feat(ios): port the Android client to SwiftUI

The iOS client is now a screen-for-screen port of the Android app over the
same pstr-android UniFFI surface, with no Rust changes: Library, title page,
History, Shares (public links and Drive folders), Downloads and Settings,
with the same strings, undo snackbars and two-pane layout on wide screens.

- Theme from the engine's palette (Material role names, Inter, the same
  type ramp and corners), repainted live from the appearance settings.
- Account sign-in with two-factor code, mailbox password and the Proton
  CAPTCHA in a non-persistent WKWebView, the Drive folder browser, and
  watch-history sync every five minutes, after sign-in, on player close and
  when the app leaves the screen.
- Player over libmpv: resume, progress saved every 5 s, autoplay with the
  up-next card, skip and auto-skip from the chapter plan, track, speed,
  volume and episode pickers, landscape lock, mini transport, and
  lock-screen controls with interruption and route-change handling.
- Offline downloads with the Android record format, free-space floor,
  retries, transfer rate and the Wi-Fi-only policy; interrupted transfers
  resume at next launch.
- Config, data and download state are excluded from backup, as Android's
  allowBackup=false: a restore would bring shares back without their
  Keychain secrets and give two devices one sync identity.

Picture-in-picture, the share sheet and background downloads are not
possible the same way on iOS; docs/IOS.md lists why and what replaces them.

Adds XCTest ports of the Android unit tests, a `test` command to
scripts/build-ios.sh, the app icon and its render script, and an iOS
workflow on macos-15 that runs the tests and builds the unsigned .ipa.

ios/ProtonStream/Player/PlayerView.swift

@@ -0,0 +1,614 @@
+import SwiftUI
+import UIKit
+
+/// How long the controls stay up after a tap.
+private let controlsSeconds = 4.0
+
+/// The narrowest layout the in-app volume slider is worth the room it costs.
+/// Below it — a phone held upright — the hardware volume buttons are the
+/// better answer.
+private let volumeSliderMinWidth: CGFloat = 600
+
+/// The rates worth offering. A short list rather than a slider: the useful
+/// rates are a handful of ratios, and a slider lands on 1.07 as often as 1.0.
+private let speeds = [0.5, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0]
+
+/// The player, over the whole window, notch included.
+///
+/// The episode itself lives in `PlayerHost`, so this view can go — minimised to
+/// the mini transport, or with the app in the background — while it plays on.
+struct PlayerView: View {
+    let host: PlayerHost
+    let player: MpvPlayer
+    @Environment(\.scheme) private var scheme
+    @State private var showControls = true
+    @State private var hideTask: Task<Void, Never>?
+    @State private var landscapeLocked = OrientationLock.landscape
+    @State private var sheet: PlayerSheet?
+
+    var body: some View {
+        GeometryReader { geometry in
+            ZStack {
+                Color.black.ignoresSafeArea()
+                MpvView(player: player).ignoresSafeArea()
+                Color.clear
+                    .contentShape(Rectangle())
+                    .ignoresSafeArea()
+                    .onTapGesture { setControls(!showControls) }
+
+                VStack(spacing: 0) {
+                    if showControls { topBar.transition(.opacity) }
+                    Spacer(minLength: 0)
+                    if showControls {
+                        PlayerControls(
+                            host: host,
+                            player: player,
+                            roomForVolume: geometry.size.width >= volumeSliderMinWidth,
+                            landscapeLocked: landscapeLocked,
+                            onRotate: { landscapeLocked = OrientationLock.toggle() },
+                            onSheet: { sheet = $0 },
+                            onInteract: { setControls(true) }
+                        )
+                        .transition(.opacity)
+                    }
+                }
+
+                // Drawn whether or not the rest of the controls are up: an
+                // opening lasts ninety seconds, and a button you have to wake
+                // with a tap is one nobody reaches in time.
+                VStack(alignment: .trailing, spacing: 8) {
+                    Spacer()
+                    if let offer = host.offer, !host.autoSkip {
+                        Button(offer.label) { host.seek(to: offer.target) }.buttonStyle(.tonal)
+                    }
+                    UpNextCard(
+                        next: host.next,
+                        visible: host.autoplay && !player.paused && host.chapters.creditsStart.map { player.position >= $0 } == true,
+                        onPlayNow: host.advance
+                    )
+                }
+                .frame(maxWidth: .infinity, alignment: .trailing)
+                .padding(.trailing, 16)
+                .padding(.bottom, showControls ? 132 : 24)
+
+                // Only while nothing else explains the still picture: an error
+                // is the more useful thing to say.
