[CodeHealth] Remove remaining uses of global app var (#3868)

src/components/graph/GraphCanvas.vue

@@ -292,10 +292,8 @@ onMounted(async () => {
   canvasStore.canvas.render_canvas_border = false
   workspaceStore.spinner = false
 
-  // @ts-expect-error fixme ts strict error
-  window['app'] = comfyApp
-  // @ts-expect-error fixme ts strict error
-  window['graph'] = comfyApp.graph
+  window.app = comfyApp
+  window.graph = comfyApp.graph
 
   comfyAppReady.value = true
 

src/components/graph/SelectionOverlay.vue

@@ -79,7 +79,7 @@ watch(
     if (draggingItems === false) {
       setTimeout(() => {
         visible.value = true
-        positionSelectionOverlay(canvasStore.canvas as LGraphCanvas)
+        positionSelectionOverlay(canvasStore.getCanvas())
       }, 100)
     } else {
       // Selection change update to visible state is delayed by a frame. Here