feat: support sending and preview links

js/src/lib/link-metadata.ts

@@ -0,0 +1,14 @@
+export interface LinkMetadata {
+  url: string;
+  title: string | null;
+  description: string | null;
+  image: string | null;
+  favicon: string | null;
+  domain: string;
+}
+
+const URL_REGEX = /https?:\/\/[^\s<>"')\]]+/g;
+
+export function extractUrls(text: string): string[] {
+  return Array.from(text.matchAll(URL_REGEX), (m) => m[0]);
+}