fix: Add tests for special characters in email

Author: xosnrdev

src/utils/text.rs

@@ -13,7 +13,7 @@ pub fn suppress_github_mentions(text: &str) -> String {
 
     let segment = r"[a-zA-Z0-9][a-zA-Z0-9\-]{0,38}";
     let pattern = format!(
-        r"(^|[^a-zA-Z0-9_])(@{0}(?:/{0})*)($|[^a-zA-Z0-9_\-])",
+        r"(^|[^a-zA-Z0-9_])(@{0}(?:/{0})*)([^a-zA-Z0-9_\-/.]|$)",
         segment
     );
 
@@ -70,6 +70,7 @@ mod tests {
             suppress_github_mentions("user@example.com"),
             "user@example.com"
         );
+        assert_eq!(suppress_github_mentions("abč@user.com"), "abč@user.com");
 
         // Invalid mentions
         assert_eq!(suppress_github_mentions("@-user"), "@-user");