feat(mac,ios,playback,store): initial macos implementation

Packages/AmphlifyKit/Sources/Playback/PlaybackSession.swift

@@ -52,8 +52,13 @@ public actor PlaybackSession {
         case let .move(item, after): move(item, after: after)
         case let .remove(id): state.upcoming.removeAll { $0.id == id }
         case .clearUpcoming: state.upcoming.removeAll()
+        case .clearHistory: state.history.removeAll()
         case let .setShuffle(isOn): setShuffle(isOn)
         case let .setRepeat(mode): state.repeatMode = mode
+        case let .setVolume(volume):
+            guard volume.isFinite else { return }
+            state.volume = min(max(volume, 0), 1)
+            await engine.setVolume(state.volume)
         }
         publish()
         await syncPrepared()
@@ -142,12 +147,14 @@ public actor PlaybackSession {
     private func resume() async {
         guard state.current != nil, state.status != .playing || state.anchor.rate == 0 else { return }
         anchor(position, playing: true)
+        publish()
         await engine.play()
     }
 
     private func pause() async {
         guard state.status == .playing else { return }
         anchor(position, playing: false)
+        publish()
         await engine.pause()
     }
 
@@ -155,6 +162,7 @@ public actor PlaybackSession {
         guard let current = state.current else { return }
         let clamped = min(max(target, 0), current.track.duration)
         anchor(clamped, playing: state.status == .playing)
+        publish()
         await engine.seek(to: clamped)
     }
 
@@ -165,10 +173,15 @@ public actor PlaybackSession {
             await engine.stop()
             return
         }
+        state.anchor = PlaybackAnchor(position: position, instant: now(), rate: 0)
+        state.status = playing ? .playing : .paused
+        publish()
         await engine.load(current, at: position)
         anchor(position, playing: playing)
         if playing {
             await engine.play()
+        } else {
+            await engine.pause()
         }
     }