Revert "Drop iOS 14 and macOS 11 support"

This reverts commit dcef7f47ff.

Shared/Navigation/AccountViewButton.swift

@@ -15,10 +15,14 @@ struct AccountViewButton: View {
             } label: {
                 HStack(spacing: 6) {
                     if !accountPickerDisplaysUsername || !(model.current?.isPublic ?? true) {
-                        if let name = model.current?.app?.rawValue.capitalized {
-                            Image(name)
-                                .resizable()
-                                .frame(width: accountImageSize, height: accountImageSize)
+                        if #available(iOS 15, macOS 12, *) {
+                            if let name = model.current?.app?.rawValue.capitalized {
+                                Image(name)
+                                    .resizable()
+                                    .frame(width: accountImageSize, height: accountImageSize)
+                            } else {
+                                Image(systemName: "globe")
+                            }
                         } else {
                             Image(systemName: "globe")
                         }

Shared/Navigation/AppSidebarPlaylists.swift

@@ -38,6 +38,7 @@ struct AppSidebarPlaylists: View {
 
         if accounts.app.userPlaylistsEndpointIncludesVideos, !playlist.videos.isEmpty {
             label
+                .backport
                 .badge(Text("\(playlist.videos.count)"))
         } else {
             label

Shared/Navigation/AppSidebarSubscriptions.swift

@@ -33,6 +33,7 @@ struct AppSidebarSubscriptions: View {
                         Spacer()
                     }
                     .lineLimit(1)
+                    .backport
                     .badge(showUnwatchedFeedBadges ? feedCount.unwatchedByChannelText(channel) : nil)
                 }
                 .contextMenu {

Shared/Navigation/AppTabNavigation.swift

@@ -95,6 +95,7 @@ struct AppTabNavigation: View {
                 .accessibility(label: Text("Subscriptions"))
         }
         .tag(TabSelection.subscriptions)
+        .backport
         .badge(showUnwatchedFeedBadges ? feedCount.unwatchedText : nil)
     }
 

Shared/Navigation/Sidebar.swift

@@ -81,6 +81,7 @@ struct Sidebar: View {
                         Label("Subscriptions", systemImage: "star.circle")
                             .accessibility(label: Text("Subscriptions"))
                     }
+                    .backport
                     .badge(showUnwatchedFeedBadges ? feedCount.unwatchedText : nil)
                     .contextMenu {
                         playUnwatchedButton