Dismiss tvOS sidebar detail pages when sidebar selection changes

tvOS's sidebarAdaptable TabView leaves the previously-pushed detail view
visible after the user picks another sidebar item, until they manually
press Menu. Broadcast a notification on tab change so any pushed
TVSidebarDetailContainer dismisses itself, and reset each tab's
NavigationPath. Also drop a redundant inner NavigationStack in the tvOS
SettingsView so subpages register on the tab's outer stack.

Yattee/Views/Components/TVSidebarDetailContainer.swift

@@ -9,6 +9,10 @@
 #if os(tvOS)
 import SwiftUI
 
+extension Notification.Name {
+    static let yatteeTVForcePopDetail = Notification.Name("yatteeTVForcePopDetail")
+}
+
 struct TVSidebarDetailContainer<Content: View>: View {
     let content: Content
     var systemImage: String?
@@ -65,6 +69,9 @@ struct TVSidebarDetailContainer<Content: View>: View {
                     }
                 }
             }
+            .onReceive(NotificationCenter.default.publisher(for: .yatteeTVForcePopDetail)) { _ in
+                dismiss()
+            }
     }
 }
 #endif