Fix remote player SDK types and signing prefix; test remote commands

MusicBridge/Info.plist

@@ -73,6 +73,6 @@
 		</dict>
 	</dict>
 	<key>MusicBridgeSharedKeychainGroup</key>
-	<string>$(AppIdentifierPrefix)ru.yukinoki.musicbridge.remote-control</string>
+	<string>ru.yukinoki.musicbridge.remote-control</string>
 </dict>
 </plist>

MusicBridge/SystemPlayerManager.swift

@@ -44,21 +44,29 @@ final class SystemPlayerManager: ObservableObject {
     func restore(connection: Connection?) async {
         guard #available(iOS 27.0, *), id == nil, !busy,
               let savedID = UserDefaults.standard.string(forKey: savedIDKey) else { return }
+        busy = true
+        id = savedID
+        let operation = generation
+        defer { if generation == operation { busy = false } }
         do {
             let saved = try SystemPlayerCredentials.load(savedID)
             guard let connection, saved.fingerprint == connection.fingerprint, saved.token == connection.token else {
                 try SystemPlayerCredentials.delete(savedID)
                 UserDefaults.standard.removeObject(forKey: savedIDKey)
                 for session in try await RemoteMediaSession<SystemPlayerAttributes>.sessions() where session.id == savedID { try await session.end() }
+                if generation == operation { id = nil }
                 return
             }
             if let session = try await RemoteMediaSession<SystemPlayerAttributes>.sessions().first(where: { $0.id == savedID }) {
+                guard generation == operation else { return }
                 storage = session; id = savedID; running = true
             } else {
+                guard generation == operation else { return }
                 try SystemPlayerCredentials.delete(savedID)
                 UserDefaults.standard.removeObject(forKey: savedIDKey)
+                id = nil
             }
-        } catch { self.error = BridgeError.describe(error) }
+        } catch { if generation == operation { self.error = BridgeError.describe(error); id = nil } }
     }
 
     func receive(_ state: MediaState, connection: Connection) {