feat(post-desktop): truncate long file links with ellipsis in middle

src/lib/utils/string-utils.ts

@@ -20,3 +20,14 @@ export function formatUserIDForDisplay(userID: string | undefined, maxDomainLeng
   // Otherwise, shorten to 8 characters
   return userID.slice(0, 8);
 }
+
+/**
+ * Truncate a string with "..." in the middle when it exceeds maxLength.
+ * Preserves the start and end of the string for readability (e.g. URLs, filenames).
+ */
+export function truncateWithEllipsisInMiddle(str: string, maxLength: number = 50): string {
+  if (!str || str.length <= maxLength) return str;
+  const ellipsis = '...';
+  const half = Math.floor((maxLength - ellipsis.length) / 2);
+  return str.slice(0, half) + ellipsis + str.slice(-half);
+}