Fix favicon onerror null parent

Capture parent before removing broken favicon image to avoid insertAdjacentHTML on null.

Co-authored-by: Cursor <cursoragent@cursor.com>

script.js

@@ -279,7 +279,7 @@
             <div class="favicon" aria-hidden="true">
               ${
                 fav
-                  ? `<img src="${escapeHtml(fav)}" alt="" loading="lazy" decoding="async" referrerpolicy="no-referrer" onerror="this.remove(); this.parentNode.insertAdjacentHTML('beforeend','<div class=&quot;letter&quot;>${letter}</div>');" />`
+                  ? `<img src="${escapeHtml(fav)}" alt="" loading="lazy" decoding="async" referrerpolicy="no-referrer" onerror="const p=this.parentNode; this.remove(); if(p) p.insertAdjacentHTML('beforeend','<div class=&quot;letter&quot;>${letter}</div>');" />`
                   : `<div class="letter">${letter}</div>`
               }
             </div>