Add OSC 8 terminal hyperlink rendering for markdown links

src/markdown.ts

@@ -24,6 +24,12 @@ export function renderMarkdown(text: string): string {
   // Italic: *text*
   result = result.replace(/\*(.+?)\*/g, "\x1b[3m$1\x1b[23m")
 
+  // Links: [text](url) → OSC 8 terminal hyperlink, underlined blue
+  result = result.replace(/(?<!!)\[([^\]]+)\]\(([^)]+)\)/g, (_, text, href) => {
+    const url = href.replace(/\s+"[^"]*"$/, "") // strip optional title
+    return `\x1b]8;;${url}\x07\x1b[4;38;5;75m${text}\x1b[24;39m\x1b]8;;\x07`
+  })
+
   // Restore code spans as light blue
   result = result.replace(/\x00CODE(\d+)\x00/g, (_, i) => {
     return `\x1b[38;5;147m${codeSpans[parseInt(i)]}\x1b[39m`