Add JavaScript disabled message and error handling to app div

src/main.ts

@@ -6,14 +6,20 @@ import { initHotkey } from "./ts/hotkey";
 import { polyfill } from "./ts/polyfill";
 import { watchParamButton } from "./ts/plugins/embedscript";
 
-polyfill()
+let app: App;
+try {
+    polyfill()
 
-const app = new App({
-  target: document.getElementById("app"),
-});
-
-loadData()
-initHotkey()
-watchParamButton()
+    app = new App({
+      target: document.getElementById("app"),
+    });
+    
+    loadData()
+    initHotkey()
+    watchParamButton()    
+} catch (error) {
+    console.error(error, error.stack)
+    alert(error)
+}
 
 export default app;