refactor(apple): make InvitationError typed and localize NFC prompts

Replace the free-form InvitationError.message(String) case with semantic
cases mapped to L10n keys at the UI boundary (Error.uiText), so user-facing
error text is localized instead of substring-matched from English blobs.
.raw(String) remains only for genuinely dynamic system/core messages.

Localize the CoreNFC alertMessage prompts via existing L10n keys, and add
SwiftLint rules (raw_alert_message, raw_invitation_error) to catch raw
alert strings and literal .raw("…") errors going forward.

apple/.swiftlint.yml

@@ -32,3 +32,18 @@ custom_rules:
     regex: '\b(Text|Label|Button|Toggle|Link|NavigationLink|Section|Picker|Stepper|TextField|SecureField|DisclosureGroup|Menu|GroupBox)\("[^"]'
     message: "Pass a typed L10n.* accessor (or Text(verbatim:)), not a raw string literal."
     severity: warning
+  raw_alert_message:
+    name: "Raw NFC/alert message"
+    # User-facing UIKit/CoreNFC prompts (e.g. NFCReaderSession.alertMessage) must
+    # be localized, not hardcoded English.
+    regex: '\balertMessage\s*=\s*"'
+    message: "Assign a localized value (String(localized: L10n.*)), not a raw string literal."
+    severity: warning
+  raw_invitation_error:
+    name: "Raw InvitationError literal"
+    # InvitationError.raw is the escape hatch for genuinely dynamic system/core
+    # messages; a string literal here is a loose user-facing string that belongs
+    # in a typed InvitationError case mapped to L10n in UserFacingError.swift.
+    regex: 'InvitationError\.raw\("'
+    message: "Add a typed InvitationError case + L10n mapping instead of a literal .raw(\"…\")."
+    severity: warning

apple/Tests/UiFeedbackTests.swift

@@ -21,13 +21,13 @@ final class UiMessageControllerTests: XCTestCase {
 
 	func testErrorSuppressesUserCancellation() {
 		let c = UiMessageController()
-		c.error(InvitationError.message("QR scanning was cancelled"))
+		c.error(InvitationError.cancelled)
 		XCTAssertNil(c.current) // cancellations are swallowed
 	}
 
 	func testErrorShowsNonCancellation() {
 		let c = UiMessageController()
-		c.error(InvitationError.message("The transfer was refused"))
+		c.error(InvitationError.raw("The transfer was refused"))
 		XCTAssertEqual(c.current?.tone, .error)
 	}
 }
@@ -36,20 +36,23 @@ final class UiMessageControllerTests: XCTestCase {
 final class UserFacingErrorTests: XCTestCase {
 
 	func testIsUserCancellation() {
-		XCTAssertTrue(InvitationError.message("NFC reading was cancelled").isUserCancellation)
+		XCTAssertTrue(InvitationError.cancelled.isUserCancellation)
-		XCTAssertTrue(InvitationError.message("User canceled the picker").isUserCancellation)
+		XCTAssertTrue(InvitationError.raw("User canceled the picker").isUserCancellation)
-		XCTAssertFalse(InvitationError.message("A database error occurred").isUserCancellation)
+		XCTAssertFalse(InvitationError.raw("A database error occurred").isUserCancellation)
 	}
 
 	func testToUiTextMapsKnownReasons() {
-		XCTAssertEqual(InvitationError.message("The transfer was refused").toUiText(), .resource(L10n.Error.permission))
+		// Typed cases map directly at the UI boundary.
-		XCTAssertEqual(InvitationError.message("invalid ticket").toUiText(), .resource(L10n.Error.invalidTicket))
+		XCTAssertEqual(InvitationError.shareEmpty.toUiText(), .resource(L10n.Error.shareEmpty))
-		XCTAssertEqual(InvitationError.message("Select at least one file to share").toUiText(), .resource(L10n.Error.shareEmpty))
+		XCTAssertEqual(InvitationError.cameraUnavailable.toUiText(), .resource(L10n.Error.camera))
-		XCTAssertEqual(InvitationError.message("Camera access is required").toUiText(), .resource(L10n.Error.camera))
+		XCTAssertEqual(InvitationError.nfcFailed.toUiText(), .resource(L10n.Error.nfc))
+		// Dynamic `.raw` payloads still fall through the substring hints.
+		XCTAssertEqual(InvitationError.raw("The transfer was refused").toUiText(), .resource(L10n.Error.permission))
+		XCTAssertEqual(InvitationError.raw("invalid ticket").toUiText(), .resource(L10n.Error.invalidTicket))
 	}
 
