flutter/material.dart';
+import 'package:hive_flutter/adapters.dart';
+import 'package:paperless_mobile/core/config/hive/hive_config.dart';
+import 'package:paperless_mobile/features/settings/global_app_settings.dart';
+import 'package:paperless_mobile/features/settings/user_app_settings.dart';
+
+class UserSettingsBuilder extends StatelessWidget {
+  final Widget Function(
+    BuildContext context,
+    UserAppSettings? settings,
+  ) builder;
+
+  const UserSettingsBuilder({
+    super.key,
+    required this.builder,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return ValueListenableBuilder<Box<UserAppSettings>>(
+      valueListenable:
+          Hive.box<UserAppSettings>(HiveBoxes.userSettings).listenable(),
+      builder: (context, value, _) {
+        final currentUser =
+            Hive.box<GlobalAppSettings>(HiveBoxes.globalSettings)
+                .get(HiveBoxSingleValueKey.value)
+                ?.currentLoggedInUser;
+        if (currentUser != null) {
+          final settings = value.get(currentUser);
+          return builder(context, settings);
+        } else {
+          return builder(context, null);
+        }
+      },
+    );
+  }
+}