+                if player.stalled && host.playbackError == nil {
+                    VStack(spacing: 12) {
+                        ProgressView().controlSize(.large).tint(scheme.primary)
+                        if player.buffering {
+                            Text(player.cachePercent > 0 ? "Buffering… \(Int(player.cachePercent.rounded()))%" : "Buffering…")
+                                .textStyle(.labelMedium).foregroundStyle(scheme.onSurface)
+                        }
+                    }
+                    .padding(20)
+                    .background(scheme.surfaceContainerHighest, in: RoundedRectangle(cornerRadius: Corner.standard))
+                }
+
+                if let message = host.playbackError ?? player.problem {
+                    VStack(spacing: 4) {
+                        Text(message).foregroundStyle(scheme.onErrorContainer).multilineTextAlignment(.center)
+                        // Dismissible, because the message is not always fatal
+                        // — a subtitle track that failed to load leaves an
+                        // episode that plays perfectly well behind it.
+                        Button("Dismiss", action: host.dismissProblem)
+                            .buttonStyle(.quiet)
+                            .tint(scheme.onErrorContainer)
+                    }
+                    .textStyle(.bodyLarge)
+                    .padding(16)
+                    .background(scheme.errorContainer, in: RoundedRectangle(cornerRadius: Corner.standard))
+                    .padding(32)
+                }
+            }
+        }
+        .animation(.easeInOut(duration: 0.2), value: showControls)
+        .statusBarHidden(!showControls)
+        .persistentSystemOverlays(.hidden)
+        .onAppear { setControls(true) }
+        .onChange(of: player.paused) { setControls(showControls) }
+        .sheet(item: $sheet) { which in
+            switch which {
+            case .speed: SpeedSheet(current: host.speed, onSelect: host.setSpeed)
+            case .episodes: EpisodeSheet(episodes: host.episodes, playing: host.index, onSelect: host.jump)
+            case .chapters: ChapterSheet(chapters: host.chapters.entries, position: player.position) { host.seek(to: $0.start) }
+            case let .tracks(type):
+                TrackSheet(type: type, tracks: player.tracks.filter { $0.type == type }) { host.select(type: type, track: $0) }
+            }
+        }
+    }
+
+    private var topBar: some View {
+        HStack(spacing: 0) {
+            // Two ways out, because they mean different things: this leaves the
+            // video and keeps the episode playing, ✕ ends it.
+            IconButton("chevron.down", "Leave the video", tint: .white) {
+                // The rest of the app is not a landscape app.
+                landscapeLocked = false
+                OrientationLock.set(false)
+                host.minimized = true
+            }
+            // The episode leads and the show follows it: which episode is the
+            // thing a viewer who has just woken the controls is checking.
+            VStack(alignment: .leading, spacing: 0) {
+                Text(host.episode?.label ?? "").textStyle(.titleMedium).foregroundStyle(.white).lineLimit(1)
+                Text([host.title?.displayName, host.episode?.detail].compactMap { $0 }.filter { !$0.isEmpty }.joined(separator: "  •  "))
+                    .textStyle(.bodySmall).foregroundStyle(.white.opacity(0.7)).lineLimit(1)
+            }
+            .frame(maxWidth: .infinity, alignment: .leading)
+            IconButton("xmark", "Stop playback", tint: .white, action: host.close)
+            if player.duration > 0, player.duration - player.position >= 1 {
+                Text("\(clock(player.duration - player.position)) left")
+                    .textStyle(.labelMedium).foregroundStyle(.white.opacity(0.7))
+                    .padding(.leading, 12).padding(.trailing, 4)
+            }
+        }
+        .padding(.horizontal, 8)
+        .padding(.vertical, 4)
+        .background(scheme.scrim.opacity(0.45).ignoresSafeArea(edges: [.top, .horizontal]))
+    }
+
+    /// Show or hide the controls; shown and playing, they hide themselves.
+    private func setControls(_ shown: Bool) {
+        showControls = shown
+        hideTask?.cancel()
+        guard shown, !player.paused else { return }
+        hideTask = Task {
+            try? await Task.sleep(for: .seconds(controlsSeconds))
+            if !Task.isCancelled { showControls = false }
+        }
+    }
+}
+
+enum PlayerSheet: Identifiable {
+    case speed, episodes, chapters
+    case tracks(String)
+
+    var id: String {
+        switch self {
+        case .speed: "speed"
+        case .episodes: "episodes"
+        case .chapters: "chapters"
+        case let .tracks(type): "tracks-\(type)"
+        }
+    }
+}
+
+/// Everything the transport offers, in two rows: the seek bar on its own,
+/// then the transport cluster on the left, where a thumb already is, and the
+/// pickers on the right.
