[Gab] feat: add new bridge GabBridge (#2920)

lib/html.php

@@ -50,6 +50,15 @@ function raw(string $s): string
     return $s;
 }
 
+function truncate(string $s, int $length = 150, $marker = '...'): string
+{
+    $s = trim($s);
+    if (mb_strlen($s) <= $length) {
+        return $s;
+    }
+    return mb_substr($s, 0, $length) . $marker;
+}
+
 /**
  * Removes unwanted tags from a given HTML text.
  *