feat(VocabLessonView): implement vocab trainer continue timer management

- Added a new timer management feature to the vocab trainer, allowing for better control over the continuation of questions after user answers.
- Introduced `clearVocabTrainerContinueTimer` method to prevent multiple timers from running simultaneously, enhancing the stability of the training session.
- Updated various methods to utilize the new timer management, ensuring a smoother user experience during vocabulary training.

frontend/src/views/social/VocabLessonView.vue

@@ -1084,6 +1084,7 @@ export default {
       vocabTrainerSelectedChoice: null,
       vocabTrainerAnswered: false,
       vocabTrainerLastCorrect: false,
+      vocabTrainerContinueTimer: null,
       vocabTrainerDirection: 'L2R', // L2R: learning->reference, R2L: reference->learning
       isCheckingLessonCompletion: false, // Flag um Endlosschleife zu verhindern
       isNavigatingToNext: false, // Flag um mehrfache Navigation zu verhindern
@@ -3329,6 +3330,7 @@ export default {
     // Vokabeltrainer-Methoden
     startVocabTrainer() {
       debugLog('[VocabLessonView] startVocabTrainer aufgerufen');
+      this.clearVocabTrainerContinueTimer();
       if (!this.trainableLessonVocab || this.trainableLessonVocab.length === 0) {
         debugLog('[VocabLessonView] Keine Vokabeln vorhanden');
         return;
@@ -3361,6 +3363,7 @@ export default {
       });
     },
     stopVocabTrainer() {
+      this.clearVocabTrainerContinueTimer();
       this.vocabTrainerActive = false;
       this.vocabTrainerMode = 'multiple_choice';
       this.vocabTrainerAutoSwitchedToTyping = false;
@@ -3564,10 +3567,17 @@ export default {
       return ranked[0]?.vocab || pool[Math.floor(Math.random() * pool.length)];
     },
     continueAfterVocabAnswer() {
+      this.clearVocabTrainerContinueTimer();
       const completedKey = this.currentVocabQuestion?.key || '';
       this.advanceRepeatQueue(completedKey);
       this.nextVocabQuestion();
     },
+    clearVocabTrainerContinueTimer() {
+      if (this.vocabTrainerContinueTimer) {
+        window.clearTimeout(this.vocabTrainerContinueTimer);
+        this.vocabTrainerContinueTimer = null;
+      }
+    },
     checkVocabModeSwitch() {
       this.updateExerciseUnlockState();
 
@@ -3731,6 +3741,7 @@ export default {
     },
     nextVocabQuestion() {
       debugLog('[VocabLessonView] nextVocabQuestion aufgerufen');
+      this.clearVocabTrainerContinueTimer();
       if (!this.vocabTrainerPool || this.vocabTrainerPool.length === 0) {
         debugLog('[VocabLessonView] Keine Vokabeln im Pool');
         this.currentVocabQuestion = null;
@@ -3951,9 +3962,19 @@ export default {
         // Prüfe ob noch Fragen vorhanden sind
         if (this.vocabTrainerPool && this.vocabTrainerPool.length > 0) {
           const delay = this.vocabTrainerMode === 'multiple_choice' ? 1000 : 500; // 1 Sekunde für Multiple Choice, 500ms für Typing
-          setTimeout(() => {
+          const answeredQuestionKey = this.currentVocabQuestion?.key || '';
+          this.clearVocabTrainerContinueTimer();
+          this.vocabTrainerContinueTimer = window.setTimeout(() => {
+            this.vocabTrainerContinueTimer = null;
             // Prüfe erneut, ob noch Fragen vorhanden sind (könnte sich geändert haben)
-            if (this.vocabTrainerPool && this.vocabTrainerPool.length > 0 && this.vocabTrainerActive) {
+            if (
+              this.vocabTrainerPool
+              && this.vocabTrainerPool.length > 0
+              && this.vocabTrainerActive
+              && this.vocabTrainerAnswered
+              && this.vocabTrainerLastCorrect
+              && this.currentVocabQuestion?.key === answeredQuestionKey
+            ) {
               this.continueAfterVocabAnswer();
             }
           }, delay);
@@ -4089,6 +4110,7 @@ export default {
       window.clearTimeout(this.lessonStateSaveTimer);
       this.lessonStateSaveTimer = null;
     }
+    this.clearVocabTrainerContinueTimer();
     this.stopAssistantWaitTimer();
     // Stoppe alle aktiven Recognition-Instanzen
     Object.keys(this.activeRecognition).forEach(exerciseId => {