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

lib/core/config/hive/custpm_adapters/theme_mode_adapter.dart

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+import 'package:flutter/material.dart';
+import 'package:hive_flutter/adapters.dart';
+import 'package:paperless_mobile/core/config/hive/hive_config.dart';
+
+class ThemeModeAdapter extends TypeAdapter<ThemeMode> {
+  @override
+  final int typeId = HiveTypeIds.themeMode;
+
+  @override
+  ThemeMode read(BinaryReader reader) {
+    switch (reader.readByte()) {
+      case 0:
+        return ThemeMode.system;
+      case 1:
+        return ThemeMode.dark;
+      case 2:
+        return ThemeMode.light;
+      default:
+        return ThemeMode.system;
+    }
+  }
+
+  @override
+  void write(BinaryWriter writer, ThemeMode obj) {
+    switch (obj) {
+      case ThemeMode.system:
+        writer.writeByte(0);
+        break;
+      case ThemeMode.light:
+        writer.writeByte(1);
+        break;
+      case ThemeMode.dark:
+        writer.writeByte(2);
+        break;
+    }
+  }
+
+  @override
+  int get hashCode => typeId.hashCode;
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is ThemeModeAdapter &&
+          runtimeType == other.runtimeType &&
+          typeId == other.typeId;
+}

lib/core/config/hive/hive_config.dart

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+import 'package:hive_flutter/adapters.dart';
+import 'package:paperless_mobile/core/config/hive/custpm_adapters/theme_mode_adapter.dart';
+import 'package:paperless_mobile/features/login/model/authentication_information.dart';
+import 'package:paperless_mobile/features/login/model/client_certificate.dart';
+import 'package:paperless_mobile/features/settings/global_app_settings.dart';
+import 'package:paperless_mobile/features/settings/model/color_scheme_option.dart';
+import 'package:paperless_mobile/features/settings/user_app_settings.dart';
+
+class HiveBoxes {
+  HiveBoxes._();
+  static const globalSettings = 'globalSettings';
+  static const userSettings = 'userSettings';
+  static const authentication = 'authentication';
+  static const vault = 'vault';
+}
+
+class HiveTypeIds {
+  HiveTypeIds._();
+  static const globalSettings = 0;
+  static const userSettings = 1;
+  static const themeMode = 2;
+  static const colorSchemeOption = 3;
+  static const authentication = 4;
+  static const clientCertificate = 5;
+}
+
+class HiveBoxSingleValueKey {
+  HiveBoxSingleValueKey._();
+  static const value = 'value';
+}
+
+void registerHiveAdapters() {
+  Hive.registerAdapter(ColorSchemeOptionAdapter());
+  Hive.registerAdapter(ThemeModeAdapter());
+  Hive.registerAdapter(GlobalAppSettingsAdapter());
+  Hive.registerAdapter(UserAppSettingsAdapter());
+  Hive.registerAdapter(AuthenticationInformationAdapter());
+  Hive.registerAdapter(ClientCertificateAdapter());
+}