feat: render markdown in chat

src/pages/playground/style/content-item.less

@@ -20,6 +20,18 @@
     display: none;
   }
 
+  .actions .mrkd-switch {
+    border-radius: 12px;
+
+    .ant-segmented-thumb,
+    .ant-segmented-item-selected,
+    .ant-segmented-item,
+    .ant-segmented-item::after {
+      border-radius: 10px;
+      overflow: hidden;
+    }
+  }
+
   &:hover {
     .actions {
       display: flex;

src/pages/playground/style/think-content.less

@@ -0,0 +1,13 @@
+.think-wrapper {
+  margin-bottom: 16px;
+  color: var(--ant-color-text-tertiary);
+  border-left: 2px solid var(--ant-color-fill-secondary);
+
+  .think-content {
+    white-space: pre-wrap;
+    padding: 6px 4px;
+    background-color: var(--ant-color-fill-tertiary);
+    color: var(--ant-color-text-tertiary);
+    border-radius: var(--border-radius-base);
+  }
+}