refactor(editor): 优化富文本编辑器内容格式转换逻辑

- 改进 HTML 到 Markdown 的转换规则，处理块级元素和行内元素的嵌套关系
- 优化图片和视频标签的解析逻辑，确保附件正确提取
- 修复换行符处理问题，避免产生多余空行
- 增强居中文本和标题的格式转换准确性
- 清理调试日志和冗余代码

css/details.css

@@ -160,14 +160,21 @@
   line-height: 26px;
   margin-bottom: 66px;
 }
+#details .matter .matter-left .html * {
+  background: transparent !important;
+  color: #555555 !important;
+}
 #details .matter .matter-left .html a {
   text-decoration: underline;
-  color: #04b0d5;
+  color: #04b0d5 !important;
+}
+#details .matter .matter-left .html a * {
+  color: #04b0d5 !important;
 }
 #details .matter .matter-left .html .blue {
   font-size: 15px;
   line-height: 26px;
-  color: #026277;
+  color: #026277 !important;
   margin: 0 4px;
   text-decoration: none;
 }
@@ -176,19 +183,17 @@
   display: inline-block;
 }
 #details .matter .matter-left .html video {
-  margin: 0 auto;
+  margin: 0 auto 5px;
+  height: 300px;
+  display: block;
 }
 #details .matter .matter-left .html h1 {
   font-family: "PingFangSC-Semibold", "PingFang SC Semibold", "PingFang SC", sans-serif;
   font-weight: 650;
-  color: #000000;
+  color: #000000 !important;
   font-size: 18px;
   line-height: 30px;
 }
-#details .matter .matter-left .html tr,
-#details .matter .matter-left .html td {
-  background: transparent;
-}
 #details .matter .matter-left .last-time {
   color: #aaaaaa;
   font-size: 13px;