fix: show live connection indicator on mobile

The header's live/connecting status was hidden below the 860px
breakpoint; keep it visible on mobile too.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/globals.css

@@ -169,7 +169,4 @@ body {
     grid-column: 1 / -1 !important;
     grid-row: auto !important;
   }
-  .pn-live-label {
-    display: none !important;
-  }
 }