fix(lesson): support quiz mode and improve responsive layout for mobile and laptop

app/static/js/modules/srs.js

@@ -182,11 +182,21 @@ export function initSrs() {
         startSrsTrainingSession(false);
     });
 
+    // Restore saved SRS mode if present
+    const savedSrsMode = localStorage.getItem('srs_active_mode');
+    if (savedSrsMode && ['flashcards', 'quiz', 'typing', 'cloze', 'dictation', 'listening'].includes(savedSrsMode)) {
+        srsCurrentMode = savedSrsMode;
+        srsTabs.forEach(t => {
+            t.classList.toggle('active', t.dataset.mode === savedSrsMode);
+        });
+    }
+
     srsTabs.forEach(tab => {
         tab.addEventListener('click', () => {
             srsTabs.forEach(t => t.classList.remove('active'));
             tab.classList.add('active');
             srsCurrentMode = tab.dataset.mode;
+            localStorage.setItem('srs_active_mode', srsCurrentMode);
             renderSrsCurrentCard();
         });
     });