fix(apple): make the device detail screen reachable

The Settings stack has a typed path of [SettingsSection], so a
NavigationLink carrying a String could never push onto it: tapping a device
in the list did nothing. Contact detail is now a SettingsSection case, and
the path maps it to the two-level push the way the bug report screen
already does.

apple/VniDrop/Features/Settings/SettingsModel.swift

@@ -9,6 +9,9 @@ enum SettingsSection: Hashable {
 	case notifications
 	case network
 	case contacts
+	/// One device's detail. Part of this enum because the Settings stack has a
+	/// typed path: a link carrying any other value type cannot push onto it.
+	case contactDetail(endpointId: String)
 	case storage
 	case about
 	case bugReport
@@ -20,7 +23,7 @@ enum SettingsSection: Hashable {
 		case .appearance: return L10n.Appearance.title
 		case .notifications: return L10n.Notifications.title
 		case .network: return L10n.Settings.networkTitle
-		case .contacts: return L10n.Contacts.title
+		case .contacts, .contactDetail: return L10n.Contacts.title
 		case .storage: return L10n.Storage.title
 		case .about: return L10n.About.title
 		case .bugReport: return L10n.About.bugReport

apple/VniDrop/Features/Settings/SettingsScreen.swift

@@ -15,6 +15,8 @@ struct SettingsScreen: View {
 				switch model.state.selectedSection {
 				case .overview: return []
 				case .bugReport: return [.about, .bugReport]
+				case .contactDetail(let endpointId):
+					return [.contacts, .contactDetail(endpointId: endpointId)]
 				case let section: return [section]
 				}
 			},
@@ -92,7 +94,9 @@ struct SettingsScreen: View {
 	private func sectionForm(_ section: SettingsSection) -> some View {
 		// Contacts brings its own Form and push destination, so it is not wrapped
 		// in the shared section chrome.
-		if section == .contacts {
+		if case .contactDetail(let endpointId) = section {
+			ContactDetailScreen(model: contacts, endpointId: endpointId)
+		} else if section == .contacts {
 			ContactsScreen(model: contacts) {
 				model.reportNothingWaiting()
 			}
@@ -153,7 +157,7 @@ private struct SettingsSectionContent: View {
 			NetworkSettings(model: model)
 		case .storage:
 			StorageSettings(model: model)
-		case .contacts:
+		case .contacts, .contactDetail:
 			// Rendered by SettingsScreen itself, which owns the contacts model.
 			EmptyView()
 		case .about: