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/UI/Theme/Accent.swift

@@ -115,6 +115,14 @@ private struct TapAndHold: ViewModifier {
             .animation(.easeOut(duration: 0.1), value: pressed)
             .onTapGesture(perform: onTap)
             .onLongPressGesture(perform: { onHold?() }, onPressingChanged: { pressed = $0 })
+            // One element to VoiceOver, a button, with the long press as an
+            // action: a gesture is not something it can perform.
+            .accessibilityElement(children: .combine)
+            .accessibilityAddTraits(.isButton)
+            .accessibilityAction(.default, onTap)
+            .accessibilityActions {
+                if let onHold { Button("More", action: onHold) }
+            }
     }
 }