🐛 Fix regression introduced on the set-grid-layout-cells fn

Incorrect data is used for calcultate the size

frontend/src/app/render_wasm/api.cljs

@@ -489,7 +489,7 @@
 (defn set-grid-layout-cells
   [cells]
   (let [entries (vals cells)
-        size    (mem/get-alloc-size entries GRID-LAYOUT-CELL-U8-SIZE)
+        size    (mem/get-alloc-size cells GRID-LAYOUT-CELL-U8-SIZE)
         offset  (mem/alloc size)
         heap    (-> (mem/get-heap-u8)
                     (mem/view offset size))]

render-wasm/src/shapes/layouts.rs

@@ -385,6 +385,7 @@ impl GridData {
     }
 }
 
+// FIXME: use transmute
 #[derive(Debug)]
 #[repr(C)]
 pub struct RawGridTrack {