feat: added processing status message

src/components/ProcessButtons.js

@@ -1,27 +1,37 @@
 import styles from '@/app/page.module.css';
 import { exportStageSVG } from "@/lib";
-import { useCallback, useState } from "react";
+import { startTransition, useCallback, useState } from "react";
 
 export default function ProcessButtons() {
     const [image, setImage] = useState();
+    const [isLoading, setLoading] = useState();
 
     const onStageSVG = useCallback(async () => {
+        startTransition(() => {
+            setLoading(true);
+        })
         const svg = await exportStageSVG(window.Konva.stages[0]);
         setImage(svg);
+        setLoading(false);
     }, [setImage])
 
     const onNoImageSVG = useCallback(async () => {
+        startTransition(() => {
+            setLoading(true);
+        })
         const stage = window.Konva.stages[0];
         const imageNode = stage.getLayers()[0].findOne('Image');
         const svg = await exportStageSVG(stage, false, {
             onBefore: () => imageNode.hide(),
             onAfter: () => imageNode.show()
         });
         setImage(svg);
+        setLoading(false);
     }, [setImage])
 
     return (
         <>
+            {isLoading && <p>Processing...</p>}
             <div className={styles.grid}>
                 <button type="button" onClick={onStageSVG}>Stage to SVG</button>
                 <button type="button" onClick={onNoImageSVG}>Without Image to SVG</button>