feat: support markdown

ui/components/Markdown/renderer/text.tsx

@@ -0,0 +1,19 @@
+import type { Text } from "@yozora/ast";
+import React from "react";
+
+/**
+ * Render `text`.
+ *
+ * @see https://www.npmjs.com/package/@yozora/ast#text
+ * @see https://www.npmjs.com/package/@yozora/tokenizer-text
+ */
+export class TextRenderer extends React.Component<Text> {
+  public override shouldComponentUpdate(nextProps: Readonly<Text>): boolean {
+    const props = this.props;
+    return props.value !== nextProps.value;
+  }
+
+  public override render(): React.ReactElement {
+    return <React.Fragment>{this.props.value}</React.Fragment>;
+  }
+}