 	func testToUiTextFallsBackToGeneric() {
-		XCTAssertEqual(InvitationError.message("something entirely unexpected").toUiText(), .resource(L10n.Error.generic))
+		XCTAssertEqual(InvitationError.raw("something entirely unexpected").toUiText(), .resource(L10n.Error.generic))
 	}
 
 	func testToUiTextMapsTypedTransferFailures() {

apple/VniDrop/Core/CoreRepository.swift

@@ -156,7 +156,7 @@ final class CoreRepository: ObservableObject, CoreGateway {
 			return .failure(CoreNetworkLifecycleError.transitionInProgress)
 		}
 		guard !sources.isEmpty else {
-			return .failure(InvitationError.message("Select at least one file to share"))
+			return .failure(InvitationError.shareEmpty)
 		}
 		return await runCore {
 			let result = try self.requireCore().shareFiles(
@@ -353,7 +353,7 @@ final class CoreRepository: ObservableObject, CoreGateway {
 
 	private nonisolated func requireCore() throws -> VnidropCore {
 		guard let core = self.core else {
-			throw InvitationError.message("Initialize the core first.")
+			throw InvitationError.coreNotInitialized
 		}
 		return core
 	}

apple/VniDrop/Core/ExternalInvitationController.swift

@@ -23,23 +23,42 @@ final class ExternalInvitationController: ObservableObject {
 	}
 
 	func reportOpenFailure(message: String) {
-		continuation?.yield(.failure(InvitationError.message(message)))
+		continuation?.yield(.failure(InvitationError.raw(message)))
 	}
 }
 
+/// Semantic, UI-agnostic invitation/transfer failures. Cases carry no display
+/// text: `Error.toUiText()` (UI layer) maps each case to a localized `L10n` key,
+/// so there are no free-form English strings to keep in sync or substring-match.
+/// `.raw` is the escape hatch for genuinely dynamic system/core messages (e.g. a
+/// `CoreNFC` `localizedDescription` or a picker's failure reason), never shown
+/// verbatim — it is still routed through `reasonHints`.
 enum InvitationError: LocalizedError {
 	case empty
 	case tooLarge
 	case invalidEncoding
-	case message(String)
+	case shareEmpty
+	case cancelled
+	case coreNotInitialized
+	case unsupportedOperation
+	case noWindowAvailable
+	case viewControllerUnavailable
+	case filesystemUnavailable
+	case invalidInvitationURL
+	case nfcUnavailable
+	case nfcFailed
+	case cameraUnavailable
+	case qrUnavailable
+	case bugReportingUnavailable
+	case selectionFailed
+	case deleteRecordsFailed
+	case raw(String)
 
+	/// Developer/log-facing only — never surfaced to users. Derived from the case
+	/// so there are no hand-written English blobs; `.raw` passes its payload through.
 	var errorDescription: String? {
-		switch self {
+		if case .raw(let reason) = self { return reason }
-		case .empty: return "The invitation is empty"
+		return String(describing: self)
-		case .tooLarge: return "The invitation is too large"
-		case .invalidEncoding: return "The invitation is not valid text"
-		case .message(let m): return m
-		}
 	}
 }
 

apple/VniDrop/Core/FileSystemService.swift

@@ -52,7 +52,7 @@ extension FileSystemService {
 	func canRevealReceiveFolder(_ folder: ReceiveFolder) -> Bool { false }
 
 	func revealReceiveFolder(_ folder: ReceiveFolder) async -> Result<Void, Error> {
-		.failure(InvitationError.message("Revealing the receive folder is not supported"))
+		.failure(InvitationError.unsupportedOperation)
 	}
 
 	func discardPickedFiles(_ files: [PickedShareFile]) async {}

apple/VniDrop/Features/Send/SendModel.swift

@@ -154,7 +154,7 @@ final class SendModel: ObservableObject {
 	}
 
 	func onFilePickFailed(_ reason: String) {
-		messages.error(InvitationError.message(reason.isEmpty ? "selection failed" : reason))
+		messages.error(reason.isEmpty ? InvitationError.selectionFailed : InvitationError.raw(reason))
 	}
 
