feat(offline): bundle local assets and add safe UI error recovery (U16)

tests/Duempelkas.Tests/ErrorRecoveryTests.cs

@@ -0,0 +1,28 @@
+using Bunit;
+using Duempelkas.App.Components;
+using Duempelkas.App.Services;
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.Rendering;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit;
+
+namespace Duempelkas.Tests;
+
+public class ErrorRecoveryTests
+{
+    [Fact]
+    public void UnexpectedError_OffersRecoveryWithoutLeakingBookingData()
+    {
+        using var context = new BunitContext();
+        context.Services.AddSingleton<ToastService>();
+        var boundary = context.Render<AppErrorBoundary>(p => p.AddChildContent<Throws>());
+        boundary.WaitForAssertion(() => Assert.Contains("nicht bestätigt", boundary.Markup));
+        Assert.Contains("Zur Kontenübersicht", boundary.Markup);
+        Assert.Contains("InvalidOperationException", boundary.Markup);
+        Assert.DoesNotContain("SECRET_BOOKING_DATA", boundary.Markup);
+    }
+    private sealed class Throws : ComponentBase
+    {
+        protected override void BuildRenderTree(RenderTreeBuilder builder) => throw new InvalidOperationException("SECRET_BOOKING_DATA");
+    }
+}