Fix ContentUnavailableView centering on Apple TV

On tvOS, ContentUnavailableView inside a Group doesn't expand to fill
available space — it sizes to content and aligns top-leading. Add
.frame(maxWidth: .infinity, maxHeight: .infinity) to all instances
so they center correctly in their parent containers.

Yattee/Views/Home/BookmarksListView.swift

@@ -180,12 +180,14 @@ struct BookmarksListView: View {
     private var emptyView: some View {
         if !searchText.isEmpty {
             ContentUnavailableView.search(text: searchText)
+            .frame(maxWidth: .infinity, maxHeight: .infinity)
         } else {
             ContentUnavailableView {
                 Label(String(localized: "home.bookmarks.title"), systemImage: "bookmark")
             } description: {
                 Text(String(localized: "home.bookmarks.empty"))
             }
+            .frame(maxWidth: .infinity, maxHeight: .infinity)
         }
     }
 

Yattee/Views/Home/ContinueWatchingView.swift

@@ -108,6 +108,7 @@ struct ContinueWatchingView: View {
         } description: {
             Text(String(localized: "home.continueWatching.empty"))
         }
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
     }
 
     private var listContent: some View {

Yattee/Views/Home/HistoryListView.swift

@@ -206,12 +206,14 @@ struct HistoryListView: View {
     private var emptyView: some View {
         if !searchText.isEmpty {
             ContentUnavailableView.search(text: searchText)
+            .frame(maxWidth: .infinity, maxHeight: .infinity)
         } else {
             ContentUnavailableView {
                 Label(String(localized: "home.history.title"), systemImage: "clock")
             } description: {
                 Text(String(localized: "home.history.empty"))
             }
+            .frame(maxWidth: .infinity, maxHeight: .infinity)
         }
     }
 

Yattee/Views/Home/PlaylistsListView.swift

@@ -76,6 +76,7 @@ struct PlaylistsListView: View {
             }
             .buttonStyle(.borderedProminent)
         }
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
     }
 
     // MARK: - List Content