 	func clearSelectedSource() {

apple/VniDrop/Features/Settings/BugReportService.swift

@@ -20,7 +20,7 @@ protocol BugReportService {
 /// Offline-safe no-op used until the diagnostics transport is configured.
 struct NoopBugReportService: BugReportService {
 	func submit(_ draft: BugReportDraft, deviceInfo: DeviceInfo?) async -> Result<Void, Error> {
-		.failure(InvitationError.message("Bug reporting is not configured"))
+		.failure(InvitationError.bugReportingUnavailable)
 	}
 	func previewLogBytes() async -> Int { 0 }
 }

apple/VniDrop/Features/Settings/SettingsModel.swift

@@ -206,7 +206,7 @@ final class SettingsModel: ObservableObject {
 	}
 
 	func onReceiveFolderPicked(_ folder: ReceiveFolder) { preferences.setReceiveFolder(folder) }
-	func onReceiveFolderPickFailed(_ reason: String) { messages.error(InvitationError.message(reason)) }
+	func onReceiveFolderPickFailed(_ reason: String) { messages.error(InvitationError.raw(reason)) }
 	func resetReceiveFolder() { preferences.resetReceiveFolder() }
 
 	/// Whether the current receive folder is the platform default (so the reset
@@ -475,7 +475,7 @@ final class SettingsModel: ObservableObject {
 				loadStorageUsage()
 				messages.show(UiMessage(text: .resource(L10n.Storage.transfersDeleted), tone: .success))
 			} else {
-				messages.error(InvitationError.message("Could not delete \(failures) transfer records"))
+				messages.error(InvitationError.deleteRecordsFailed)
 			}
 		}
 	}

apple/VniDrop/Platform/FileSystemService+iOS.swift

@@ -32,10 +32,10 @@ struct IosFileSystemService: FileSystemService {
 
 	func revealReceiveFolder(_ folder: ReceiveFolder) async -> Result<Void, Error> {
 		guard canRevealReceiveFolder(folder) else {
-			return .failure(InvitationError.message("The receive folder is not VniDrop Documents"))
+			return .failure(InvitationError.filesystemUnavailable)
 		}
 		guard let url = URL(string: "shareddocuments://\(folder.value)") else {
-			return .failure(InvitationError.message("The Files location URL is unavailable"))
+			return .failure(InvitationError.filesystemUnavailable)
 		}
 		let opened = await withCheckedContinuation { continuation in
 			DispatchQueue.main.async {
@@ -44,7 +44,7 @@ struct IosFileSystemService: FileSystemService {
 				}
 			}
 		}
-		return opened ? .success(()) : .failure(InvitationError.message("Could not open VniDrop Documents in Files"))
+		return opened ? .success(()) : .failure(InvitationError.filesystemUnavailable)
 	}
 
 	func discardPickedFiles(_ files: [PickedShareFile]) async {
@@ -62,7 +62,7 @@ struct IosFileSystemService: FileSystemService {
 		accessPolicy: ShareAccessPolicy
 	) async -> Result<Share, Error> {
 		guard !files.isEmpty else {
-			return .failure(InvitationError.message("Select at least one file to share"))
+			return .failure(InvitationError.shareEmpty)
 		}
 		let sources = files.map { $0.toIosShareSource() }
 		return await repository.shareSources(

apple/VniDrop/Platform/FileSystemService+macOS.swift

@@ -42,7 +42,7 @@ struct MacFileSystemService: FileSystemService {
 		accessPolicy: ShareAccessPolicy
 	) async -> Result<Share, Error> {
 		guard !files.isEmpty else {
-			return .failure(InvitationError.message("Select at least one file to share"))
+			return .failure(InvitationError.shareEmpty)
 		}
 		// Re-acquire security-scoped access to every picked source (from the bookmark
 		// captured at pick time) and hold it across the whole share call. The core