+private struct PlayerControls: View {
+    let host: PlayerHost
+    let player: MpvPlayer
+    let roomForVolume: Bool
+    let landscapeLocked: Bool
+    let onRotate: () -> Void
+    let onSheet: (PlayerSheet) -> Void
+    let onInteract: () -> Void
+    @Environment(\.scheme) private var scheme
+    // Where the thumb is while a finger is on it: a seek per drag step is a
+    // block fetch per drag step, and the thumb would snap back under the
+    // finger between readings.
+    @State private var scrubbing: Double?
+    @State private var dragVolume: Double?
+
+    var body: some View {
+        let duration = max(player.duration, 1)
+        VStack(spacing: 0) {
+            HStack(spacing: 8) {
+                Text(clock(scrubbing ?? player.position)).textStyle(.labelMedium).foregroundStyle(.white).monospacedDigit()
+                AccentTrack(
+                    value: Binding(
+                        get: { scrubbing ?? min(max(player.position, 0), duration) },
+                        set: { scrubbing = $0 }
+                    ),
+                    range: 0 ... duration,
+                    buffered: player.duration > 0 ? player.cachedUntil / player.duration : 0,
+                    ticks: player.duration > 0 && host.chapters.entries.count > 1
+                        ? host.chapters.entries.dropFirst().map { $0.start / player.duration } : [],
+                    onEditing: { editing in
+                        onInteract()
+                        if !editing, let target = scrubbing {
+                            host.seek(to: target)
+                            scrubbing = nil
+                        }
+                    }
+                )
+                Text(clock(player.duration)).textStyle(.labelMedium).foregroundStyle(.white).monospacedDigit()
+            }
+            HStack(spacing: 0) {
+                CompactIcon("backward.end.fill", "Previous episode", enabled: host.index > 0, action: host.retreat)
+                CompactIcon("gobackward.10", "Back ten seconds") { host.seek(to: player.position - 10) }
+                Button { host.setPaused(!player.paused); onInteract() } label: {
+                    Image(systemName: player.paused ? "play.fill" : "pause.fill")
+                        .font(.system(size: 30))
+                        .foregroundStyle(.white)
+                        .frame(width: 48, height: 48)
+                }
+                .accessibilityLabel(player.paused ? "Play" : "Pause")
+                CompactIcon("goforward.30", "Forward thirty seconds") { host.seek(to: player.position + 30) }
+                CompactIcon("forward.end.fill", "Next episode", enabled: host.next != nil, action: host.advance)
+                Spacer(minLength: 4)
+                if host.episodes.count > 1 {
+                    CompactIcon("rectangle.stack", "Episodes") { onSheet(.episodes) }
+                }
+                if host.chapters.entries.count > 1 {
+                    CompactIcon("list.bullet", "Chapters") { onSheet(.chapters) }
+                }
+                CompactIcon("speedometer", "Playback speed") { onSheet(.speed) }
+                CompactIcon("waveform", "Audio track") { onSheet(.tracks("audio")) }
+                CompactIcon("captions.bubble", "Subtitles") { onSheet(.tracks("sub")) }
+                CompactIcon(player.muted ? "speaker.slash.fill" : "speaker.wave.2.fill", "Mute") {
+                    player.setMuted(!player.muted)
+                    host.rememberVolume(muted: !player.muted)
+                }
+                // The app's own volume, which is not the device's: a file
+                // mastered quiet is turned up here and stays up for the next.
