refactor: reduce model and focus boilerplate

lib/models/livetv_hub_result.dart

@@ -7,7 +7,7 @@ class LiveTvHubResult {
   final String hubKey;
   final List<LiveTvHubEntry> entries;
 
-  LiveTvHubResult({required this.title, required this.hubKey, required this.entries});
+  const LiveTvHubResult({required this.title, required this.hubKey, required this.entries});
 }
 
 /// A single item in a live TV hub, holding both display metadata and EPG timing.
@@ -15,5 +15,5 @@ class LiveTvHubEntry {
   final MediaItem metadata;
   final LiveTvProgram program;
 
-  LiveTvHubEntry({required this.metadata, required this.program});
+  const LiveTvHubEntry({required this.metadata, required this.program});
 }

lib/models/mpv_config_models.dart

@@ -1,3 +1,8 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'mpv_config_models.g.dart';
+
+@JsonSerializable()
 class MpvPreset {
   final String name;
   final String text;
@@ -5,13 +10,7 @@ class MpvPreset {
 
   const MpvPreset({required this.name, required this.text, required this.createdAt});
 
-  factory MpvPreset.fromJson(Map<String, dynamic> json) {
-    return MpvPreset(
-      name: json['name'] as String,
-      text: json['text'] as String,
-      createdAt: DateTime.parse(json['createdAt'] as String),
-    );
-  }
+  factory MpvPreset.fromJson(Map<String, dynamic> json) => _$MpvPresetFromJson(json);
 
-  Map<String, dynamic> toJson() => {'name': name, 'text': text, 'createdAt': createdAt.toIso8601String()};
+  Map<String, dynamic> toJson() => _$MpvPresetToJson(this);
 }

lib/models/mpv_config_models.g.dart

@@ -0,0 +1,19 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'mpv_config_models.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+MpvPreset _$MpvPresetFromJson(Map<String, dynamic> json) => MpvPreset(
+  name: json['name'] as String,
+  text: json['text'] as String,
+  createdAt: DateTime.parse(json['createdAt'] as String),
+);
+
+Map<String, dynamic> _$MpvPresetToJson(MpvPreset instance) => <String, dynamic>{
+  'name': instance.name,
+  'text': instance.text,
+  'createdAt': instance.createdAt.toIso8601String(),
+};

lib/models/trakt/trakt_ids.dart

@@ -1,9 +1,14 @@
+import 'package:json_annotation/json_annotation.dart';
+
 import '../../utils/external_ids.dart';
 
+part 'trakt_ids.g.dart';
+
 /// External IDs for matching Plex items against Trakt's catalog.
 ///
 /// Trakt prefers (in order): trakt > slug > imdb > tmdb > tvdb. Movies use
 /// imdb/tmdb; episodes use the show's tvdb/tmdb/imdb plus season/episode index.
+@JsonSerializable(includeIfNull: false)
 class TraktIds {
   final int? trakt;
   final String? slug;
@@ -16,21 +21,9 @@ class TraktIds {
   /// True when at least one external ID is set (i.e. usable for Trakt matching).
   bool get hasAny => imdb != null || tmdb != null || tvdb != null || trakt != null || slug != null;
 
-  Map<String, dynamic> toJson() => {
-    if (trakt != null) 'trakt': trakt,
-    if (slug != null) 'slug': slug,
-    if (imdb != null) 'imdb': imdb,
-    if (tmdb != null) 'tmdb': tmdb,
-    if (tvdb != null) 'tvdb': tvdb,
-  };
+  Map<String, dynamic> toJson() => _$TraktIdsToJson(this);
 
-  factory TraktIds.fromJson(Map<String, dynamic> json) => TraktIds(
-    trakt: (json['trakt'] as num?)?.toInt(),
-    slug: json['slug'] as String?,
-    imdb: json['imdb'] as String?,
-    tmdb: (json['tmdb'] as num?)?.toInt(),
-    tvdb: (json['tvdb'] as num?)?.toInt(),
-  );
+  factory TraktIds.fromJson(Map<String, dynamic> json) => _$TraktIdsFromJson(json);
 
   factory TraktIds.fromExternal(ExternalIds ids) => TraktIds(imdb: ids.imdb, tmdb: ids.tmdb, tvdb: ids.tvdb);
 }

lib/models/trakt/trakt_ids.g.dart

@@ -0,0 +1,23 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'trakt_ids.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+TraktIds _$TraktIdsFromJson(Map<String, dynamic> json) => TraktIds(
+  trakt: (json['trakt'] as num?)?.toInt(),
+  slug: json['slug'] as String?,
+  imdb: json['imdb'] as String?,
+  tmdb: (json['tmdb'] as num?)?.toInt(),
+  tvdb: (json['tvdb'] as num?)?.toInt(),
+);
+
+Map<String, dynamic> _$TraktIdsToJson(TraktIds instance) => <String, dynamic>{
+  'trakt': ?instance.trakt,
+  'slug': ?instance.slug,
+  'imdb': ?instance.imdb,
+  'tmdb': ?instance.tmdb,
+  'tvdb': ?instance.tvdb,
+};