feat(app): step-by-step setup wizard instead of single-form panel

Startup now follows the blueprint §15 flow, one field per screen with
Avanti/Indietro: initial choice (open / create / restore), seed display
with write-it-down warning, seed confirmation by re-typing, mnemonic
validation on restore, optional BIP39 passphrase, and wallet file
password as the final step. Opening an encrypted file from the menu
routes to the same password step.

src/App/ViewModels/MainWindowViewModel.cs

@@ -69,11 +69,43 @@ public partial class MainWindowViewModel : ViewModelBase
     [ObservableProperty]
     private string statusMessage = "";
 
-    // ---- pannello setup ----
+    // ---- wizard di setup (§15): un passo alla volta ----
+
+    public const string StepStart = "start";
+    public const string StepOpen = "open";
+    public const string StepShowSeed = "show-seed";
+    public const string StepConfirmSeed = "confirm-seed";
+    public const string StepWords = "words";
+    public const string StepPassphrase = "passphrase";
+    public const string StepPassword = "password";
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(IsStepStart))]
+    [NotifyPropertyChangedFor(nameof(IsStepOpen))]
+    [NotifyPropertyChangedFor(nameof(IsStepShowSeed))]
+    [NotifyPropertyChangedFor(nameof(IsStepConfirmSeed))]
+    [NotifyPropertyChangedFor(nameof(IsStepWords))]
+    [NotifyPropertyChangedFor(nameof(IsStepPassphrase))]
+    [NotifyPropertyChangedFor(nameof(IsStepPassword))]
+    private string setupStep = StepStart;
+
+    public bool IsStepStart => SetupStep == StepStart;
+    public bool IsStepOpen => SetupStep == StepOpen;
+    public bool IsStepShowSeed => SetupStep == StepShowSeed;
+    public bool IsStepConfirmSeed => SetupStep == StepConfirmSeed;
+    public bool IsStepWords => SetupStep == StepWords;
+    public bool IsStepPassphrase => SetupStep == StepPassphrase;
+    public bool IsStepPassword => SetupStep == StepPassword;
+
+    /// <summary>True quando il flusso è "ripristina" (parole inserite dall'utente).</summary>
+    private bool _isRestoreFlow;
 
     [ObservableProperty]
     private string mnemonicInput = "";
 
+    [ObservableProperty]
+    private string confirmMnemonicInput = "";
+
     [ObservableProperty]
     private string passphraseInput = "";
 
@@ -180,10 +212,12 @@ public partial class MainWindowViewModel : ViewModelBase
 
     private void RefreshSetupState()
     {
+        SetupStep = StepStart;
+        MnemonicInput = ConfirmMnemonicInput = PassphraseInput = PasswordInput = "";
         WalletFileExists = WalletStore.Exists(AppPaths.DefaultWalletPath(Net));
         StatusMessage = WalletFileExists
-            ? "Trovato un wallet esistente: inserisci la password (se impostata) e apri."
-            : "Nessun wallet su questa rete: creane uno nuovo o ripristina da seed.";
+            ? "Trovato un wallet esistente su questa rete: aprilo, oppure creane un altro."
+            : "Benvenuto: crea un nuovo wallet o ripristina da seed.";
         RefreshServers();
     }
 
@@ -209,13 +243,97 @@ public partial class MainWindowViewModel : ViewModelBase
             ServerInput = $"{server.Host}:{server.PortFor(value)}";
     }
 
-    // ---------- comandi setup ----------
+    // ---------- comandi del wizard (§15): un passo alla volta ----------
 