+                if roomForVolume {
+                    Slider(
+                        value: Binding(
+                            get: { dragVolume ?? min(max(player.volume, 0), 100) },
+                            set: { dragVolume = $0; player.setVolume($0) }
+                        ),
+                        in: 0 ... 100
+                    ) { editing in
+                        onInteract()
+                        if !editing, let chosen = dragVolume {
+                            dragVolume = nil
+                            host.rememberVolume(volume: chosen)
+                        }
+                    }
+                    .tint(scheme.primary)
+                    .frame(width: 96)
+                }
+                CompactIcon(
+                    landscapeLocked ? "arrow.down.right.and.arrow.up.left" : "arrow.up.left.and.arrow.down.right",
+                    landscapeLocked ? "Unlock rotation" : "Lock to landscape",
+                    action: onRotate
+                )
+            }
+        }
+        .padding(.horizontal, 12)
+        .padding(.vertical, 4)
+        .background(scheme.scrim.opacity(0.68).ignoresSafeArea(edges: [.bottom, .horizontal]))
+    }
+}
+
+private struct CompactIcon: View {
+    let icon: String
+    let label: String
+    var enabled = true
+    let action: () -> Void
+
+    init(_ icon: String, _ label: String, enabled: Bool = true, action: @escaping () -> Void) {
+        self.icon = icon
+        self.label = label
+        self.enabled = enabled
+        self.action = action
+    }
+
+    var body: some View {
+        Button(action: action) {
+            Image(systemName: icon)
+                .font(.system(size: 19))
+                .foregroundStyle(enabled ? Color.white : Color.white.opacity(0.35))
+                .frame(width: 40, height: 40)
+                .contentShape(Rectangle())
+        }
+        .buttonStyle(.plain)
+        .disabled(!enabled)
+        .accessibilityLabel(label)
+    }
+}
+
+/// The countdown into the next episode, shown once the credits run starts.
+///
+/// "Watch till the end" holds for the rest of the file: someone who wants the
+/// post-credits scene should have to say so once, not once every ten seconds.
+private struct UpNextCard: View {
+    let next: EpisodeRecord?
+    let visible: Bool
+    let onPlayNow: () -> Void
+    @Environment(\.scheme) private var scheme
+    @State private var held = false
+    @State private var remaining = upNextSeconds
+    @State private var heldFor: String?
+
+    var body: some View {
+        let showing = visible && next != nil && !(held && heldFor == next?.linkId)
+        Group {
+            if showing, let upNext = next {
+                VStack(alignment: .leading, spacing: 4) {
+                    HStack(spacing: 12) {
+                        // The next episode's still, so the card says which
+                        // episode without being read; the ring over it is both
+                        // the countdown and the button that skips it.
+                        Button(action: onPlayNow) {
+                            RemoteArtwork(upNext.stillUrl, upNext.label, fallback: upNext.thumbnailSource, labelled: false)
+                                .frame(width: 112)
+                                .aspectRatio(16 / 9, contentMode: .fit)
+                                .overlay {
+                                    ZStack {
+                                        Circle().fill(.black.opacity(0.5))
+                                        Circle().stroke(.white.opacity(0.25), lineWidth: 3)
+                                        Circle()
+                                            .trim(from: 0, to: Double(remaining) / Double(upNextSeconds))
+                                            .stroke(.white, style: StrokeStyle(lineWidth: 3, lineCap: .round))
+                                            .rotationEffect(.degrees(-90))
+                                            .animation(.linear(duration: 1), value: remaining)
+                                        Image(systemName: "play.fill").foregroundStyle(.white)
+                                    }
+                                    .frame(width: 40, height: 40)
+                                }
+                                .clipShape(RoundedRectangle(cornerRadius: Corner.standard))
+                        }
+                        .buttonStyle(.plain)
+                        .accessibilityLabel("Play now")
+                        VStack(alignment: .leading, spacing: 2) {
+                            Text("Up next in \(remaining)s").textStyle(.labelMedium).foregroundStyle(scheme.onSurfaceVariant)
+                            Text(upNext.providerName ?? upNext.label).textStyle(.titleSmall).foregroundStyle(scheme.onSurface).lineLimit(2)
+                        }
+                    }
+                    Button("Watch till the end") {
+                        held = true
+                        heldFor = upNext.linkId
+                    }
+                    .buttonStyle(.quiet)
+                }
+                .padding(12)
+                .frame(width: 280)
+                .background(scheme.surfaceContainerHighest, in: RoundedRectangle(cornerRadius: Corner.standard))
+                .task(id: upNext.linkId) {
+                    remaining = upNextSeconds
+                    while remaining > 0 {
+                        try? await Task.sleep(for: .seconds(1))
+                        if Task.isCancelled { return }
+                        remaining -= 1
+                    }
+                    onPlayNow()
+                }
+            }
+        }
+    }
+}
+
+private struct SpeedSheet: View {
+    let current: Double
+    let onSelect: (Double) -> Void
