Extract TVSidebarDetailContainer to its own file

Now used by multiple tvOS tabs beyond Settings, so move it out of
SettingsView.swift into Views/Components/ where reusable view primitives
live.

Yattee/Views/Components/TVSidebarDetailContainer.swift

@@ -0,0 +1,51 @@
+//
+//  TVSidebarDetailContainer.swift
+//  Yattee
+//
+//  Decorates a tvOS detail screen with a fixed 400pt left sidebar showing
+//  a large SF Symbol and a title, matching the look of tvOS settings.
+//
+
+#if os(tvOS)
+import SwiftUI
+
+struct TVSidebarDetailContainer<Content: View>: View {
+    let content: Content
+    var systemImage: String?
+    var title: String?
+
+    init(systemImage: String? = nil, title: String? = nil, @ViewBuilder content: () -> Content) {
+        self.content = content()
+        self.systemImage = systemImage
+        self.title = title
+    }
+
+    var body: some View {
+        content
+            .safeAreaInset(edge: .leading) {
+                if let systemImage {
+                    VStack(spacing: 16) {
+                        Spacer()
+                        Image(systemName: systemImage)
+                            .font(.system(size: 80))
+                            .foregroundStyle(.secondary)
+                        if let title {
+                            Text(title)
+                                .font(.title3)
+                                .fontWeight(.semibold)
+                                .foregroundStyle(.secondary)
+                                .multilineTextAlignment(.center)
+                        }
+                        Spacer()
+                    }
+                    .frame(width: 400)
+                    .allowsHitTesting(false)
+                } else {
+                    Spacer()
+                        .frame(width: 400)
+                        .allowsHitTesting(false)
+                }
+            }
+    }
+}
+#endif

Yattee/Views/Settings/SettingsView.swift

@@ -384,50 +384,6 @@ enum SettingsSection: String, CaseIterable, Identifiable {
     }
 }
 
-// MARK: - tvOS Sidebar Detail Container
-
-#if os(tvOS)
-struct TVSidebarDetailContainer<Content: View>: View {
-    let content: Content
-    var systemImage: String?
-    var title: String?
-
-    init(systemImage: String? = nil, title: String? = nil, @ViewBuilder content: () -> Content) {
-        self.content = content()
-        self.systemImage = systemImage
-        self.title = title
-    }
-
-    var body: some View {
-        content
-            .safeAreaInset(edge: .leading) {
-                if let systemImage {
-                    VStack(spacing: 16) {
-                        Spacer()
-                        Image(systemName: systemImage)
-                            .font(.system(size: 80))
-                            .foregroundStyle(.secondary)
-                        if let title {
-                            Text(title)
-                                .font(.title3)
-                                .fontWeight(.semibold)
-                                .foregroundStyle(.secondary)
-                                .multilineTextAlignment(.center)
-                        }
-                        Spacer()
-                    }
-                    .frame(width: 400)
-                    .allowsHitTesting(false)
-                } else {
-                    Spacer()
-                        .frame(width: 400)
-                        .allowsHitTesting(false)
-                }
-            }
-    }
-}
-#endif
-
 #Preview {
     SettingsView()
         .appEnvironment(.preview)