refactor: migrate models to freezed + json_serializable

lib/profiles/profile_connection.dart

@@ -1,3 +1,7 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'profile_connection.freezed.dart';
+
 /// A binding between a [Profile] and a [Connection], carrying the
 /// per-profile user-level token used when the profile is active.
 ///
@@ -9,47 +13,19 @@
 ///
 /// For Jellyfin: [userToken] mirrors the Connection's accessToken (one
 /// user per connection); [userIdentifier] is the Jellyfin user id.
-class ProfileConnection {
-  final String profileId;
-  final String connectionId;
-  final String? userToken;
-  final String userIdentifier;
-  final bool isDefault;
-  final DateTime? tokenAcquiredAt;
-  final DateTime? lastUsedAt;
+@freezed
+sealed class ProfileConnection with _$ProfileConnection {
+  const ProfileConnection._();
 
-  const ProfileConnection({
-    required this.profileId,
-    required this.connectionId,
-    this.userToken,
-    required this.userIdentifier,
-    this.isDefault = false,
-    this.tokenAcquiredAt,
-    this.lastUsedAt,
-  });
+  const factory ProfileConnection({
+    required String profileId,
+    required String connectionId,
+    String? userToken,
+    required String userIdentifier,
+    @Default(false) bool isDefault,
+    DateTime? tokenAcquiredAt,
+    DateTime? lastUsedAt,
+  }) = _ProfileConnection;
 
   bool get hasToken => userToken != null && userToken!.isNotEmpty;
-
-  ProfileConnection copyWith({
-    String? profileId,
-    String? connectionId,
-    String? userToken,
-    bool clearUserToken = false,
-    String? userIdentifier,
-    bool? isDefault,
-    DateTime? tokenAcquiredAt,
-    bool clearTokenAcquiredAt = false,
-    DateTime? lastUsedAt,
-    bool clearLastUsedAt = false,
-  }) {
-    return ProfileConnection(
-      profileId: profileId ?? this.profileId,
-      connectionId: connectionId ?? this.connectionId,
-      userToken: clearUserToken ? null : (userToken ?? this.userToken),
-      userIdentifier: userIdentifier ?? this.userIdentifier,
-      isDefault: isDefault ?? this.isDefault,
-      tokenAcquiredAt: clearTokenAcquiredAt ? null : (tokenAcquiredAt ?? this.tokenAcquiredAt),
-      lastUsedAt: clearLastUsedAt ? null : (lastUsedAt ?? this.lastUsedAt),
-    );
-  }
 }