feat: verbessere SRS-Logik mit Fallback-Mechanismus und Debug-Ausgaben für die Initialisierung

frontend/src/dialogues/socialnetwork/VocabPracticeDialog.vue

@@ -535,6 +535,20 @@ export default {
 
       const doneSet = new Set(Array.isArray(this.srsSession.doneIds) ? this.srsSession.doneIds : []);
       this.srsQueueIds = dueIds.filter((id) => !doneSet.has(id));
+      try {
+        console.debug('[VocabPracticeDialog] initSrsSessionFromPool', { courseId: this.openParams?.courseId, dueIdsLen: dueIds.length, srsQueueLen: this.srsQueueIds.length, stored: !!this.srsSession });
+      } catch (_) {}
+
+      // Fallback: if SRS mode but queue is empty (e.g. mismatch between stored session and current pool), fall back to pool order
+      if (this.srsMode && Array.isArray(this.srsQueueIds) && this.srsQueueIds.length === 0) {
+        const fallbackIds = (this.pool || []).map((it) => it.id).filter(Boolean);
+        if (fallbackIds.length > 0) {
+          try { console.debug('[VocabPracticeDialog] initSrsSessionFromPool: srsQueueIds empty, falling back to pool ids', { fallbackLen: fallbackIds.length }); } catch (_) {}
+          this.srsQueueIds = fallbackIds;
+          // keep initialTotalDue stable if possible
+          if (!this.srsSession) this.srsSession = { version: SRS_SESSION_STORAGE_VERSION, dateKey: this.getLocalDateKey(), courseId: this.openParams.courseId, initialTotalDue: fallbackIds.length, initialDueIds: fallbackIds, doneIds: [], correctCount: 0, wrongCount: 0 };
+        }
+      }
       this.saveSrsSession();
     },
     open({ languageId, chapterId, lessonId, courseId, initialPool = null, srsMode = false, onClose = null }) {
@@ -572,6 +586,10 @@ export default {
         document.addEventListener('keydown', this.handleKeyDown);
       });
       this.loadHardVocabMap();
+      // Expose instance for temporary debugging in browser console
+      try {
+        window.__vocabPracticeDialog = this;
+      } catch (_) {}
       this.reloadPool();
     },
     close() {