apple/VniDrop/Platform/ReceiveInvitationActions+iOS.swift

@@ -29,7 +29,7 @@ final class IosReceiveInvitationActions: NSObject, ReceiveInvitationActions, UID
 		picker.delegate = self
 		picker.modalPresentationStyle = .formSheet
 		guard let presenter = topPresenter() else {
-			return onResult(.failure(InvitationError.message("Could not find an iOS view controller")))
+			return onResult(.failure(InvitationError.viewControllerUnavailable))
 		}
 		presenter.present(picker, animated: true)
 	}
@@ -37,12 +37,12 @@ final class IosReceiveInvitationActions: NSObject, ReceiveInvitationActions, UID
 	func scanQrCode(onResult: @escaping (Result<String, Error>) -> Void) {
 		cancel()
 		guard let presenter = topPresenter() else {
-			return onResult(.failure(InvitationError.message("Could not find an iOS view controller")))
+			return onResult(.failure(InvitationError.viewControllerUnavailable))
 		}
 		ensureCameraAccess { [weak self] granted in
 			guard let self else { return }
 			guard granted else {
-				return onResult(.failure(InvitationError.message("Camera access is required to scan QR codes")))
+				return onResult(.failure(InvitationError.cameraUnavailable))
 			}
 			let scanner = QrScannerViewController { result in
 				self.qrController = nil
@@ -57,7 +57,7 @@ final class IosReceiveInvitationActions: NSObject, ReceiveInvitationActions, UID
 	func readNfcInvitation(onResult: @escaping (Result<String, Error>) -> Void) {
 		cancel()
 		guard NFCNDEFReaderSession.readingAvailable else {
-			return onResult(.failure(InvitationError.message("NFC reading is unavailable on this device")))
+			return onResult(.failure(InvitationError.nfcUnavailable))
 		}
 		let reader = InvitationNfcReader { [weak self] result in
 			self?.nfcReader = nil
@@ -80,7 +80,7 @@ final class IosReceiveInvitationActions: NSObject, ReceiveInvitationActions, UID
 		let result = documentResult
 		documentResult = nil
 		result?(Result {
-			guard let url = urls.first else { throw InvitationError.message("The selected invitation URL was invalid") }
+			guard let url = urls.first else { throw InvitationError.invalidInvitationURL }
 			let started = url.startAccessingSecurityScopedResource()
 			defer { if started { url.stopAccessingSecurityScopedResource() } }
 			let data = try Data(contentsOf: url)
@@ -157,19 +157,19 @@ final class QrScannerViewController: UIViewController, AVCaptureMetadataOutputOb
 	}
 
 	func cancelScan() {
-		finish(.failure(InvitationError.message("QR scanning was cancelled")))
+		finish(.failure(InvitationError.cancelled))
 	}
 
 	private func configureSession() {
 		guard let device = AVCaptureDevice.default(for: .video),
 			  let input = try? AVCaptureDeviceInput(device: device),
 			  session.canAddInput(input) else {
-			return finish(.failure(InvitationError.message("No camera is available")))
+			return finish(.failure(InvitationError.cameraUnavailable))
 		}
 		session.addInput(input)
 		let output = AVCaptureMetadataOutput()
 		guard session.canAddOutput(output) else {
-			return finish(.failure(InvitationError.message("Could not configure the QR scanner")))
+			return finish(.failure(InvitationError.cameraUnavailable))
 		}
 		session.addOutput(output)
 		output.setMetadataObjectsDelegate(self, queue: .main)
@@ -220,7 +220,7 @@ final class InvitationNfcReader: NSObject, NFCNDEFReaderSessionDelegate, @unchec
 
 	func start() {
 		let reader = NFCNDEFReaderSession(delegate: self, queue: .main, invalidateAfterFirstRead: true)
-		reader.alertMessage = "Hold your iPhone near a VniDrop invitation tag"
+		reader.alertMessage = String(localized: L10n.Receive.nfcWaiting)
 		session = reader
 		reader.begin()
 	}
@@ -233,7 +233,7 @@ final class InvitationNfcReader: NSObject, NFCNDEFReaderSessionDelegate, @unchec
 	func readerSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: Error) {
 		if finished { return }
 		let cancelled = (error as NSError).code == 200
-		finish(.failure(InvitationError.message(cancelled ? "NFC reading was cancelled" : error.localizedDescription)))
+		finish(.failure(cancelled ? InvitationError.cancelled : InvitationError.raw(error.localizedDescription)))
 	}
 
 	func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) {
@@ -242,7 +242,7 @@ final class InvitationNfcReader: NSObject, NFCNDEFReaderSessionDelegate, @unchec
 				.flatMap { $0.records }
 				.compactMap { payloadAsInvitation($0) }
 				.first
-			guard let ticket else { throw InvitationError.message("This NFC tag does not contain a VniDrop invitation") }
+			guard let ticket else { throw InvitationError.nfcFailed }
 			return ticket
 		}
 		session.invalidate()