     [RelayCommand]
-    private void GenerateMnemonic()
+    private void WizardStartOpen()
     {
+        PasswordInput = "";
+        SetupStep = StepOpen;
+        StatusMessage = "Inserisci la password del file (lascia vuoto se non impostata).";
+    }
+
+    [RelayCommand]
+    private void WizardStartNew()
+    {
+        _isRestoreFlow = false;
         MnemonicInput = Bip39.Generate(MnemonicLength.Twelve).ToString();
-        StatusMessage = "Nuova mnemonica generata: SCRIVILA SU CARTA prima di continuare.";
+        SetupStep = StepShowSeed;
+        StatusMessage = "Scrivi le 12 parole SU CARTA, nell'ordine. Sono l'unico backup del wallet.";
+    }
+
+    [RelayCommand]
+    private void WizardStartRestore()
+    {
+        _isRestoreFlow = true;
+        MnemonicInput = "";
+        SetupStep = StepWords;
+        StatusMessage = "Inserisci la mnemonica BIP39 (12 o 24 parole separate da spazi).";
+    }
+
+    [RelayCommand]
+    private void WizardNextFromShowSeed()
+    {
+        ConfirmMnemonicInput = "";
+        SetupStep = StepConfirmSeed;
+        StatusMessage = "Reinserisci le 12 parole per confermare di averle scritte.";
+    }
+
+    [RelayCommand]
+    private void WizardNextFromConfirmSeed()
+    {
+        var normalized = string.Join(' ',
+            ConfirmMnemonicInput.Split(' ', StringSplitOptions.RemoveEmptyEntries));
+        if (!string.Equals(normalized, MnemonicInput, StringComparison.OrdinalIgnoreCase))
+        {
+            StatusMessage = "Le parole non corrispondono: ricontrolla quello che hai scritto su carta.";
+            return;
+        }
+        GoToPassphraseStep();
+    }
+
+    [RelayCommand]
+    private void WizardNextFromWords()
+    {
+        if (!Bip39.TryParse(MnemonicInput, out _))
+        {
+            StatusMessage = "Mnemonica non valida (parole o checksum errati): ricontrolla.";
+            return;
+        }
+        GoToPassphraseStep();
+    }
+
+    private void GoToPassphraseStep()
+    {
+        PassphraseInput = "";
+        SetupStep = StepPassphrase;
+        StatusMessage = "Passphrase BIP39 opzionale: cambia completamente il wallet. " +
+            "Se la usi, annotala A PARTE dal seed; se la perdi i fondi sono irrecuperabili. " +
+            "Lascia vuoto per non usarla.";
+    }
+
+    [RelayCommand]
+    private void WizardNextFromPassphrase()
+    {
+        PasswordInput = "";
+        SetupStep = StepPassword;
+        StatusMessage = "Password di cifratura del file wallet su disco (consigliata). " +
+            "Non sostituisce il seed: serve solo a proteggere il file.";
+    }
+
+    [RelayCommand]
+    private void WizardBack()
+    {
+        SetupStep = SetupStep switch
+        {
+            StepOpen or StepShowSeed or StepWords => StepStart,
+            StepConfirmSeed => StepShowSeed,
+            StepPassphrase => _isRestoreFlow ? StepWords : StepConfirmSeed,
+            StepPassword => StepPassphrase,
+            _ => StepStart,
+        };
+        if (SetupStep == StepStart)
+            RefreshSetupState();
     }
 
     [RelayCommand]
@@ -275,11 +393,13 @@ public partial class MainWindowViewModel : ViewModelBase
         }
         catch (WrongPasswordException)
         {
-            // Cifrato: si chiede la password nel pannello di apertura.
+            // Cifrato: si chiede la password nel passo di apertura del wizard.
             if (IsWalletOpen)
                 CloseWallet();
             _pendingOpenPath = path;
             WalletFileExists = true;
+            PasswordInput = "";
+            SetupStep = StepOpen;
             StatusMessage = $"Il wallet \"{Path.GetFileName(path)}\" è cifrato: inserisci la password e premi Apri.";
         }
         catch (Exception ex)
@@ -306,7 +426,8 @@ public partial class MainWindowViewModel : ViewModelBase
         _account = account;
         _walletPath = path;
         _password = password;
-        MnemonicInput = PassphraseInput = PasswordInput = "";
+        MnemonicInput = ConfirmMnemonicInput = PassphraseInput = PasswordInput = "";
+        SetupStep = StepStart;
 
         NetworkInfo = $"{doc.Network} · {doc.ScriptKind} · m/{doc.AccountPath}"
             + (doc.IsWatchOnly ? " · watch-only" : "");

src/App/Views/MainWindow.axaml

@@ -31,44 +31,107 @@
             </MenuItem>
         </Menu>
 
-        <!-- ============ PANNELLO SETUP: crea / ripristina / apri ============ -->
+        <!-- ============ WIZARD DI SETUP (§15): un passo alla volta ============ -->
         <ScrollViewer Grid.Row="1" IsVisible="{Binding IsSetupVisible}">
-            <StackPanel MaxWidth="560" Margin="24" Spacing="14">
-                <TextBlock Text="Palladium Wallet" FontSize="28" FontWeight="Bold"/>
+            <StackPanel MaxWidth="560" Margin="24,40" Spacing="18"
+                        HorizontalAlignment="Center">
+                <TextBlock Text="Palladium Wallet" FontSize="28" FontWeight="Bold"
+                           HorizontalAlignment="Center"/>
 
