chore(build): rebuild frontend with the Remove-frame button + Mercure delete sentinel

The previous "Remove this frame" feature commit shipped the source but
not the built assets, so the deployed bundle still showed the old
settings sheet. Rebuilds public/build/.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

public/build/index.html

@@ -14,7 +14,7 @@
     <meta name="mobile-web-app-capable" content="yes" />
     <meta name="apple-mobile-web-app-status-bar-style" content="default" />
     <meta name="apple-mobile-web-app-title" content="pictureFrame" />
-    <script type="module" crossorigin src="/build/assets/index-CpQ3ngDB.js"></script>
+    <script type="module" crossorigin src="/build/assets/index-CcUL8REP.js"></script>
     <link rel="modulepreload" crossorigin href="/build/assets/_plugin-vue_export-helper-DRLwVS0w.js">
     <link rel="stylesheet" crossorigin href="/build/assets/index-BlLBHR1q.css">
   </head>