fix(detail): capture guard fields before await to close re-entrancy window in OnParametersSetAsync

DeepDrftPublic.Client/Pages/TrackDetail.razor.cs

@@ -34,6 +34,13 @@ public partial class TrackDetail : ComponentBase, IDisposable
         // OnInitialized (which fires once per instance).
         if (_loadedEntryKey == EntryKey) return;
 
+        // Capture the key synchronously before any await so that a re-entrant call
+        // (rapid navigation or a re-render that changes EntryKey while Load is in flight)
+        // sees the correct guard state. Without this, a second OnParametersSetAsync
+        // for the same EntryKey would bypass the guard above and start a second Load,
+        // causing two ViewModel.Load calls to race on the single scoped instance.
+        _loadedEntryKey = EntryKey;
+
         // Guard the bridge on the key: a payload for a different track must not seed this
         // page (stale-bridge bleed across navigation).
         if (PersistentState.TryTakeFromJson<TrackDto>(PersistKey, out var restored)
@@ -48,8 +55,6 @@ public partial class TrackDetail : ComponentBase, IDisposable
         {
             await ViewModel.Load(EntryKey);
         }
-
-        _loadedEntryKey = EntryKey;
     }
 
     private Task PersistTrack()