+    @Environment(\.dismiss) private var dismiss
+
+    var body: some View {
+        DialogSheet("Playback speed") {
+            ForEach(speeds, id: \.self) { rate in
+                Button {
+                    onSelect(rate)
+                    dismiss()
+                } label: {
+                    Text((abs(rate - current) < 0.001 ? "✓  " : "") + (rate == 1 ? "Normal" : "\(rate.formatted())×"))
+                        .frame(maxWidth: .infinity)
+                }
+                .buttonStyle(.edgedWide)
+            }
+        } buttons: {
+            Button("Close") { dismiss() }.buttonStyle(.tonal)
+        }
+    }
+}
+
+private struct ChapterSheet: View {
+    let chapters: [ChapterEntry]
+    let position: Double
+    let onSelect: (ChapterEntry) -> Void
+    @Environment(\.dismiss) private var dismiss
+
+    var body: some View {
+        let current = chapters.lastIndex { position + 0.001 >= $0.start }
+        DialogSheet("Chapters") {
+            ForEach(Array(chapters.enumerated()), id: \.element.index) { position, chapter in
+                Button {
+                    onSelect(chapter)
+                    dismiss()
+                } label: {
+                    Text((position == current ? "✓  " : "") + "\(clock(chapter.start))  \(chapter.label)")
+                        .lineLimit(1)
+                        .frame(maxWidth: .infinity, alignment: .leading)
+                }
+                .buttonStyle(.edgedWide)
+            }
+        } buttons: {
+            Button("Close") { dismiss() }.buttonStyle(.tonal)
+        }
+    }
+}
+
+private struct TrackSheet: View {
+    let type: String
+    let tracks: [MpvTrack]
+    let onSelect: (MpvTrack?) -> Void
+    @Environment(\.dismiss) private var dismiss
+
+    var body: some View {
+        DialogSheet(type == "audio" ? "Audio track" : "Subtitle track") {
+            if type == "sub" {
+                Button {
+                    onSelect(nil)
+                    dismiss()
+                } label: {
+                    Text(tracks.contains(where: \.selected) ? "Off" : "✓  Off").frame(maxWidth: .infinity, alignment: .leading)
+                }
+                .buttonStyle(.edgedWide)
+            }
+            ForEach(tracks) { track in
+                Button {
+                    onSelect(track)
+                    dismiss()
+                } label: {
+                    Text(track.selected ? "✓  \(track.label)" : track.label).frame(maxWidth: .infinity, alignment: .leading)
+                }
+                .buttonStyle(.edgedWide)
+            }
+        } buttons: {
+            Button("Close") { dismiss() }.buttonStyle(.tonal)
+        }
+    }
+}
+
+/// The title's episodes, from the player, opened scrolled to the one playing
+/// so the next few are in view. Each row has its still, its name, and whether
+/// it is playing, watched or part way.
+private struct EpisodeSheet: View {
+    let episodes: [EpisodeRecord]
+    let playing: Int
+    let onSelect: (Int) -> Void
+    @Environment(\.dismiss) private var dismiss
+    @Environment(\.scheme) private var scheme
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 0) {
+            Text("Episodes").textStyle(.titleMedium).foregroundStyle(scheme.onSurface)
+                .padding(.horizontal, 24).padding(.vertical, 8)
+            ScrollViewReader { reader in
+                ScrollView {
+                    LazyVStack(spacing: 0) {
+                        ForEach(Array(episodes.enumerated()), id: \.element.linkId) { position, episode in
+                            row(position, episode).id(position)
+                        }
+                    }
+                    .padding(.bottom, 24)
+                }
+                .onAppear { reader.scrollTo(max(playing - 1, 0), anchor: .top) }
+            }
+        }
+        .padding(.top, 20)
+        .presentationDetents([.medium, .large])
+        .presentationDragIndicator(.visible)
+        .presentationBackground(scheme.surfaceContainerLow)
+        .presentationCornerRadius(Corner.sheet)
+    }
+
+    private func row(_ position: Int, _ episode: EpisodeRecord) -> some View {
+        let current = position == playing
+        return Button {
+            dismiss()
+            onSelect(position)
+        } label: {
+            HStack(spacing: 12) {
+                RemoteArtwork(episode.stillUrl, episode.label, fallback: episode.thumbnailSource, labelled: false)
+                    .frame(width: 112)
+                    .aspectRatio(16 / 9, contentMode: .fit)
+                    .overlay(alignment: .bottom) {
+                        if let progress = episode.progress, !episode.watched, !current { AccentProgress(progress: progress) }
+                    }
+                    .clipShape(RoundedRectangle(cornerRadius: Corner.standard))
+                VStack(alignment: .leading, spacing: 2) {
+                    Text(episode.providerName ?? episode.label).textStyle(.titleSmall).foregroundStyle(scheme.onSurface).lineLimit(2)
+                    Text(current ? "Playing"
+                        : episode.watched ? "\(episode.label) · Watched"
+                        : episode.resumeAt != nil ? "\(episode.label) · Part way" : episode.label)
+                        .textStyle(.bodySmall)
+                        .foregroundStyle(current ? scheme.primary : scheme.onSurfaceVariant)
+                }
+                Spacer(minLength: 0)
+            }
+            .padding(.horizontal, 16)
+            .padding(.vertical, 8)
+            .background(current ? scheme.secondaryContainer : .clear)
+            .contentShape(Rectangle())
+        }
+        .buttonStyle(.plain)
+    }
+}
+
+/// The bar that says playback is still going, and gets back to it.
