feat: update validation methods to use ValidateAsync for improved performance and consistency

Author: aalmada

.github/skills/blazor-mudblazor/SKILL.md

@@ -57,7 +57,10 @@ Every admin management page follows this shell (details in `../csharp-blazor/SKI
 
 ## Common Gotchas
 
+- `MudForm` validation: call `await _form.ValidateAsync()` (not `Validate()` — removed in v9).
+- `IDialogService` confirmation: use `await DialogService.ShowMessageBoxAsync(...)` (renamed from `ShowMessageBox` in v9).
 - `MudTable<T>` search: use a **property** with a setter that calls `_table.ReloadServerData()`, not field + `@bind-Value`. See `references/tables-data.md`.
+- `MudTabs.PanelClass` was removed in v9 — set `PanelClass` on each `<MudTabPanel>` individually instead.
 - `MudAutocomplete<T>` needs both `SearchFunc` and `ToStringFunc` for object types.
 - `ISnackbar.Add(message, Severity.X)` — inject `ISnackbar Snackbar` via `@inject`.
 - `MudDialog` requires `MudDialogProvider` to be registered in `Routes.razor`.

.github/skills/blazor-mudblazor/references/dialogs-feedback.md

@@ -91,7 +91,7 @@ Dialog components **do not** declare `@rendermode` — they inherit it from thei
 
     private async Task Submit()
     {
-        await _form.Validate();
+        await _form.ValidateAsync();
         if (!_success) return;
 
         var result = await WidgetsClient.CreateWidgetAsync(_model);
@@ -127,7 +127,7 @@ For destructive actions, use `IDialogService` with a simple confirm dialog:
 ```csharp
 private async Task DeleteWidget(Guid id, string etag)
 {
-    var confirm = await DialogService.ShowMessageBox(
+    var confirm = await DialogService.ShowMessageBoxAsync(
         "Delete Widget",
         "Are you sure you want to delete this widget? This cannot be undone.",
         yesText: "Delete", cancelText: "Cancel");

.github/skills/blazor-mudblazor/references/forms-inputs.md

@@ -36,7 +36,7 @@ BookStore uses `MudForm` for validation, **not** `EditContext` or `DataAnnotatio
 
     private async Task Submit()
     {
-        await _form.Validate();
+        await _form.ValidateAsync();
         if (!_success) return;
 
         var result = await WidgetsClient.CreateWidgetAsync(_model);

Directory.Packages.props

@@ -37,7 +37,7 @@
     <PackageVersion Include="Microsoft.JSInterop" Version="10.0.2" />
     <PackageVersion Include="MimeKit" Version="4.15.1" />
     <PackageVersion Include="Microsoft.Playwright" Version="1.58.0" />
-    <PackageVersion Include="MudBlazor" Version="8.15.0" />
+    <PackageVersion Include="MudBlazor" Version="9.3.0" />
     <PackageVersion Include="Npgsql" Version="10.0.1" />
     <PackageVersion Include="NSubstitute" Version="5.3.0" />
     <PackageVersion Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.0" />

src/BookStore.Web/Components/Pages/Admin/AddBookDialog.razor

@@ -357,7 +357,7 @@
 
     private async Task Submit()
     {
-        await _form.Validate();
+        await _form.ValidateAsync();
         if (!_form.IsValid) return;
 
         try

src/BookStore.Web/Components/Pages/Admin/AuthorManagement.razor

@@ -151,7 +151,7 @@
 
     private async Task DeleteAuthor(AdminAuthorDto author)
     {
-        var result = await DialogService.ShowMessageBox(
+        var result = await DialogService.ShowMessageBoxAsync(
             "Delete Author",
             $"Are you sure you want to delete author {author.Name}?",
             yesText: "Delete", cancelText: "Cancel");

src/BookStore.Web/Components/Pages/Admin/CategoryManagement.razor

@@ -150,7 +150,7 @@
 
     private async Task DeleteCategory(AdminCategoryDto category)
     {
-        var result = await DialogService.ShowMessageBox(
+        var result = await DialogService.ShowMessageBoxAsync(
             "Delete Category",
             $"Are you sure you want to delete category {category.Name}?",
             yesText: "Delete", cancelText: "Cancel");

src/BookStore.Web/Components/Pages/Admin/CreateAuthorDialog.razor

@@ -115,7 +115,7 @@
 
     private async Task Submit()
     {
-        await _form.Validate();
+        await _form.ValidateAsync();
         if (!_form.IsValid || !_translations.ContainsKey("en")) return;
 
         try

src/BookStore.Web/Components/Pages/Admin/CreateCategoryDialog.razor

@@ -99,7 +99,7 @@
 
     private async Task Submit()
     {
-        await _form.Validate();
+        await _form.ValidateAsync();
         if (!_translations.ContainsKey("en")) return;
 
         try

src/BookStore.Web/Components/Pages/Admin/CreatePublisherDialog.razor

@@ -34,7 +34,7 @@
 
     private async Task Submit()
     {
-        await _form.Validate();
+        await _form.ValidateAsync();
         if (!_form.IsValid) return;
 
         try