feat(android,ios): read each library tile once, with its long press as an action

A poster's artwork carried the title's name and so did the text under
it, so a screen reader said the name twice. The artwork is now left out
where the text names it, and a folded franchise tile says how many more
it stands for. The long press that opens a tile's menu is offered as an
action, labelled on Android and as More on iOS, where tapAndHold also
makes the whole tile one button. On iOS the app behind a full-screen
player is hidden from VoiceOver, which walked the library behind the
picture.

ios/ProtonStream/App/ProtonStreamApp.swift

@@ -107,6 +107,9 @@ struct RootView: View {
                 .animation(.easeInOut(duration: 0.2), value: model.activity)
             }
             .background(scheme.background.ignoresSafeArea())
+            // Covered by the player, but still there to VoiceOver, which
+            // would otherwise walk the library behind the picture.
+            .accessibilityHidden(host.isOpen && !host.minimized)
         }
         .overlay {
             // Over the shell rather than instead of it: the page behind stays