style: 调整AI功能中气泡标题字体

src/styles/reset.scss

@@ -158,15 +158,20 @@ div.markdown-body {
   color: #333;
 }
 
-.markdown-body h1,
-.markdown-body h2,
-.markdown-body h3,
-.markdown-body h4,
-.markdown-body h5,
-.markdown-body h6 {
+div.markdown-body h1,
+div.markdown-body h2,
+div.markdown-body h3,
+div.markdown-body h4,
+div.markdown-body h5,
+div.markdown-body h6 {
   margin: 1em 0 0.5em;
+  font-size: 14px;
   font-weight: bold;
 }
+
+div.markdown-body h1 {
+  font-size: 16px;
+}
 .markdown-body p {
   margin: 1em 0;
 }