-                <StackPanel Orientation="Horizontal" Spacing="10">
+                <!-- Passo 1: scelta iniziale -->
+                <StackPanel IsVisible="{Binding IsStepStart}" Spacing="12">
+                    <StackPanel Orientation="Horizontal" Spacing="10" HorizontalAlignment="Center">
                         <TextBlock Text="Rete:" VerticalAlignment="Center"/>
                         <ComboBox ItemsSource="{Binding Networks}"
-                              SelectedItem="{Binding SelectedNetwork}"
-                              MinWidth="140"/>
+                                  SelectedItem="{Binding SelectedNetwork}" MinWidth="140"/>
+                    </StackPanel>
+                    <Button Content="Apri il wallet esistente" FontSize="16"
+                            HorizontalAlignment="Stretch" HorizontalContentAlignment="Center"
+                            IsVisible="{Binding WalletFileExists}"
+                            Command="{Binding WizardStartOpenCommand}"/>
+                    <Button Content="Crea un nuovo wallet" FontSize="16"
+                            HorizontalAlignment="Stretch" HorizontalContentAlignment="Center"
+                            Command="{Binding WizardStartNewCommand}"/>
+                    <Button Content="Ripristina da seed" FontSize="16"
+                            HorizontalAlignment="Stretch" HorizontalContentAlignment="Center"
+                            Command="{Binding WizardStartRestoreCommand}"/>
                 </StackPanel>
 
-                <!-- Apri wallet esistente -->
-                <Border IsVisible="{Binding WalletFileExists}"
-                        BorderBrush="{DynamicResource SystemAccentColor}" BorderThickness="1"
-                        CornerRadius="6" Padding="14">
-                    <StackPanel Spacing="8">
-                        <TextBlock Text="Apri il wallet esistente" FontWeight="Bold"/>
+                <!-- Passo: password del wallet esistente -->
+                <StackPanel IsVisible="{Binding IsStepOpen}" Spacing="12">
+                    <TextBlock Text="Apri il wallet" FontSize="18" FontWeight="Bold"/>
                     <TextBox PlaceholderText="Password del file (vuoto se non impostata)"
                              PasswordChar="●" Text="{Binding PasswordInput}"/>
-                        <Button Content="Apri wallet" Command="{Binding OpenExistingCommand}"/>
+                    <StackPanel Orientation="Horizontal" Spacing="10">
+                        <Button Content="Indietro" Command="{Binding WizardBackCommand}"/>
+                        <Button Content="Apri" Classes="accent" Command="{Binding OpenExistingCommand}"/>
+                    </StackPanel>
                 </StackPanel>
-                </Border>
 
