Add passkey count and name length limits

src/ProjectTemplates/Web.ProjectTemplates/content/BlazorWeb-CSharp/BlazorWebCSharp.1/Components/Account/Pages/Manage/Passkeys.razor

@@ -48,10 +48,15 @@ else
 
 <form @formname="add-passkey" @onsubmit="AddPasskey" method="post">
     <AntiforgeryToken />
-    <PasskeySubmit Operation="PasskeyOperation.Create" Name="Input" class="btn btn-primary">Add a new passkey</PasskeySubmit>
+    @if (currentPasskeys is not { Count: >= MaxPasskeyCount })
+    {
+        <PasskeySubmit Operation="PasskeyOperation.Create" Name="Input" class="btn btn-primary">Add a new passkey</PasskeySubmit>
+    }
 </form>
 
 @code {
+    private const int MaxPasskeyCount = 100;
+
     private ApplicationUser? user;
     private IList<UserPasskeyInfo>? currentPasskeys;
 
@@ -100,6 +105,12 @@ else
             return;
         }
 
+        if (currentPasskeys!.Count >= MaxPasskeyCount)
+        {
+            RedirectManager.RedirectToCurrentPageWithStatus($"Error: You have reached the maximum number of allowed passkeys.", HttpContext);
+            return;
+        }
+
         var attestationResult = await SignInManager.PerformPasskeyAttestationAsync(Input.CredentialJson);
         if (!attestationResult.Succeeded)
         {

src/ProjectTemplates/Web.ProjectTemplates/content/BlazorWeb-CSharp/BlazorWebCSharp.1/Components/Account/Pages/Manage/RenamePasskey.razor

@@ -89,6 +89,7 @@
     private sealed class InputModel
     {
         [Required]
+        [StringLength(200, ErrorMessage = "Passkey names must be no longer than {1} characters.")]
         public string Name { get; set; } = "";
     }
 }