Add device diagnostics and P2P access controls

frontend/p2p-client.js

@@ -224,6 +224,7 @@
       let m;
       try { m = JSON.parse(e.data); } catch { return; }
       if (m.type === 'hello') { myPeer = m.peer; wsRetry = 0; }
+      if (m.type === 'force-sync') sync();
       emit(m);
     };
     sock.onclose = () => {