Improved json auto save & budget mobile UI

lib/domains/settings/settings_bloc.dart

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+import 'dart:async';
+
+import 'package:equatable/equatable.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:tunas/repositories/metadata/metadata_repository.dart';
+import 'package:tunas/repositories/metadata/models/settings.dart';
+
+part 'settings_event.dart';
+part 'settings_state.dart';
+
+class SettingsBloc extends Bloc<SettingsEvent, SettingsState> {
+  final MetadataRepository _metadataRepository;
+
+  SettingsBloc({required MetadataRepository metadataRepository}) : _metadataRepository = metadataRepository, super(const SettingsState()) {
+    on<SettingsLoad>(_onSettingsLoad);
+    on<SetThemeMode>(_onSetThemeMode);
+
+    _metadataRepository
+      .getSettingsStream()
+      .listen((settings) => add(SettingsLoad(settings)));
+  }
+
+  FutureOr<void> _onSettingsLoad(SettingsLoad event, Emitter<SettingsState> emit) {
+    emit(state.copyWith(
+      themeMode: event.settings.themeMode,
+    ));
+  }
+
+  FutureOr<void> _onSetThemeMode(SetThemeMode event, Emitter<SettingsState> emit) {
+    _metadataRepository.saveSettings(Settings(themeMode: event.themeMode));
+    emit(state.copyWith(
+      themeMode: event.themeMode,
+    ));
+  }
+}

lib/domains/settings/settings_event.dart

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+part of 'settings_bloc.dart';
+
+sealed class SettingsEvent extends Equatable {
+  const SettingsEvent();
+
+  @override
+  List<Object> get props => [];
+}
+
+final class SettingsLoad extends SettingsEvent {
+  final Settings settings;
+
+  const SettingsLoad(this.settings);
+}
+
+final class SetThemeMode extends SettingsEvent {
+  final ThemeMode themeMode;
+
+  const SetThemeMode(this.themeMode);
+}

lib/domains/settings/settings_state.dart

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+part of 'settings_bloc.dart';
+
+class SettingsState {
+  final ThemeMode themeMode;
+
+  const SettingsState({
+    this.themeMode = ThemeMode.system,
+  });
+
+  SettingsState copyWith({
+    ThemeMode? themeMode,
+  }) {
+    return SettingsState(
+      themeMode: themeMode ?? this.themeMode,
+    );
+  }
+}