apple/VniDrop/Platform/ReceiveInvitationActions+macOS.swift

@@ -22,7 +22,7 @@ final class MacReceiveInvitationActions: ReceiveInvitationActions {
 		}
 		panel.begin { response in
 			guard response == .OK, let url = panel.url else {
-				onResult(.failure(InvitationError.message("cancelled")))
+				onResult(.failure(InvitationError.cancelled))
 				return
 			}
 			onResult(Result {
@@ -33,11 +33,11 @@ final class MacReceiveInvitationActions: ReceiveInvitationActions {
 	}
 
 	func scanQrCode(onResult: @escaping (Result<String, Error>) -> Void) {
-		onResult(.failure(InvitationError.message("QR scanning is unavailable on macOS")))
+		onResult(.failure(InvitationError.qrUnavailable))
 	}
 
 	func readNfcInvitation(onResult: @escaping (Result<String, Error>) -> Void) {
-		onResult(.failure(InvitationError.message("NFC is unavailable on macOS")))
+		onResult(.failure(InvitationError.nfcUnavailable))
 	}
 
 	func cancel() {}

apple/VniDrop/Platform/TransferShareActions+iOS.swift

@@ -36,7 +36,7 @@ final class IosTransferShareActions: NSObject, TransferShareActions {
 	func writeInvitationToNfc(ticket: String, onResult: @escaping (Result<Void, Error>) -> Void) {
 		cancelNfcWrite()
 		guard NFCNDEFReaderSession.readingAvailable else {
-			onResult(.failure(InvitationError.message("NFC is unavailable on this device")))
+			onResult(.failure(InvitationError.nfcUnavailable))
 			return
 		}
 		let writer = InvitationNfcWriter(ticket: ticket) { [weak self] result in
@@ -55,7 +55,7 @@ final class IosTransferShareActions: NSObject, TransferShareActions {
 	@MainActor
 	private func present(_ controller: UIViewController) throws {
 		guard let presenter = topPresenter() else {
-			throw InvitationError.message("Could not find an iOS view controller")
+			throw InvitationError.viewControllerUnavailable
 		}
 		presenter.present(controller, animated: true)
 	}
@@ -76,7 +76,7 @@ final class InvitationNfcWriter: NSObject, NFCNDEFReaderSessionDelegate, @unchec
 
 	func start() {
 		let reader = NFCNDEFReaderSession(delegate: self, queue: .main, invalidateAfterFirstRead: false)
-		reader.alertMessage = "Hold your iPhone near a writable NFC tag"
+		reader.alertMessage = String(localized: L10n.Transfer.nfcWaiting)
 		session = reader
 		reader.begin()
 	}
@@ -89,14 +89,14 @@ final class InvitationNfcWriter: NSObject, NFCNDEFReaderSessionDelegate, @unchec
 	func readerSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: Error) {
 		if finished { return }
 		let cancelled = (error as NSError).code == 200 // readerSessionInvalidationErrorUserCanceled
-		finish(.failure(InvitationError.message(cancelled ? "NFC writing was cancelled" : error.localizedDescription)))
+		finish(.failure(cancelled ? InvitationError.cancelled : InvitationError.raw(error.localizedDescription)))
 	}
 
 	func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) {}
 
 	func readerSession(_ session: NFCNDEFReaderSession, didDetect tags: [NFCNDEFTag]) {
 		guard let firstTag = tags.first else {
-			return finish(.failure(InvitationError.message("No NFC tag was detected")))
+			return finish(.failure(InvitationError.nfcFailed))
 		}
 		// CoreNFC completion handlers run on the session's `.main` queue; these
 		// framework values are safe to use there.
@@ -109,18 +109,18 @@ final class InvitationNfcWriter: NSObject, NFCNDEFReaderSessionDelegate, @unchec
 				if let queryError { return self.finish(.failure(queryError)) }
 				switch status {
 				case .notSupported:
-					self.finish(.failure(InvitationError.message("This NFC tag does not support NDEF")))
+					self.finish(.failure(InvitationError.nfcFailed))
 				case .readOnly:
-					self.finish(.failure(InvitationError.message("This NFC tag is read-only")))
+					self.finish(.failure(InvitationError.nfcFailed))
 				default:
 					guard let message = self.invitationMessage() else {
-						return self.finish(.failure(InvitationError.message("Could not encode the invitation for NFC")))
+						return self.finish(.failure(InvitationError.nfcFailed))
 					}
 					tag.writeNDEF(message) { writeError in
 						if let writeError {
 							self.finish(.failure(writeError))
 						} else {
-							session.alertMessage = "Invitation written"
+							session.alertMessage = String(localized: L10n.Transfer.nfcWritten)
 							session.invalidate()
 							self.finish(.success(()))
 						}

