fix(apple): realign UI layer with regenerated core bindings

- map the new VnidropError cases (DeviceUnavailable, OfferTimeout,
  RelayPolicyIncompatible, ProtocolIncompatible) to existing catalog keys
- drop the stale .map(\.share) now that sharePickedFiles returns Share
- remove the duplicate .transfersChanged pattern in the signal switch
- replace the deprecated String(cString:) sysctl decode
- close the CoreGateway protocol declaration

apple/VniDrop/Core/CoreGateway.swift

@@ -47,3 +47,4 @@ protocol CoreGateway: AnyObject {
 	func receiverRequests(transferId: UInt64) async -> Result<[ReceiverRequestModel], Error>
 	func respondReceiverRequest(requestId: String, accepted: Bool, reason: String?) async -> Result<Void, Error>
 	func refresh() async -> Result<Void, Error>
+}

apple/VniDrop/Features/Notifications/TransferNotificationCoordinator.swift

@@ -111,7 +111,7 @@ final class TransferNotificationCoordinator: ObservableObject {
 				switch signal {
 				case .receiverHistoryChanged(let transferId), .transfersChanged(let transferId):
 					Task { await self.syncReceivers(transferId: transferId) }
-				case .approvalChanged, .transfersChanged:
+				case .approvalChanged:
 					break
 				}
 			}

apple/VniDrop/Features/Send/SendModel.swift

@@ -353,7 +353,7 @@ final class SendModel: ObservableObject {
 				senderName: current.senderName.trimmingCharacters(in: .whitespacesAndNewlines),
 				destination: .invitation(accessPolicy: current.accessPolicy)
 			)
-			switch result.map(\.share) {
+			switch result {
 			case .success(let share):
 				await fileSystemService.discardPickedFiles(current.selectedFiles)
 				if let thumb = current.selectedFiles.compactMap(\.thumbnailData).first {

apple/VniDrop/Platform/AppDependencies+macOS.swift

@@ -42,9 +42,10 @@ private struct MacDeviceInfoProvider: DeviceInfoProvider {
 		var size = 0
 		sysctlbyname("hw.model", nil, &size, nil, 0)
 		guard size > 0 else { return nil }
-		var model = [CChar](repeating: 0, count: size)
+		var model = [UInt8](repeating: 0, count: size)
 		sysctlbyname("hw.model", &model, &size, nil, 0)
-		return String(cString: model)
+		// sysctl reports a NUL-terminated C string; drop the terminator(s).
+		return String(decoding: model.prefix(while: { $0 != 0 }), as: UTF8.self)
 	}
 }
 #endif

apple/VniDrop/UI/Feedback/UserFacingError.swift

@@ -30,6 +30,10 @@ extension Error {
 				return .resource(L10n.Error.storageFull)
 			case .Network:
 				return .resource(L10n.Error.network)
+			case .DeviceUnavailable, .RelayPolicyIncompatible:
+				return .resource(L10n.Error.network)
+			case .OfferTimeout, .ProtocolIncompatible:
+				return .resource(L10n.Error.transfer)
 			case .Transfer(let reason):
 				return transferUiText(reason)
 			case .Repository:
@@ -88,6 +92,8 @@ extension Error {
 			switch vni {
 			case .Initialization(let r), .Ticket(let r), .Filesystem(let r), .FilesystemPermission(let r),
 				 .DestinationExists(let r), .StorageFull(let r), .Network(let r),
+				 .DeviceUnavailable(let r), .OfferTimeout(let r),
+				 .RelayPolicyIncompatible(let r), .ProtocolIncompatible(let r),
 				 .Transfer(let r), .Permission(let r), .Repository(let r), .Cancelled(let r),
 				 .InvalidInput(let r), .InvalidTransition(let r), .SecureStorageLocked(let r),
 				 .SecureStorageMissing(let r), .SecureStorageCorrupted(let r),