feat: support Github Flavored Markdown

frontend/src/core/streamdown/plugins.ts

@@ -0,0 +1,13 @@
+import rehypeKatex from "rehype-katex";
+import remarkGfm from "remark-gfm";
+import remarkMath from "remark-math";
+import type { StreamdownProps } from "streamdown";
+
+export const streamdownPlugins = {
+  remarkPlugins: [
+    [remarkGfm, [remarkMath, { singleDollarTextMath: true }]],
+  ] as StreamdownProps["remarkPlugins"],
+  rehypePlugins: [
+    [rehypeKatex, { output: "html" }],
+  ] as StreamdownProps["rehypePlugins"],
+};