-                <!-- Crea / ripristina -->
-                <Border BorderBrush="Gray" BorderThickness="1" CornerRadius="6" Padding="14">
-                    <StackPanel Spacing="8">
-                        <TextBlock Text="Crea nuovo o ripristina da seed" FontWeight="Bold"/>
-                        <TextBox PlaceholderText="Mnemonica BIP39 (12 o 24 parole)"
-                                 AcceptsReturn="False" Text="{Binding MnemonicInput}"/>
-                        <Button Content="Genera nuova mnemonica" Command="{Binding GenerateMnemonicCommand}"/>
-                        <TextBox PlaceholderText="Passphrase BIP39 opzionale (cambia il wallet! annotala a parte)"
-                                 Text="{Binding PassphraseInput}"/>
-                        <TextBox PlaceholderText="Password di cifratura del file wallet (consigliata)"
-                                 PasswordChar="●" Text="{Binding PasswordInput}"/>
-                        <Button Content="Crea / ripristina wallet" Command="{Binding CreateOrRestoreCommand}"/>
-                    </StackPanel>
+                <!-- Passo: mostra il nuovo seed -->
+                <StackPanel IsVisible="{Binding IsStepShowSeed}" Spacing="12">
+                    <TextBlock Text="Il tuo seed (12 parole)" FontSize="18" FontWeight="Bold"/>
+                    <Border BorderBrush="{DynamicResource SystemAccentColor}" BorderThickness="1"
+                            CornerRadius="6" Padding="14">
+                        <SelectableTextBlock Text="{Binding MnemonicInput}"
+                                             FontFamily="monospace" FontSize="16" TextWrapping="Wrap"/>
                     </Border>
+                    <TextBlock Foreground="Orange" TextWrapping="Wrap"
+                               Text="Scrivi le parole su carta, nell'ordine. Chi le possiede controlla i fondi; se le perdi, i fondi sono irrecuperabili."/>
+                    <StackPanel Orientation="Horizontal" Spacing="10">
+                        <Button Content="Indietro" Command="{Binding WizardBackCommand}"/>
+                        <Button Content="Le ho scritte — Avanti" Classes="accent"
+                                Command="{Binding WizardNextFromShowSeedCommand}"/>
+                    </StackPanel>
+                </StackPanel>
+
+                <!-- Passo: conferma del seed -->
+                <StackPanel IsVisible="{Binding IsStepConfirmSeed}" Spacing="12">
+                    <TextBlock Text="Conferma il seed" FontSize="18" FontWeight="Bold"/>
+                    <TextBox PlaceholderText="Reinserisci le 12 parole separate da spazi"
+                             AcceptsReturn="False" Text="{Binding ConfirmMnemonicInput}"/>
+                    <StackPanel Orientation="Horizontal" Spacing="10">
+                        <Button Content="Indietro" Command="{Binding WizardBackCommand}"/>
+                        <Button Content="Avanti" Classes="accent"
+                                Command="{Binding WizardNextFromConfirmSeedCommand}"/>
+                    </StackPanel>
+                </StackPanel>
+
+                <!-- Passo: inserimento seed (ripristino) -->
+                <StackPanel IsVisible="{Binding IsStepWords}" Spacing="12">
+                    <TextBlock Text="Ripristina da seed" FontSize="18" FontWeight="Bold"/>
+                    <TextBox PlaceholderText="Mnemonica BIP39 (12 o 24 parole separate da spazi)"
+                             AcceptsReturn="False" Text="{Binding MnemonicInput}"/>
+                    <StackPanel Orientation="Horizontal" Spacing="10">
+                        <Button Content="Indietro" Command="{Binding WizardBackCommand}"/>
+                        <Button Content="Avanti" Classes="accent"
+                                Command="{Binding WizardNextFromWordsCommand}"/>
+                    </StackPanel>
+                </StackPanel>
+
+                <!-- Passo: passphrase opzionale -->
+                <StackPanel IsVisible="{Binding IsStepPassphrase}" Spacing="12">
+                    <TextBlock Text="Passphrase opzionale" FontSize="18" FontWeight="Bold"/>
+                    <TextBox PlaceholderText="Lascia vuoto per non usarla"
+                             Text="{Binding PassphraseInput}"/>
+                    <StackPanel Orientation="Horizontal" Spacing="10">
+                        <Button Content="Indietro" Command="{Binding WizardBackCommand}"/>
+                        <Button Content="Avanti" Classes="accent"
+                                Command="{Binding WizardNextFromPassphraseCommand}"/>
+                    </StackPanel>
+                </StackPanel>
+
+                <!-- Passo finale: password del file -->
+                <StackPanel IsVisible="{Binding IsStepPassword}" Spacing="12">
+                    <TextBlock Text="Password del file wallet" FontSize="18" FontWeight="Bold"/>
+                    <TextBox PlaceholderText="Consigliata (vuoto = file in chiaro su disco)"
+                             PasswordChar="●" Text="{Binding PasswordInput}"/>
+                    <StackPanel Orientation="Horizontal" Spacing="10">
+                        <Button Content="Indietro" Command="{Binding WizardBackCommand}"/>
+                        <Button Content="Crea il wallet" Classes="accent"
+                                Command="{Binding CreateOrRestoreCommand}"/>
+                    </StackPanel>
+                </StackPanel>
             </StackPanel>
         </ScrollViewer>