fix: scope mobile share install to dashboard path (#223)

frontend/index.html

@@ -3067,7 +3067,7 @@ textarea { resize: vertical; min-height: 120px; }
     if (workSession.active()) workSession.reconcile();
   });
   if ('serviceWorker' in navigator) {
-    navigator.serviceWorker.register('/service-worker.js').catch(error =>
+    navigator.serviceWorker.register('service-worker.js').catch(error =>
       console.warn('Stackchain install support unavailable', error)
     );
   }