Updates

BudgetApp/Components/ToastContainer.razor

@@ -0,0 +1,51 @@
+@inject ToastService ToastService
+@implements IDisposable
+@rendermode InteractiveServer
+
+<div class="toast-stack">
+    @foreach (var toast in toasts)
+    {
+        <div class="toast-item @(toast.Dismissing ? "toast-dismiss" : "")">
+            <span class="toast-icon">⚠</span>
+            <span class="toast-message">@toast.Message</span>
+        </div>
+    }
+</div>
+
+@code {
+    private readonly List<ToastItem> toasts = [];
+
+    protected override void OnInitialized()
+    {
+        ToastService.OnShow += ShowToast;
+    }
+
+    private async void ShowToast(string message)
+    {
+        var toast = new ToastItem { Message = message };
+        toasts.Add(toast);
+        await InvokeAsync(StateHasChanged);
+        _ = DismissAfterDelay(toast);
+    }
+
+    private async Task DismissAfterDelay(ToastItem toast)
+    {
+        await Task.Delay(3500);
+        toast.Dismissing = true;
+        await InvokeAsync(StateHasChanged);
+        await Task.Delay(300);
+        toasts.Remove(toast);
+        await InvokeAsync(StateHasChanged);
+    }
+
+    public void Dispose()
+    {
+        ToastService.OnShow -= ShowToast;
+    }
+
+    private sealed class ToastItem
+    {
+        public string Message { get; set; } = "";
+        public bool Dismissing { get; set; }
+    }
+}