feat(bisaya-course): restructure core patterns and enhance vocabulary preparation

- Updated core patterns in various scripts to use an object format with target phrases and glosses, improving clarity and usability for learners.
- Enhanced the VocabService to normalize core pattern entries, ensuring consistent handling of vocabulary data.
- Introduced new vocabulary preparation steps in the VocabLessonView, guiding users through active review processes before engaging with the vocabulary trainer.
- Added localization support for new vocabulary preparation hints and instructions in multiple languages, enhancing user experience across the application.

backend/services/vocabService.js

@@ -106,7 +106,13 @@ export default class VocabService {
       `Lektion: ${lesson?.title || 'Unbekannte Lektion'}`,
       lesson?.description ? `Beschreibung: ${lesson.description}` : '',
       learningGoals.length ? `Lernziele: ${learningGoals.join(' | ')}` : '',
-      corePatterns.length ? `Kernmuster: ${corePatterns.join(' | ')}` : '',
+      corePatterns.length
+        ? `Kernmuster: ${corePatterns.map((p) => {
+          const n = this._normalizeCorePatternEntry(p);
+          if (!n) return '';
+          return n.gloss ? `${n.target} (${n.gloss})` : n.target;
+        }).filter(Boolean).join(' | ')}`
+        : '',
       speakingPrompts.length
         ? `Sprechaufträge: ${speakingPrompts.map((item) => item.prompt || item.title || '').filter(Boolean).join(' | ')}`
         : '',
@@ -239,14 +245,16 @@ export default class VocabService {
 
     speakingPrompts.forEach((prompt, index) => {
       const learning = String(prompt?.prompt || prompt?.title || '').trim();
-      const reference = String(prompt?.cue || corePatterns[index] || corePatterns[0] || '').trim();
+      const refEntry = corePatterns[index] ?? corePatterns[0];
+      const reference = String(prompt?.cue || this._corePatternTarget(refEntry) || '').trim();
       if (!learning || !reference || learning === reference) return;
       vocabMap.set(`${learning}-${reference}`, { learning, reference });
     });
 
     practicalTasks.forEach((task, index) => {
       const learning = String(task?.text || task?.title || '').trim();
-      const reference = String(corePatterns[index] || corePatterns[0] || '').trim();
+      const refEntry = corePatterns[index] ?? corePatterns[0];
+      const reference = String(this._corePatternTarget(refEntry) || '').trim();
       if (!learning || !reference || learning === reference) return;
       vocabMap.set(`${learning}-${reference}`, { learning, reference });
     });
@@ -270,6 +278,49 @@ export default class VocabService {
     return [];
   }
 
+  /**
+   * Kernmuster: Zielsprachen-Phrase + optionale Glossierung (z. B. Deutsch).
+   * Unterstützt Legacy-Strings, "Phrase|Gloss" und Objekte { target, gloss } / { ceb, de }.
+   */
+  _normalizeCorePatternEntry(entry) {
+    if (entry === null || entry === undefined || entry === '') {
+      return null;
+    }
+    if (typeof entry === 'object' && !Array.isArray(entry)) {
+      const target = String(entry.target ?? entry.ceb ?? entry.phrase ?? '').trim();
+      const gloss = String(entry.gloss ?? entry.de ?? entry.translation ?? '').trim();
+      if (!target) return null;
+      return { target, gloss };
+    }
+    const s = String(entry).trim();
+    if (!s) return null;
+    const pipe = s.indexOf('|');
+    if (pipe !== -1) {
+      const target = s.slice(0, pipe).trim();
+      const gloss = s.slice(pipe + 1).trim();
+      if (!target) return null;
+      return { target, gloss };
+    }
+    return { target: s, gloss: '' };
+  }
+
+  _normalizeCorePatternList(value) {
+    if (!value) return [];
+    const raw = Array.isArray(value)
+      ? value
+      : (typeof value === 'string'
+        ? value.split(/\r?\n|;/).map((entry) => entry.trim()).filter(Boolean)
+        : []);
+    return raw
+      .map((entry) => this._normalizeCorePatternEntry(entry))
+      .filter(Boolean);
+  }
+
+  _corePatternTarget(entry) {
+    const n = this._normalizeCorePatternEntry(entry);
+    return n ? n.target : '';
+  }
+
   _normalizeStructuredList(value, keys = ['title', 'text']) {
     if (!value) return [];
     if (Array.isArray(value)) {
@@ -482,7 +533,7 @@ export default class VocabService {
     const uniquePatterns = [...new Set(patterns.map((item) => String(item || '').trim()).filter(Boolean))];
 
