fix: 更新組件內容和提示文字優化

## 🔧 組件內容改善
- VocabChoiceTest: 移除同義詞顯示區塊，簡化布局
- SentenceReorderTest: 優化提示文字為"請嘗試組成完整句子"

## 🎯 用戶體驗改善
- 更清晰的指導文字
- 更簡潔的界面設計
- 保持功能完整性

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/components/review/review-tests/SentenceReorderTest.tsx

@@ -94,7 +94,7 @@ const SentenceReorderTestComponent: React.FC<SentenceReorderTestProps> = ({
           <div className="relative min-h-[120px] bg-gray-50 rounded-lg p-4 border-2 border-dashed border-gray-300">
             {arrangedWords.length === 0 ? (
               <div className="absolute inset-0 flex items-center justify-center text-gray-400 text-lg">
-                將下方單字拖拽到這裡組成完整句子
+                請嘗試組成完整句子
               </div>
             ) : (
               <div className="flex flex-wrap gap-2">

frontend/components/review/review-tests/VocabChoiceTest.tsx

@@ -54,23 +54,6 @@ const VocabChoiceTestComponent: React.FC<VocabChoiceTestProps> = ({
             <h3 className="font-semibold text-gray-900 mb-2 text-left">定義</h3>
             <p className="text-gray-700 text-left">{cardData.definition}</p>
           </div>
-
-          {/* 同義詞顯示 */}
-          {cardData.synonyms && cardData.synonyms.length > 0 && (
-            <div className="bg-blue-50 rounded-lg p-4 mb-6">
-              <h3 className="font-semibold text-gray-900 mb-2 text-left">同義詞提示</h3>
-              <div className="flex flex-wrap gap-2 justify-start">
-                {cardData.synonyms.map((synonym, index) => (
-                  <span
-                    key={index}
-                    className="px-3 py-1 bg-blue-100 text-blue-700 text-sm rounded-full font-medium"
-                  >
-                    {synonym}
-                  </span>
-                ))}
-              </div>
-            </div>
-          )}
         </div>
 
         {/* 選項區域 - 響應式網格布局 */}