Remove unused code

Model/Accounts/AccountsModel.swift

@@ -140,15 +140,4 @@ final class AccountsModel: ObservableObject {
             KeychainModel.shared.getAccountKey(account, "password")
         )
     }
-
-    static func removeDefaultsCredentials(_ account: Account) {
-        if let accountIndex = Defaults[.accounts].firstIndex(where: { $0.id == account.id }) {
-            var account = Defaults[.accounts][accountIndex]
-            account.name = ""
-            account.username = ""
-            account.password = nil
-
-            Defaults[.accounts][accountIndex] = account
-        }
-    }
 }

Model/Channel.swift

@@ -33,21 +33,6 @@ struct Channel: Identifiable, Hashable {
             }
         }
 
-        var contentItemType: ContentItem.ContentType {
-            switch self {
-            case .videos:
-                return .video
-            case .playlists:
-                return .playlist
-            case .livestreams:
-                return .video
-            case .shorts:
-                return .video
-            case .channels:
-                return .channel
-            }
-        }
-
         var systemImage: String {
             switch self {
             case .videos: