Fix position fixed causing layout shifts on standalone sites (pwa) (#277)

Author: Cuzart

src/use-position-fixed.ts

@@ -96,7 +96,9 @@ export function usePositionFixed({
     if (nested || !hasBeenOpened) return;
     // This is needed to force Safari toolbar to show **before** the drawer starts animating to prevent a gnarly shift from happening
     if (isOpen) {
-      setPositionFixed();
+      // avoid for standalone mode (PWA)
+      const isStandalone = window.matchMedia('(display-mode: standalone)').matches;
+      !isStandalone && setPositionFixed();
 
       if (!modal) {
         setTimeout(() => {