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/LibraryView.swift

@@ -541,7 +541,9 @@ private struct ContinueCard: View {
 
     var body: some View {
         VStack(alignment: .leading, spacing: 0) {
+            // Named by the text under it; read as well, the name came twice.
             RemoteArtwork(entry.episode.stillUrl ?? entry.title.backdropUrl, entry.title.displayName, fallback: entry.episode.thumbnailSource)
+                .accessibilityHidden(true)
                 .aspectRatio(16 / 9, contentMode: .fit)
                 .overlay(alignment: .bottom) {
                     if let progress = entry.episode.progress { AccentProgress(progress: progress) }
@@ -571,6 +573,7 @@ struct PosterTile: View {
     var body: some View {
         VStack(alignment: .leading, spacing: 0) {
             RemoteArtwork(title.posterUrl ?? title.backdropUrl, title.displayName, fallback: title.thumbnailSource)
+                .accessibilityHidden(true)
                 .aspectRatio(2 / 3, contentMode: .fit)
                 .clipShape(RoundedRectangle(cornerRadius: Corner.standard))
                 .overlay(alignment: .topTrailing) {
@@ -581,6 +584,7 @@ struct PosterTile: View {
                             .padding(.horizontal, 6).padding(.vertical, 2)
                             .background(.black.opacity(0.7), in: RoundedRectangle(cornerRadius: Corner.standard))
                             .padding(6)
+                            .accessibilityLabel("and \(folded) more")
                     }
                 }
             Text(title.displayName).textStyle(.bodyMedium, semibold: true).foregroundStyle(scheme.onSurface)

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) }
+            }
     }
 }