refactor(vocab): unify text normalization across VocabService and VocabPracticeDialog

- Enhanced text normalization methods in VocabService and VocabPracticeDialog to include normalization and improved regex for punctuation and symbols, ensuring consistent text handling.
- This update streamlines the normalization process, contributing to better user input processing and overall application reliability.

frontend/src/views/social/VocabLessonView.vue

@@ -2701,12 +2701,14 @@ export default {
       }
     },
     normalizeComparableText(value) {
-      return String(value || '')
+      const normalized = String(value || '')
         .trim()
         .toLowerCase()
-        .replace(/[\p{P}]+/gu, ' ')
+        .normalize('NFKC')
+        .replace(/[\p{P}\p{S}]+/gu, ' ')
         .replace(/\s+/g, ' ')
         .trim();
+      return normalized.replace(/\s+/g, '');
     },
     normalizeVocab(s) {
       return this.normalizeComparableText(s);