Implement channel navigation for Jellyfin plugin channels

- Modified ItemLibraryViewModel to detect channel/channelFolderItem types
- Added getChannelItems() method to use Paths.getChannelItems API for channels
- Channel folders now use channelID and folderID parameters correctly
- Modified PagingLibraryView to route .channelFolderItem to library grid view

This enables proper navigation for Jellyfin.Xtream plugin channels:
Channel → Grid of Categories → Grid of Content → Item Detail

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Shared/ViewModels/LibraryViewModel/ItemLibraryViewModel.swift

@@ -19,6 +19,11 @@ final class ItemLibraryViewModel: PagingLibraryViewModel<BaseItemDto> {
 
     override func get(page: Int) async throws -> [BaseItemDto] {
 
+        // Use channel API for channels and channel folders
+        if let parent = parent as? BaseItemDto, parent.type == .channel || parent.type == .channelFolderItem {
+            return try await getChannelItems(page: page, parent: parent)
+        }
+
         let parameters = itemParameters(for: page)
         let request = Paths.getItemsByUserID(userID: userSession.user.id, parameters: parameters)
         let response = try await userSession.client.send(request)
@@ -46,6 +51,33 @@ final class ItemLibraryViewModel: PagingLibraryViewModel<BaseItemDto> {
         return items
     }
 
+    // MARK: getChannelItems
+
+    private func getChannelItems(page: Int, parent: BaseItemDto) async throws -> [BaseItemDto] {
+
+        guard let channelID = parent.channelID ?? parent.id else {
+            return []
+        }
+
+        var parameters = Paths.GetChannelItemsParameters()
+        parameters.userID = userSession.user.id
+        parameters.fields = .MinimumFields
+
+        // If parent is a channel folder, set the folderID
+        if parent.type == .channelFolderItem {
+            parameters.folderID = parent.id
+        }
+
+        // Page size
+        parameters.limit = pageSize
+        parameters.startIndex = page * pageSize
+
+        let request = Paths.getChannelItems(channelID: channelID, parameters: parameters)
+        let response = try await userSession.client.send(request)
+
+        return response.value.items ?? []
+    }
+
     // MARK: item parameters
 
     private func itemParameters(for page: Int?) -> Paths.GetItemsByUserIDParameters {

jellypig tvOS/Views/PagingLibraryView/PagingLibraryView.swift

@@ -101,7 +101,7 @@ struct PagingLibraryView<Element: Poster & Identifiable>: View {
 
     private func select(item: BaseItemDto) {
         switch item.type {
-        case .collectionFolder, .folder:
+        case .collectionFolder, .folder, .channelFolderItem:
             let viewModel = ItemLibraryViewModel(parent: item, filters: .default)
             router.route(to: \.library, viewModel)
         case .person: