Compose screen VoiceOver improvements

Tusker/Screens/Compose/ComposeCurrentAccount.swift

@@ -22,7 +22,7 @@ struct ComposeCurrentAccount: View {
             ComposeAvatarImageView(url: account?.avatar)
                 .frame(width: 50, height: 50)
                 .cornerRadius(preferences.avatarStyle.cornerRadiusFraction * 50)
-                .accessibility(label: Text(account != nil ? "\(account!.displayName) avatar" : "Avatar"))
+                .accessibilityHidden(true)
             
             if let id = account?.id,
                let account = mastodonController.persistentContainer.account(for: id) {

Tusker/Screens/Compose/ComposeHostingController.swift

@@ -107,6 +107,11 @@ class ComposeHostingController: UIHostingController<ComposeHostingController.Wra
         }
     }
     
+    override func accessibilityPerformEscape() -> Bool {
+        dismissCompose(mode: .cancel)
+        return true
+    }
+    
     // MARK: Duckable
     
     func duckableViewControllerWillAnimateDuck(withDuration duration: CGFloat, afterDelay delay: CGFloat) {

Tusker/Screens/Compose/ComposeReplyView.swift

@@ -80,6 +80,7 @@ struct ComposeReplyView: View {
             .frame(width: 50, height: 50)
             .cornerRadius(preferences.avatarStyle.cornerRadiusFraction * 50)
             .offset(x: 0, y: offset)
+            .accessibilityHidden(true)
     }
     
 }

Tusker/Screens/Compose/ComposeView.swift

@@ -202,11 +202,16 @@ struct ComposeView: View {
     private var header: some View {
         HStack(alignment: .top) {
             ComposeCurrentAccount()
+                .accessibilitySortPriority(1)
+            
             Spacer()
+            
             Text(verbatim: charactersRemaining.description)
                 .foregroundColor(charactersRemaining < 0 ? .red : .secondary)
                 .font(Font.body.monospacedDigit())
                 .accessibility(label: Text(charactersRemaining < 0 ? "\(-charactersRemaining) characters too many" : "\(charactersRemaining) characters remaining"))
+                // this should come first, so VO users can back to it from the main compose text view
+                .accessibilitySortPriority(0)
         }.frame(height: 50)
     }