Fix profile name reset to initial on error

Passepartout/App/Views/AddHostView.swift

@@ -95,10 +95,11 @@ struct AddHostView: View {
     private var processingView: some View {
         AddProfileView.ProfileNameSection(
             profileName: $viewModel.profileName,
-            initialName: url.normalizedFilename,
             errorMessage: viewModel.errorMessage
         ) {
             processProfile(replacingExisting: false)
+        }.onAppear {
+            viewModel.presetName(withURL: url)
         }
         if viewModel.requiresPassphrase {
             encryptionSection

Passepartout/App/Views/AddHostViewModel.swift

@@ -30,6 +30,8 @@ import TunnelKitWireGuard
 
 extension AddHostView {
     struct ViewModel {
+        private var isNamePreset = false
+        
         var profileName = ""
         
         private(set) var requiresPassphrase = false
@@ -41,6 +43,14 @@ extension AddHostView {
         private(set) var errorMessage: String?
         
         var isAskingOverwrite = false
+        
+        mutating func presetName(withURL url: URL) {
+            guard !isNamePreset else {
+                return
+            }
+            isNamePreset = true
+            profileName = url.normalizedFilename
+        }
 
         @MainActor
         mutating func processURL(

Passepartout/App/Views/AddProfileView.swift

@@ -34,8 +34,6 @@ enum AddProfileView {
     struct ProfileNameSection: View {
         @Binding var profileName: String
         
-        let initialName: String
-        
         let errorMessage: String?
         
         let onCommit: () -> Void
@@ -46,12 +44,6 @@ enum AddProfileView {
                 footer: themeErrorMessage(errorMessage)
             ) {
                 TextField(L10n.Global.Placeholders.profileName, text: $profileName, onCommit: onCommit)
-                    .onAppear {
-                        // XXX: this is reset on the way back, but:
-                        // host: there is no back button after processing profile
-                        // host/provider: back button is hidden after going to credentials
-                        profileName = initialName
-                    }
             }
         }
     }

Passepartout/App/Views/AddProviderView+Name.swift

@@ -56,10 +56,11 @@ extension AddProviderView {
                 List {
                     AddProfileView.ProfileNameSection(
                         profileName: $viewModel.profileName,
-                        initialName: providerMetadata.fullName,
                         errorMessage: viewModel.errorMessage
                     ) {
                         saveProfile(replacingExisting: false)
+                    }.onAppear {
+                        viewModel.presetName(withMetadata: providerMetadata)
                     }
                     let headers = profileManager.headers.sorted()
                     if !headers.isEmpty {

Passepartout/App/Views/AddProviderViewModel.swift

@@ -124,11 +124,21 @@ extension AddProviderView {
 
 extension AddProviderView.NameView {
     struct ViewModel {
+        private var isNamePreset = false
+
         var profileName = ""
         
         var isAskingOverwrite = false
         
         private(set) var errorMessage: String?
+        
+        mutating func presetName(withMetadata metadata: ProviderMetadata) {
+            guard !isNamePreset else {
+                return
+            }
+            isNamePreset = true
+            profileName = metadata.fullName
+        }
 
         @MainActor
         mutating func addProfile(