fix(mobile): use cached thumbnail in full size image provider (#20637)

mobile/lib/extensions/build_context_extensions.dart

@@ -13,6 +13,9 @@ extension ContextHelper on BuildContext {
   // Returns the current height from MediaQuery
   double get height => MediaQuery.sizeOf(this).height;
 
+  // Returns the current size from MediaQuery
+  Size get sizeData => MediaQuery.sizeOf(this);
+
   // Returns true if the app is running on a mobile device (!tablets)
   bool get isMobile => width < 550;