refactor(bisaya-course): enhance pedagogy logic for German lessons

- Updated the `getGermanForBisayaLessonPedagogy` function to include lesson titles for improved didactic mode determination, specifically adding support for 'contrast_training'.
- Modified multiple scripts to utilize the updated pedagogy function, ensuring consistent application of the new logic across various course phases.
- Enhanced the VocabService to recognize and handle 'contrast_training' as a didactic mode, improving lesson management and user experience.
- Updated UI components to reflect the new didactic mode, ensuring clarity in lesson presentation.

backend/scripts/create-german-for-bisaya-course.js

@@ -106,7 +106,7 @@ async function createGermanForBisayaCourse(ownerHashedId) {
 
   for (const lessonData of ALL_GERMAN_FOR_BISAYA_LESSONS) {
     const didactics = ALL_GERMAN_FOR_BISAYA_DIDACTICS[lessonData.title] || {};
-    const pedagogy = getGermanForBisayaLessonPedagogy(lessonData.num, lessonData.type);
+    const pedagogy = getGermanForBisayaLessonPedagogy(lessonData.num, lessonData.type, lessonData.title);
 
     await VocabCourseLesson.create({
       courseId: course.id,

backend/scripts/extend-german-for-bisaya-course-phase3.js

@@ -37,7 +37,7 @@ async function extendGermanForBisayaPhase3() {
       if (existing) continue;
 
       const didactics = GERMAN_FOR_BISAYA_PHASE3_DIDACTICS[lessonData.title] || {};
-      const pedagogy = getGermanForBisayaLessonPedagogy(lessonData.num, lessonData.type);
+      const pedagogy = getGermanForBisayaLessonPedagogy(lessonData.num, lessonData.type, lessonData.title);
 
       await VocabCourseLesson.create({
         courseId: course.id,

backend/scripts/extend-german-for-bisaya-course-phase4.js

@@ -37,7 +37,7 @@ async function extendGermanForBisayaPhase4() {
       if (existing) continue;
 
       const didactics = GERMAN_FOR_BISAYA_PHASE4_DIDACTICS[lessonData.title] || {};
-      const pedagogy = getGermanForBisayaLessonPedagogy(lessonData.num, lessonData.type);
+      const pedagogy = getGermanForBisayaLessonPedagogy(lessonData.num, lessonData.type, lessonData.title);
 
       await VocabCourseLesson.create({
         courseId: course.id,

backend/scripts/extend-german-for-bisaya-course-phase5.js

@@ -37,7 +37,7 @@ async function extendGermanForBisayaPhase5() {
       if (existing) continue;
 
       const didactics = GERMAN_FOR_BISAYA_PHASE5_DIDACTICS[lessonData.title] || {};
-      const pedagogy = getGermanForBisayaLessonPedagogy(lessonData.num, lessonData.type);
+      const pedagogy = getGermanForBisayaLessonPedagogy(lessonData.num, lessonData.type, lessonData.title);
 
       await VocabCourseLesson.create({
         courseId: course.id,

backend/scripts/german-for-bisaya-phase2-pedagogy.js

@@ -1,14 +1,37 @@
-export function getGermanForBisayaLessonPedagogy(lessonNumber, lessonType) {
+function isContrastTrainingLesson(lessonType, lessonTitle = '') {
+  const normalizedType = String(lessonType || '').toLowerCase();
+  if (normalizedType !== 'grammar') {
+    return false;
+  }
+
+  const title = String(lessonTitle || '').toLowerCase();
+  return [
+    'kontrast',
+    'fehlertraining',
+    ' / ',
+    'nicht / kein',
+    'der / die / das',
+    'wo / wohin',
+    'du / sie',
+    'haben / sein',
+    'ich bin / ich habe',
+    'ich bin / ich heiße / ich komme'
+  ].some((marker) => title.includes(marker));
+}
+
+export function getGermanForBisayaLessonPedagogy(lessonNumber, lessonType, lessonTitle = '') {
   const phaseLabel = lessonNumber <= 60 ? 'quickstart' : lessonNumber <= 120 ? 'daily_life' : 'stabilization';
   const blockNumber = Math.ceil(lessonNumber / 10);
 
   let didacticMode = 'core_input';
   if (lessonType === 'conversation') didacticMode = 'guided_dialogue';
   if (lessonType === 'grammar') didacticMode = 'pattern_drill';
+  if (isContrastTrainingLesson(lessonType, lessonTitle)) didacticMode = 'contrast_training';
   if (lessonType === 'review') didacticMode = 'intensive_review';
   if (lessonType === 'culture') didacticMode = 'real_life_scenario';
 
   const difficultyWeight =
+    didacticMode === 'contrast_training' ? 3 :
     lessonType === 'grammar' ? 3 :
     lessonType === 'review' ? 2 :
     lessonType === 'conversation' ? 2 :
@@ -16,6 +39,7 @@ export function getGermanForBisayaLessonPedagogy(lessonNumber, lessonType) {
 
   const newUnitTarget =
     lessonType === 'review' ? 2 :
+    didacticMode === 'contrast_training' ? 3 :
     lessonType === 'grammar' ? 4 :
     phaseLabel === 'quickstart' ? 6 :
     phaseLabel === 'daily_life' ? 5 :
@@ -23,6 +47,7 @@ export function getGermanForBisayaLessonPedagogy(lessonNumber, lessonType) {
 
   const reviewWeight =
     lessonType === 'review' ? 90 :
+    didacticMode === 'contrast_training' ? 70 :
     lessonType === 'grammar' ? 60 :
     lessonType === 'vocab' ? 55 :
     lessonType === 'culture' ? 20 :

backend/services/vocabService.js

@@ -620,11 +620,32 @@ export default class VocabService {
   }
 
   _inferLessonDidacticMode(plainLesson) {
-    if (plainLesson.didacticMode) {
-      return plainLesson.didacticMode;
-    }
     const lessonType = String(plainLesson.lessonType || '').toLowerCase();
     const title = String(plainLesson.title || '').toLowerCase();
+    const storedMode = String(plainLesson.didacticMode || '').trim();
+
+    const isContrastTraining = lessonType === 'grammar' && [
+      'kontrast',
+      'fehlertraining',
+      ' / ',
+      'nicht / kein',
+      'der / die / das',
+      'wo / wohin',
+      'du / sie',
+      'haben / sein',
+      'ich bin / ich habe',
+      'ich bin / ich heiße / ich komme'
+    ].some((marker) => title.includes(marker));
+
+    if (storedMode && storedMode !== 'pattern_drill') {
+      return storedMode;
+    }
+    if (isContrastTraining) {
+      return 'contrast_training';
+    }
+    if (storedMode) {
+      return storedMode;
+    }
     if (title.includes('abschluss') || title.includes('prüfung') || title.includes('test')) {
       return 'checkpoint';
     }
@@ -648,6 +669,7 @@ export default class VocabService {
       return plainLesson.difficultyWeight;
     }
     switch (didacticMode) {
+      case 'contrast_training':
       case 'pattern_drill':
         return 3;
       case 'guided_dialogue':
@@ -666,6 +688,8 @@ export default class VocabService {
       return plainLesson.newUnitTarget;
     }
     switch (didacticMode) {
+      case 'contrast_training':
+        return 3;
       case 'core_input':
         return 8;
       case 'guided_dialogue':
@@ -692,6 +716,8 @@ export default class VocabService {
         return 90;
       case 'checkpoint':
         return 70;
+      case 'contrast_training':
+        return 70;
       case 'pattern_drill':
         return 55;
       case 'real_life_scenario':