fix(mobile): close the debug <script> block (batch122 left it open, breaking the keyboard block)

The perf-diagnostics script tag was never closed, so it merged with the following native/keyboard
<script> and threw 'Unexpected token <', disabling the keyboard/safe-area init. Add the missing </script>.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/public/home.html

@@ -1165,6 +1165,7 @@ window.__perfProbe=function(label){ try{
       window.bzDbg('slidePerf',{label:label||'', frames:frames.length, maxGapMs:max, jankFrames:over, longtasks:longtasks, gaps:frames.slice(0,40)}); }
   })(last);
 }catch(e){} };
+</script>
 <script>
 // Native shell tag (iOS/Android). Safe-area insets are handled natively by the @capacitor-community/
 // safe-area plugin (it makes env(safe-area-inset-*) report real values), so there's no JS status-bar