Restore clean role-change success message

Drop the temporary "saved: …" diagnostic wording now that the production
interactivity bug is fixed. Keeps the robust @onchange handler and the
previous-role return value used in the audit entry.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Components/Pages/Admin/UserManagement.razor

@@ -195,24 +195,15 @@ else
 
     private async Task OnRoleChange(AppUser user, ChangeEventArgs e)
     {
-        // Surface every branch on-screen so a failed save is never silent. The "saved" value is
-        // re-read from the store, so it proves whether the write actually landed on disk.
-        var raw = e.Value?.ToString();
-        if (!Enum.TryParse<UserRole>(raw, out var newRole))
-        {
-            _message = string.Format(T["usermgmt.msg.error"], $"unrecognized role value '{raw}'");
-            _isError = true;
-            return;
-        }
+        if (!Enum.TryParse<UserRole>(e.Value?.ToString(), out var newRole)) return;
         try
         {
             var oldRole = await UserService.UpdateRoleAsync(user.Id, newRole);
             user.Role   = newRole;
-            var saved   = (await UserService.GetByEmailAsync(user.Email))?.Role;
             await Audit.LogAsync("RoleChanged", "", Array.Empty<string>(),
                 $"Changed role for {user.Email} ({user.DisplayName}) from {oldRole} to {newRole}.");
-            _message  = $"{string.Format(T["usermgmt.msg.roleupdated"], user.DisplayName)} ({oldRole} → {newRole}, saved: {saved})";
-            _isError  = saved != newRole;
+            _message  = string.Format(T["usermgmt.msg.roleupdated"], user.DisplayName);
+            _isError  = false;
         }
         catch (Exception ex)
         {