Update IsSupported to check feature readiness state

Improved IsSupported logic in ObjectEraseHelper to return true only when the object erase model is ready or can be downloaded, ensuring unsupported states are handled correctly.

Author: TheJoeFin

MagickCrop/Helpers/ObjectEraseHelper.cs

@@ -20,8 +20,10 @@ internal static bool IsSupported()
     {
         try
         {
-            _ = ImageObjectRemover.GetReadyState();
-            return true;
+            AIFeatureReadyState state = ImageObjectRemover.GetReadyState();
+            // Only consider it supported if the model is ready or can be downloaded.
+            // Other states (e.g. EvaluationNotReady, DisabledByUser) mean it's not usable.
+            return state is AIFeatureReadyState.Ready or AIFeatureReadyState.NotReady;
         }
         catch
         {