Fix pause button: resend visibility on page load

The pause button wasn't appearing because preload.js variables were being
reset when pages reloaded/navigated, but the visibility message was only
sent once in attachView().

Now sends pause-button-visibility on EVERY page load (did-finish-load event)
to ensure the button state persists across page reloads and navigation.

install_kiosk_0.9.2.sh

@@ -4202,6 +4202,12 @@ function createWindow(){
           },true);
         });
       `).catch(()=>{});
+
+      // Send pause button visibility on every page load to handle reloads
+      const siteDuration=parseInt(t.duration)||0;
+      const shouldShow=siteDuration>0;
+      view.webContents.send('pause-button-visibility',shouldShow);
+      console.log('[MAIN] Page loaded - resending pause-button-visibility: '+shouldShow+' for '+t.url);
     });
     
     const isHidden=parseInt(t.duration)===-1;