apple/VniDrop/Platform/TransferShareActions+macOS.swift

@@ -17,7 +17,7 @@ final class MacTransferShareActions: TransferShareActions {
 		panel.allowedContentTypes = []
 		panel.begin { response in
 			guard response == .OK, let url = panel.url else {
-				onResult(.failure(InvitationError.message("cancelled")))
+				onResult(.failure(InvitationError.cancelled))
 				return
 			}
 			onResult(Result { try ticket.write(to: url, atomically: true, encoding: .utf8) })
@@ -28,7 +28,7 @@ final class MacTransferShareActions: TransferShareActions {
 		do {
 			let url = try writeTemporaryInvitation(ticket: ticket, transferName: transferName)
 			guard let view = NSApp.keyWindow?.contentView else {
-				onResult(.failure(InvitationError.message("No window available")))
+				onResult(.failure(InvitationError.noWindowAvailable))
 				return
 			}
 			let picker = NSSharingServicePicker(items: [url])
@@ -40,7 +40,7 @@ final class MacTransferShareActions: TransferShareActions {
 	}
 
 	func writeInvitationToNfc(ticket: String, onResult: @escaping (Result<Void, Error>) -> Void) {
-		onResult(.failure(InvitationError.message("NFC is unavailable on macOS")))
+		onResult(.failure(InvitationError.nfcUnavailable))
 	}
 
 	func cancelNfcWrite() {}

apple/VniDrop/UI/Feedback/UserFacingError.swift

@@ -5,6 +5,9 @@ import VnidropCore
 /// `ui/feedback/UserFacingError.kt`. Never exposes raw `reason=` blobs.
 extension Error {
 	func toUiText() -> UiText {
+		if let invitation = self as? InvitationError {
+			return invitation.uiText
+		}
 		if let vni = self as? VnidropError {
 			switch vni {
 			case .Ticket:
@@ -40,6 +43,7 @@ extension Error {
 
 	/// True when the user intentionally backed out of a flow.
 	var isUserCancellation: Bool {
+		if let invitation = self as? InvitationError, case .cancelled = invitation { return true }
 		if let vni = self as? VnidropError, case .Cancelled = vni { return true }
 		let haystack = technicalDetail.lowercased()
 		if haystack.isEmpty {
@@ -76,6 +80,39 @@ extension Error {
 	}
 }
 
+/// Maps each semantic `InvitationError` case to a localized user-facing message.
+/// This is the sole `InvitationError` → `L10n` boundary: no substring guessing,
+/// except for `.raw`, whose dynamic payload still falls through `reasonHints`.
+extension InvitationError {
+	var uiText: UiText {
+		switch self {
+		case .empty:
+			return .resource(L10n.Error.invitationEmpty)
+		case .tooLarge, .unsupportedOperation, .noWindowAvailable,
+			 .viewControllerUnavailable, .qrUnavailable, .bugReportingUnavailable, .cancelled:
+			return .resource(L10n.Error.generic)
+		case .invalidEncoding, .invalidInvitationURL:
+			return .resource(L10n.Error.invalidTicket)
+		case .shareEmpty:
+			return .resource(L10n.Error.shareEmpty)
+		case .coreNotInitialized:
+			return .resource(L10n.Error.startingUp)
+		case .filesystemUnavailable:
+			return .resource(L10n.Error.filesystem)
+		case .nfcUnavailable, .nfcFailed:
+			return .resource(L10n.Error.nfc)
+		case .cameraUnavailable:
+			return .resource(L10n.Error.camera)
+		case .selectionFailed:
+			return .resource(L10n.Error.selectionFailed)
+		case .deleteRecordsFailed:
+			return .resource(L10n.Error.repository)
+		case .raw(let reason):
+			return reasonHints(reason) ?? .resource(L10n.Error.generic)
+		}
+	}
+}
+
 /// Maps a receiver delivery/refusal reason code to a user-facing message, never
 /// surfacing the raw core code (e.g. `destination_exists`). Unknown codes fall back
 /// to the substring hints, then a generic message.