Deliver each drop to the zone under the cursor (#953)

app/MindWork AI Studio/Assistants/AssistantBase.razor

@@ -2,7 +2,9 @@
 @inherits AssistantLowerBase
 @typeparam TSettings
 
-<div class="inner-scrolling-context">
+@* Every assistant is a drop area: a file dropped anywhere inside it lands on the assistant's
+   default zone, while a file dropped on one of its specific zones lands there. *@
+<PathDropZone IsArea="@true" Class="inner-scrolling-context">
 
     <MudStack Row="true" AlignItems="AlignItems.Center" Class="mb-2 mr-3" StretchItems="StretchItems.Start">
         <MudText Typo="Typo.h3">
@@ -186,4 +188,4 @@
             </MudStack>
         </FooterContent>
     </InnerScrolling>
-</div>
+</PathDropZone>