feat: 完成四种字母描红开发

miniprogram/core/draw/baseDraw.ts

@@ -13,7 +13,7 @@ import drawHeader from './drawHeader';
  * - 分割线绘制
  * - 打印配置管理
  */
-const LINE_COLOR = 'rgba(50, 46, 37, 0.4)';
+const LINE_COLOR = '#BCBAB2'; // 打印友好的深灰线色，避免渐变色
 const LINE_WIDTH = 3;
 
 export class BaseDrawService {

miniprogram/core/draw/drawHeader.ts

@@ -23,7 +23,7 @@ const META_FONT = '14px "Microsoft Yahei"';
 const META_FONT_PX = 12;
 const META_UNDERLINE_GAP = 3;
 const TITLE_COLOR = '#322E25';
-const LINE_COLOR = 'rgba(50, 46, 37, 0.4)';
+const LINE_COLOR = '#BCBAB2';
 const LINE_WIDTH = 3;
 const META_COLOR = '#7C766A';
 const META_ROW_MARGIN_X = 130;