removeLike method
Implementation
Future<UserAccount> removeLike({
required String email,
required String packageName,
}) async {
final users = await _readUsers();
final index = users.indexWhere((u) => u.email == email);
if (index < 0) throw StateError('user not found');
final user = users[index];
final likes = [...user.likedPackages]..remove(packageName);
final updated =
user.copyWith(likedPackages: likes, updatedAt: DateTime.now());
users[index] = updated;
await _writeUsers(users);
await addActivity(
email: email,
action: 'like_remove',
message: 'Removed like for $packageName',
);
return updated;
}