Markdown rendering for skills, refresh button on replay

- react-markdown + remark-gfm for proper skill SKILL.md rendering
- Prose styles matching dark theme (tables, code blocks, blockquotes)
- Strips YAML frontmatter before rendering
- Refresh button in session replay header

components/Markdown.tsx

@@ -0,0 +1,12 @@
+"use client";
+
+import ReactMarkdown from "react-markdown";
+import remarkGfm from "remark-gfm";
+
+export function Markdown({ content }: { content: string }) {
+  return (
+    <div className="prose-hermes">
+      <ReactMarkdown remarkPlugins={[remarkGfm]}>{content}</ReactMarkdown>
+    </div>
+  );
+}