fix WebSocket deadlock on slow client + mobile TX controls visibility

Deadlock: BroadcastBinary held FClientLock during blocking SockSend;
slow/stalled client caused Stop() to wait forever. Fix: set SO_SNDTIMEO=1s
on each accepted socket so SockSend returns error instead of hanging,
mark client wsClosed on send failure so subsequent ticks skip it.

Mobile: move TONE/TX-slider/MOX to front of toolbar via CSS order so
they are immediately visible without horizontal scroll on phones.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

WebServer.pas

@@ -588,6 +588,9 @@ begin
       SockClose(CSock);
       Continue;
     end;
+    // 1 секунда на отправку: если TCP-буфер клиента переполнен, SockSend
+    // вернёт ошибку вместо того чтобы висеть и держать FClientLock вечно.
+    SockSetSndTimeout(CSock, 1000);
     Client := TWsClient.Create(CSock);
     FClientLock.Enter;
     try