refactor(auth): add device auth reuse for legacy account migration

- imports device auth utility functions
- adds logic to reuse Epic Games device authentication from legacy mode
- loads device auth cookies (EPIC_SSO_RM, EPIC_DEVICE, EPIC_SESSION_AP) when available
- falls back to regular authentication if device auth is not present

This enables seamless transition for users migrating from legacy authentication while maintaining backward compatibility.

epic-claimer-new.js

@@ -14,6 +14,7 @@ import {
   handleSIGINT,
 } from './src/util.js';
 import { cfg } from './src/config.js';
+import { getDeviceAuths, setAccountAuth } from './src/device-auths.js';
 
 
 const URL_CLAIM = 'https://store.epicgames.com/en-US/free-games';
@@ -329,12 +330,26 @@ export const claimEpicGamesNew = async () => {
   const page = context.pages().length ? context.pages()[0] : await context.newPage();
   await page.setViewportSize({ width: cfg.width, height: cfg.height });
 
+  // Use device auths if available (from legacy mode)
+  const deviceAuths = await getDeviceAuths();
+  if (deviceAuths && cfg.eg_email) {
+    const accountAuth = deviceAuths[cfg.eg_email];
+    if (accountAuth) {
+      console.log('🔄 Reusing device auth from legacy mode');
+      const cookies = [
+        { name: 'EPIC_SSO_RM', value: accountAuth.deviceAuth?.refreshToken || '', domain: '.epicgames.com', path: '/' },
+        { name: 'EPIC_DEVICE', value: accountAuth.deviceAuth?.deviceId || '', domain: '.epicgames.com', path: '/' },
+        { name: 'EPIC_SESSION_AP', value: accountAuth.deviceAuth?.accountId || '', domain: '.epicgames.com', path: '/' },
+      ];
+      await context.addCookies(cookies);
+      console.log('✅ Device auth cookies loaded');
+    }
+  }
+
   let user;
 
   try {
     const auth = await getValidAuth({
-      email: cfg.eg_email,
-      password: cfg.eg_password,
       otpKey: cfg.eg_otpkey,
       reuseCookies: true,
       cookiesPath: COOKIES_PATH,