feat: add Avalonia Zafiro development, layout, and viewmodel skills

skills/avalonia-viewmodels-zafiro/wizards.md

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+# Wizards & Flows
+
+Complex multi-step processes are handled using the `SlimWizard` pattern. This provides a declarative way to define steps, navigation logic, and final results.
+
+## Defining a Wizard
+
+Use `WizardBuilder` to define the steps. Each step corresponds to a ViewModel.
+
+```csharp
+SlimWizard<string> wizard = WizardBuilder
+    .StartWith(() => new Step1ViewModel(data))
+        .NextUnit()
+        .WhenValid()
+    .Then(prevResult => new Step2ViewModel(prevResult))
+        .NextCommand(vm => vm.CustomNextCommand)
+    .Then(result => new SuccessViewModel("Done!"))
+        .Next((_, s) => s, "Finish")
+    .WithCompletionFinalStep();
+```
+
+### Navigation Rules
+
+- **NextUnit()**: Advances when a simple signal is emitted.
+- **NextCommand()**: Advances when a specific command in the ViewModel execution successfully.
+- **WhenValid()**: Wait until the current ViewModel's validation passes before allowing navigation.
+- **Always()**: Navigation is always allowed.
+
+## Navigation Integration
+
+The wizard is navigated using an `INavigator`:
+
+```csharp
+public async Task CreateSomething()
+{
+    var wizard = BuildWizard();
+    var result = await wizard.Navigate(navigator);
+    // Handle result
+}
+```
+
+## Step Configuration
+
+- **WithCompletionFinalStep()**: Marks the wizard as finished when the last step completes.
+- **WithCommitFinalStep()**: Typically used for wizards that perform a final "Save" or "Deploy" action.
+
+> [!NOTE]
+> The `SlimWizard` handles the "Back" command automatically, providing a consistent user experience across different flows.