fix: revealRouteBeforeDismissingModal logic on narrow

Author: JakubKorytko

src/libs/Navigation/Navigation.ts

@@ -1008,9 +1008,11 @@ function revealRouteBeforeDismissingModal(route: Route, options?: {afterTransiti
         });
         // Nested rAF: the first frame commits the route insertion, the second
         // frame starts the dismiss. This ensures React processes the two dispatches
-        // in separate renders so the dismiss animation is preserved.
+        // in separate renders so the dismiss animation is preserved. On narrow,
+        // wait for the hidden destination transition first so the RHP slides out
+        // over the final page instead of briefly revealing the previous page.
         requestAnimationFrame(() => {
-            dismissModal({afterTransition: options?.afterTransition});
+            dismissModal({afterTransition: options?.afterTransition, waitForTransition: getIsNarrowLayout()});
         });
     });
 }