fix: live preview divider disappears when live preview width is very narrow

Author: devvaannsh

src/extensionsIntegrated/Phoenix-live-preview/panel.html

@@ -62,7 +62,7 @@
         <i class="fa fa-times live-preview-overlay-close" title="{{Strings.LIVE_PREVIEW_HIDE_OVERLAY}}"></i>
     </div>
     <div class="frame-container">
-        <div style="width: 3px;"></div>
+        <div style="width: 3px; flex-shrink: 0;"></div>
         <iframe id="panel-live-preview-frame" title="Live Preview" style="border: none"
                 width="100%" height="100%" seamless="true" srcdoc='<img width="50px" src="styles/images/Spinner-1s-200px.svg">'
                 sandbox="allow-same-origin allow-popups-to-escape-sandbox allow-popups allow-scripts allow-forms allow-modals allow-pointer-lock">