Voice message: variable play back speed (#5121)

* Implement voice message variable playback speed

* Move playback speed string to Untranslated

https://github.com/element-hq/element-x-ios/pull/5121#discussion_r2822631371

* Address review feedback for voice message playback speed

- Persist voice message playback speed as an enum in AppSettings instead of storing an index.
- Update playback speed cycling to derive from enum allCases and safely fall back to `.default` if the stored value cannot be resolved.
- Apply runtime speed updates in AudioPlayer only when the player is in the `.playing` state.
- Keep MediaPlayerProviderTests formatting/indentation style intact while retaining mock playback speed setup.
- Regenerate preview snapshots for:
  - PlaybackSpeedButton
  - VoiceMessageRoomPlaybackView
  - VoiceMessageRoomTimelineView

* Move VoiceMessagePlaybackSpeed outside AppSettings, remove speedRatio

* Stabilize PlaybackSpeedButton width

* Sync voice-message speed label

- Add voiceMessagePlaybackSpeed to TimelineViewState and bind it from appSettings.$voiceMessagePlaybackSpeed.
- Pass that timeline-level speed into VoiceMessageRoomPlaybackView and use it for PlaybackSpeedButton, so labels update consistently across items.
- Use @EnvironmentObject in VoiceMessageRoomTimelineContent so the view re-renders when timeline context state changes.
- In WaveformInteractionModifier, add .allowsHitTesting(showCursor) to the cursor interaction view so hidden pre-playback cursor hit area does not steal taps from the speed button.

UnitTests/Sources/AudioPlayerStateTests.swift

@@ -31,6 +31,7 @@ struct AudioPlayerStateTests {
         audioPlayerMock.state = .stopped
         audioPlayerMock.currentTime = 0.0
         audioPlayerMock.duration = 0.0
+        audioPlayerMock.playbackSpeed = 1.0
         audioPlayerMock.seekToClosure = { [audioPlayerSeekCallsSubject] progress in
             audioPlayerSeekCallsSubject?.send(progress)
         }
@@ -274,6 +275,31 @@ struct AudioPlayerStateTests {
         #expect(!audioPlayerState.showProgressIndicator)
     }
     
+    func testSetPlaybackSpeed() {
+        audioPlayerState.attachAudioPlayer(audioPlayerMock)
+
+        XCTAssertEqual(audioPlayerState.playbackSpeed, 1.0)
+
+        audioPlayerState.setPlaybackSpeed(1.5)
+        XCTAssertEqual(audioPlayerState.playbackSpeed, 1.5)
+        XCTAssertEqual(audioPlayerMock.setPlaybackSpeedReceivedSpeed, 1.5)
+
+        audioPlayerState.setPlaybackSpeed(2.0)
+        XCTAssertEqual(audioPlayerState.playbackSpeed, 2.0)
+        XCTAssertEqual(audioPlayerMock.setPlaybackSpeedReceivedSpeed, 2.0)
+
+        audioPlayerState.setPlaybackSpeed(0.5)
+        XCTAssertEqual(audioPlayerState.playbackSpeed, 0.5)
+        XCTAssertEqual(audioPlayerMock.setPlaybackSpeedReceivedSpeed, 0.5)
+    }
+
+    func testSetPlaybackSpeedWithoutPlayer() {
+        XCTAssertEqual(audioPlayerState.playbackSpeed, 1.0)
+
+        audioPlayerState.setPlaybackSpeed(2.0)
+        XCTAssertEqual(audioPlayerState.playbackSpeed, 2.0)
+    }
+
     @Test
     func audioPlayerActionsDidFailed() async throws {
         audioPlayerState.attachAudioPlayer(audioPlayerMock)

UnitTests/Sources/MediaPlayerProviderTests.swift

@@ -42,6 +42,7 @@ struct MediaPlayerProviderTests {
     func detachAllStates() {
         let audioPlayer = AudioPlayerMock()
         audioPlayer.actions = PassthroughSubject<AudioPlayerAction, Never>().eraseToAnyPublisher()
+        audioPlayer.playbackSpeed = 1.0
         
         let audioPlayerStates = Array(repeating: AudioPlayerState(id: .timelineItemIdentifier(.randomEvent), title: "", duration: 0), count: 10)
         for audioPlayerState in audioPlayerStates {
@@ -62,6 +63,7 @@ struct MediaPlayerProviderTests {
     func detachAllStatesWithException() {
         let audioPlayer = AudioPlayerMock()
         audioPlayer.actions = PassthroughSubject<AudioPlayerAction, Never>().eraseToAnyPublisher()
+        audioPlayer.playbackSpeed = 1.0
         
         let audioPlayerStates = Array(repeating: AudioPlayerState(id: .timelineItemIdentifier(.randomEvent), title: "", duration: 0), count: 10)
         for audioPlayerState in audioPlayerStates {

UnitTests/Sources/VoiceMessageRecorderTests.swift

@@ -42,6 +42,7 @@ class VoiceMessageRecorderTests: XCTestCase {
         audioPlayer = AudioPlayerMock()
         audioPlayer.actions = audioPlayerActions
         audioPlayer.state = .stopped
+        audioPlayer.playbackSpeed = 1.0
         
         mediaPlayerProvider = MediaPlayerProviderMock()
         mediaPlayerProvider.player = audioPlayer