docs: add jsdoc

src/pages/DX4AppPage.jsx

@@ -24,7 +24,11 @@ import { useAtom } from "jotai";
 import { API_BASE_URL } from "../App";
 import { copyDXLink, ifstyle } from "../trash/helpers";
 import { useWebHaptics } from "web-haptics/react";
+import { DengiCaching } from "../trash/dengiCashingSystem";
 
+/**
+ * @param {{classIDAtom,adminAtom,setsetRoute,routeAtom,pickmeModeAtom,dengi_cash: DengiCaching}} param0
+ */
 export function DX4App({
   classIDAtom,
   adminAtom,
@@ -154,6 +158,9 @@ export function DX4App({
     })();
   }, [classId, adminId]);
 
+  /**
+   * @param {KeyboardEvent} event 
+   */
   const handleKeyPress = (event) => {
     switch (event.key) {
       case "a":