✨ Better theme & background image

lib/models/theme.dart

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+import 'dart:ui';
+
+import 'package:json_annotation/json_annotation.dart';
+
+part 'theme.g.dart';
+
+@JsonSerializable(converters: [ColorConverter()])
+class SolianThemeData {
+  String id;
+  Color seedColor;
+  String? fontFamily;
+  List<String>? fontFamilyFallback;
+
+  SolianThemeData({
+    required this.id,
+    required this.seedColor,
+    this.fontFamily,
+    this.fontFamilyFallback,
+  });
+
+  factory SolianThemeData.fromJson(Map<String, dynamic> json) =>
+      _$SolianThemeDataFromJson(json);
+
+  Map<String, dynamic> toJson() => _$SolianThemeDataToJson(this);
+
+  @override
+  int get hashCode => id.hashCode;
+
+  @override
+  bool operator ==(Object other) {
+    if (other is SolianThemeData) {
+      return id == other.id;
+    }
+    return false;
+  }
+}
+
+class ColorConverter extends JsonConverter<Color, int> {
+  const ColorConverter();
+
+  @override
+  Color fromJson(int json) {
+    return Color(json);
+  }
+
+  @override
+  int toJson(Color object) {
+    return object.value;
+  }
+}

lib/models/theme.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'theme.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+SolianThemeData _$SolianThemeDataFromJson(Map<String, dynamic> json) =>
+    SolianThemeData(
+      id: json['id'] as String,
+      seedColor:
+          const ColorConverter().fromJson((json['seed_color'] as num).toInt()),
+      fontFamily: json['font_family'] as String?,
+      fontFamilyFallback: (json['font_family_fallback'] as List<dynamic>?)
+          ?.map((e) => e as String)
+          .toList(),
+    );
+
+Map<String, dynamic> _$SolianThemeDataToJson(SolianThemeData instance) =>
+    <String, dynamic>{
+      'id': instance.id,
+      'seed_color': const ColorConverter().toJson(instance.seedColor),
+      'font_family': instance.fontFamily,
+      'font_family_fallback': instance.fontFamilyFallback,
+    };