fix(centralui): marshal Audit Log LocationChanged handler through InvokeAsync

Code-review follow-ups on the same-page drill-in fix (3f1c0e5):
- Wrap HandleLocationChanged's body in InvokeAsync — LocationChanged can
  fire off the renderer's synchronization context.
- Document that a paramless /audit/log navigation intentionally preserves
  the last applied filter (drill-ins always carry query params).

src/ScadaLink.CentralUI/Components/Pages/Audit/AuditLogPage.razor.cs

@@ -66,14 +66,19 @@ public partial class AuditLogPage : IDisposable
     /// navigates to <c>/audit/log?executionId=…</c>). Reassigning
     /// <see cref="_currentFilter"/> to a fresh instance is what kicks the results
     /// grid into reloading; we also close the drawer so the operator sees the
-    /// newly filtered grid, and call <see cref="ComponentBase.StateHasChanged"/>
-    /// because this fires outside the normal render lifecycle.
+    /// newly filtered grid. The body is marshalled through
+    /// <see cref="ComponentBase.InvokeAsync(Action)"/> because
+    /// <see cref="NavigationManager.LocationChanged"/> can fire off the renderer's
+    /// synchronization context.
     /// </summary>
     private void HandleLocationChanged(object? sender, LocationChangedEventArgs e)
     {
-        ApplyQueryStringFilters();
-        _drawerOpen = false;
-        StateHasChanged();
+        _ = InvokeAsync(() =>
+        {
+            ApplyQueryStringFilters();
+            _drawerOpen = false;
+            StateHasChanged();
+        });
     }
 
     public void Dispose()
@@ -86,6 +91,10 @@ public partial class AuditLogPage : IDisposable
         var uri = Navigation.ToAbsoluteUri(Navigation.Uri);
         var query = QueryHelpers.ParseQuery(uri.Query);
 
+        // A paramless navigation (e.g. clicking the "Audit Log" nav link while
+        // already here) intentionally preserves the last applied filter rather
+        // than clearing the grid: this method is a drill-in mechanism and every
+        // drill-in carries query params. The operator clears via the filter bar.
         if (query.Count == 0)
         {
             return;