Avoid external favicon fetches

Render letter badges instead of fetching favicons to prevent noisy 404 errors from Google favicon endpoints.

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

script.js

@@ -131,11 +131,6 @@
     }
   }
 
-  function faviconUrl(url) {
-    const domainUrl = encodeURIComponent(url);
-    return `https://www.google.com/s2/favicons?domain_url=${domainUrl}&sz=64`;
-  }
-
   function escapeHtml(s) {
     return String(s)
       .replaceAll("&", "&")
@@ -272,7 +267,7 @@
         <div class="card-head">
           <div class="card-title">
             <div class="favicon" aria-hidden="true">
-              <img src="${faviconUrl(link.url)}" alt="" onerror="this.remove(); this.parentNode.insertAdjacentHTML('beforeend','<div class=&quot;letter&quot;>${letter}</div>');" />
+              <div class="letter">${letter}</div>
             </div>
             <div class="title-wrap">
               <div class="title" title="${title}">${title}</div>