minor UI text change

src/components/article/ArticleGenerationModal.tsx

@@ -163,7 +163,7 @@ export function ArticleGenerationModal({
             {/* 初始文章 */}
             <div>
               <Label htmlFor="input-article" className="mb-2">
-                初始文章 (Initial Article)
+                文章 ( 如需改寫文章可輸入在此，無則留空 )
               </Label>
               <Textarea
                 id="input-article"
@@ -182,7 +182,7 @@ export function ArticleGenerationModal({
                 onValueChange={(v) => setFormData(prev => ({ ...prev, cefr: v }))}
               >
                 <SelectTrigger id="cefr" className="w-full">
-                  <SelectValue placeholder="Select CEFR level (A1 - C2)" />
+                  <SelectValue placeholder="Select CEFR level (Below A1 - C2)" />
                 </SelectTrigger>
                 <SelectContent>
                   <SelectItem value="Below A1">Below A1</SelectItem>
@@ -285,7 +285,7 @@ export function ArticleGenerationModal({
             disabled={isGenerating}
           >
             {isGenerating && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
-            {isGenerating ? '生成中...' : '生成初始文章'}
+            {isGenerating ? '生成中...' : '生成 / 改寫文章'}
           </Button>
         </DialogFooter>
       </DialogContent>