feat: wire ShazamService into app and display results in alerts

Music/ContentView.swift

@@ -7,6 +7,7 @@ struct ContentView: View {
     var scanner: ScannerService
     var audio: AudioService
     var playlist: PlaylistViewModel
+    var shazam: ShazamService
     @Binding var showNewPlaylistAlert: Bool
     @State private var showRenameAlert = false
     @State private var playlistNameInput = ""
@@ -21,7 +22,9 @@ struct ContentView: View {
                     if playlist.selectedPlaylist != nil {
                         playlist.search(text)
                     }
-                }
+                },
+                isShazamListening: shazam.isListening,
+                onShazam: { shazam.isListening ? shazam.stopListening() : shazam.startListening() }
             )
 
             if scanner.isScanning {
@@ -155,6 +158,26 @@ struct ContentView: View {
                 playlistToRename = nil
             }
         }
+        .alert("Song Identified", isPresented: Binding(
+            get: { shazam.matchedTitle != nil },
+            set: { if !$0 { shazam.clearResult() } }
+        )) {
+            Button("OK") { shazam.clearResult() }
+        } message: {
+            if let title = shazam.matchedTitle {
+                Text("\(title) — \(shazam.matchedArtist ?? "Unknown Artist")")
+            }
+        }
+        .alert("Shazam Error", isPresented: Binding(
+            get: { shazam.errorMessage != nil },
+            set: { if !$0 { shazam.clearResult() } }
+        )) {
+            Button("OK") { shazam.clearResult() }
+        } message: {
+            if let error = shazam.errorMessage {
+                Text(error)
+            }
+        }
     }
 
     private func handleDrop(_ providers: [NSItemProvider]) {

Music/MusicApp.swift

@@ -7,6 +7,7 @@ struct MusicApp: App {
     @State private var playerVM: PlayerViewModel?
     @State private var scannerService: ScannerService?
     @State private var audioService = AudioService()
+    @State private var shazamService = ShazamService()
     @State private var playlistVM: PlaylistViewModel?
     @State private var showNewPlaylistAlert = false
     @State private var initError: String?
@@ -25,6 +26,7 @@ struct MusicApp: App {
                         scanner: scanner,
                         audio: audioService,
                         playlist: playlist,
+                        shazam: shazamService,
                         showNewPlaylistAlert: $showNewPlaylistAlert
                     )
                 } else if let error = initError {