The description linkifier only caught http(s):// URLs; extend it to www.* hosts and
bare domain.tld/path URLs (both get an https:// href prefix), so links like
www.amelielens.com and facebook.com/amelielensmusic become clickable too. A required
path + letters-only TLD keep false positives (version numbers, file names) out; bare
@handles and #hashtags stay plain (the platform is ambiguous).