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>

WsClient.pas

@@ -145,6 +145,9 @@ begin
       P      := @Data;
       Result := SendRaw(P^, Len);
     end;
+    // Ошибка отправки (таймаут SO_SNDTIMEO, разрыв) — немедленно закрываем
+    // клиент чтобы BroadcastBinary не держал FClientLock на следующих тиках.
+    if not Result then FState := wsClosed;
   finally
     FLock.Leave;
   end;