Make tvOS detail dismiss button opt-in and unstick more views

TVSidebarDetailContainer now exposes a showsDismissButton flag instead of
always attaching a Done toolbar item. The button is only enabled where a
view can end up with no focusable element on its own — Device
Capabilities (informational rows) and the Import Playlists/Subscriptions
flows.

Wrap Contributors, Translators, Acknowledgements, and Device Capabilities
destinations in TVSidebarDetailContainer for the consistent sidebar look,
and make the Translators/Acknowledgements rows focusable on tvOS by
wrapping them in Buttons so the Menu remote button can pop the stack.

Yattee/Views/Settings/AcknowledgementsView.swift

@@ -26,9 +26,6 @@ struct AcknowledgementsView: View {
 
     @ViewBuilder
     private func dependencyLink(_ name: String, url: String) -> some View {
-        #if os(tvOS)
-        Text(name)
-        #else
         Button {
             if let url = URL(string: url) {
                 openURL(url)
@@ -37,15 +34,16 @@ struct AcknowledgementsView: View {
             HStack {
                 Text(name)
                 Spacer()
+                #if !os(tvOS)
                 Image(systemName: "arrow.up.right")
                     .foregroundStyle(.secondary)
+                #endif
             }
             .contentShape(Rectangle())
         }
         #if os(macOS)
         .buttonStyle(.plain)
         #endif
-        #endif
     }
 }