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src/views/InstructorView.js

@@ -1,5 +1,7 @@
 import { createRoom, subscribeToRoom, getChallenges, resetProgress, removeUser } from "../services/classroom.js";
 import { signInWithGoogle, signInWithGoogleRedirect, signOutUser, checkInstructorPermission, getInstructors, addInstructor, updateInstructor, removeInstructor } from "../services/auth.js";
+import { auth } from "../services/firebase.js";
+import { setPersistence, browserLocalPersistence } from "https://www.gstatic.com/firebasejs/10.7.1/firebase-auth.js"; // Direct import for forceful persistence
 import { generateMonsterSVG, getNextMonster, MONSTER_DEFS } from "../utils/monsterUtils.js";
 
 // Load html-to-image dynamically (Better support than html2canvas)
@@ -402,9 +404,17 @@ export function setupInstructorEvents() {
             // Attach listener if button exists
             const retryBtn = document.getElementById('redirect-login-btn');
             if (retryBtn) {
-                retryBtn.addEventListener('click', () => {
-                    localStorage.setItem('vibecoding_redirect_login', 'true'); // Flag for main.js
-                    signInWithGoogleRedirect().catch(e => alert("跳轉失敗: " + e.message));
+                retryBtn.addEventListener('click', async () => {
+                    localStorage.setItem('vibecoding_redirect_login', 'true');
+                    try {
+                        const { auth } = await import("../services/firebase.js");
+                        const { setPersistence, browserLocalPersistence } = await import("firebase/auth");
+                        await setPersistence(auth, browserLocalPersistence); // Force persistence
+                        console.log("Persistence set to LOCAL");
+                        await signInWithGoogleRedirect();
+                    } catch (e) {
+                        alert("跳轉失敗: " + e.message);
+                    }
                 });
             }