+///
+/// Leaving the player does not stop it — the episode keeps playing — so there
+/// has to be something on screen that says so and takes one tap to return to.
+struct MiniTransport: View {
+    let host: PlayerHost
+    @Environment(\.scheme) private var scheme
+
+    var body: some View {
+        if let episode = host.episode, let title = host.title {
+            HStack(spacing: 0) {
+                RemoteArtwork(title.posterUrl ?? title.backdropUrl, title.displayName, fallback: episode.thumbnailSource)
+                    .frame(width: 64)
+                    .aspectRatio(16 / 9, contentMode: .fit)
+                    .clipShape(RoundedRectangle(cornerRadius: Corner.standard))
+                VStack(alignment: .leading, spacing: 0) {
+                    Text(episode.label).textStyle(.bodyLarge, semibold: true).foregroundStyle(scheme.onSurface).lineLimit(1)
+                    Text(title.displayName).textStyle(.bodySmall).foregroundStyle(scheme.onSurfaceVariant).lineLimit(1)
+                }
+                .frame(maxWidth: .infinity, alignment: .leading)
+                .padding(.horizontal, 12)
+                let paused = host.player?.paused ?? true
+                IconButton(paused ? "play.fill" : "pause.fill", paused ? "Play" : "Pause", tint: scheme.onSurface) {
+                    host.setPaused(!paused)
+                }
+                IconButton("xmark", "Stop playback", tint: scheme.onSurface, action: host.close)
+            }
+            .padding(8)
+            .card()
+            .shadow(color: .black.opacity(0.25), radius: 8, y: 2)
+            .padding(.horizontal, 8)
+            .contentShape(Rectangle())
+            .onTapGesture { host.minimized = false }
+        }
+    }
+}
+
+/// The view libmpv draws into: its Metal layer, sized to this view.
+struct MpvView: UIViewRepresentable {
+    let player: MpvPlayer
+
+    func makeUIView(context _: Context) -> LayerView {
+        LayerView(layer: player.layer)
+    }
+
+    func updateUIView(_: LayerView, context _: Context) {}
+
+    final class LayerView: UIView {
+        private let video: CALayer
+
+        init(layer video: CALayer) {
+            self.video = video
+            super.init(frame: .zero)
+            backgroundColor = .black
+            video.removeFromSuperlayer()
+            layer.addSublayer(video)
+        }
+
+        @available(*, unavailable)
+        required init?(coder _: NSCoder) { nil }
+
+        override func layoutSubviews() {
+            super.layoutSubviews()
+            CATransaction.begin()
+            CATransaction.setDisableActions(true)
+            video.frame = bounds
+            video.contentsScale = window?.screen.scale ?? UIScreen.main.scale
+            CATransaction.commit()
+        }
+    }
+}
+
+/// Lock to landscape, or hand rotation back to the device.
+@MainActor
+enum OrientationLock {
+    private(set) static var landscape = false
+
+    /// What the app delegate answers for every window.
+    static var mask: UIInterfaceOrientationMask { landscape ? .landscape : .all }
+
+    /// Reports which way it went.
+    static func toggle() -> Bool {
+        set(!landscape)
+        return landscape
+    }
+
+    static func set(_ locked: Bool) {
+        landscape = locked
+        guard let scene = UIApplication.shared.connectedScenes.first(where: { $0 is UIWindowScene }) as? UIWindowScene else { return }
+        scene.keyWindow?.rootViewController?.setNeedsUpdateOfSupportedInterfaceOrientations()
+        scene.requestGeometryUpdate(.iOS(interfaceOrientations: mask))
+    }
+}