feat(ui): constrain decimal input and add stacked timed toasts with uniform actions

tests/Duempelkas.Tests/ToastTests.cs

@@ -0,0 +1,43 @@
+using Bunit;
+using Duempelkas.App.Components;
+using Duempelkas.App.Services;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit;
+
+namespace Duempelkas.Tests;
+
+public class ToastTests
+{
+    [Fact]
+    public async Task ToastsStack_ExpireIndependently_AndPauseDuringInteraction()
+    {
+        using var context = new BunitContext();
+        context.Services.AddSingleton<ToastService>();
+        var host = context.Render<ToastHost>();
+        var service = context.Services.GetRequiredService<ToastService>();
+        var first = service.Show("Erste Meldung", duration: TimeSpan.FromMilliseconds(100));
+        service.Pause(first);
+        service.Show("Zweite Meldung", ToastKind.Success, persistent: true);
+        host.WaitForAssertion(() => Assert.Equal(2, host.FindAll(".app-toast").Count));
+        await Task.Delay(200);
+        Assert.Equal(2, service.Messages.Count);
+        service.Resume(first);
+        host.WaitForAssertion(() => Assert.Single(host.FindAll(".app-toast")));
+        Assert.Contains("Zweite Meldung", host.Markup);
+        host.Find(".toast-close").Click();
+        Assert.Empty(service.Messages);
+    }
+
+    [Fact]
+    public void AmountControl_RejectsWholePasteWithoutRounding()
+    {
+        using var context = new BunitContext();
+        string amount = "12,50";
+        var control = context.Render<AmountInput>(p => p.Add(x => x.Value, amount).Add(x => x.ValueChanged, value => amount = value));
+        control.Find("input").Input("12,501");
+        Assert.Equal("12,50", amount);
+        Assert.Contains("nicht übernommen", control.Markup);
+        control.Find("input").Input("12.25");
+        Assert.Equal("12.25", amount);
+    }
+}