添加动词拼接学习页

整合动词拼接沙盒，并扩充常见复合动词词库，方便在歌词学习之外进行动词组合练习。

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/LineItem.tsx

@@ -350,7 +350,7 @@ export const LineItem: React.FC<LineItemProps> = ({
             e.stopPropagation();
             onNoteClick(earliestNote!);
           }}
-          className={`${colorClass} px-1 rounded border-b-2 font-medium cursor-pointer transition-all duration-200 inline-block active:scale-95`}
+          className={`${colorClass} px-1 border-b-2 font-medium cursor-pointer transition-all duration-200 inline-block active:scale-95`}
           title={`点击查看注释: ${earliestNote.comment}`}
         >
           {matchText}
@@ -456,7 +456,7 @@ export const LineItem: React.FC<LineItemProps> = ({
                 onDoubleClick(line.id);
               }
             }}
-            className={`flex flex-col w-full min-w-0 select-text overflow-hidden pr-0.5 font-mono hover:bg-[#FAF9F6]/80 rounded px-0.5 md:-mx-1 md:px-1 md:pr-1 md:overflow-visible ${
+            className={`flex flex-col w-full min-w-0 select-text overflow-hidden pr-0.5 font-mono hover:bg-[#FAF9F6]/80 px-0.5 md:-mx-1 md:px-1 md:pr-1 md:overflow-visible ${
               canEdit ? 'cursor-text' : 'cursor-default'
             }`}
           >