     const learningGoals = this._normalizeStringList(plainLesson.learningGoals);
-    const corePatterns = this._normalizeStringList(plainLesson.corePatterns);
+    const corePatterns = this._normalizeCorePatternList(plainLesson.corePatterns);
     const grammarFocus = this._normalizeStructuredList(plainLesson.grammarFocus, ['title', 'text', 'example']);
     const explicitSpeakingPrompts = this._normalizeStructuredList(plainLesson.speakingPrompts, ['title', 'prompt', 'cue']);
     const practicalTasks = this._normalizeStructuredList(plainLesson.practicalTasks, ['title', 'text']);
@@ -495,7 +546,9 @@ export default class VocabService {
             'Ein bis zwei Satzmuster aktiv anwenden.',
             'Kurze Sätze oder Mini-Dialoge zum Thema selbst bilden.'
           ],
-      corePatterns: corePatterns.length > 0 ? corePatterns : uniquePatterns.slice(0, 5),
+      corePatterns: corePatterns.length > 0
+        ? corePatterns
+        : uniquePatterns.slice(0, 5).map((s) => ({ target: String(s || '').trim(), gloss: '' })).filter((p) => p.target),
       grammarFocus: grammarFocus.length > 0 ? grammarFocus : uniqueGrammarExplanations.slice(0, 4),
       speakingPrompts: explicitSpeakingPrompts.length > 0 ? explicitSpeakingPrompts : speakingPrompts.slice(0, 4),
       practicalTasks: practicalTasks.length > 0
@@ -1775,7 +1828,7 @@ export default class VocabService {
       audioUrl: audioUrl || null,
       culturalNotes: culturalNotes || null,
       learningGoals: this._normalizeStringList(learningGoals),
-      corePatterns: this._normalizeStringList(corePatterns),
+      corePatterns: this._normalizeCorePatternList(corePatterns),
       grammarFocus: this._normalizeStructuredList(grammarFocus, ['title', 'text', 'example']),
       speakingPrompts: this._normalizeStructuredList(speakingPrompts, ['title', 'prompt', 'cue']),
       practicalTasks: this._normalizeStructuredList(practicalTasks, ['title', 'text']),
@@ -1822,7 +1875,7 @@ export default class VocabService {
     if (audioUrl !== undefined) updates.audioUrl = audioUrl;
     if (culturalNotes !== undefined) updates.culturalNotes = culturalNotes;
     if (learningGoals !== undefined) updates.learningGoals = this._normalizeStringList(learningGoals);
-    if (corePatterns !== undefined) updates.corePatterns = this._normalizeStringList(corePatterns);
+    if (corePatterns !== undefined) updates.corePatterns = this._normalizeCorePatternList(corePatterns);
     if (grammarFocus !== undefined) updates.grammarFocus = this._normalizeStructuredList(grammarFocus, ['title', 'text', 'example']);
     if (speakingPrompts !== undefined) updates.speakingPrompts = this._normalizeStructuredList(speakingPrompts, ['title', 'prompt', 'cue']);
     if (practicalTasks !== undefined) updates.practicalTasks = this._normalizeStructuredList(practicalTasks, ['title', 'text']);