diff --git a/src/admin/ui/AppShell.tsx b/src/admin/ui/AppShell.tsx
index f1e7f5a..bdcc533 100644
--- a/src/admin/ui/AppShell.tsx
+++ b/src/admin/ui/AppShell.tsx
@@ -42,10 +42,19 @@ export default function AppShell() {
     set();
     window.addEventListener("resize", set);
     window.visualViewport?.addEventListener("resize", set);
+    // Kill pull-to-refresh: a PTR reload lands mid-viewport-settle and
+    // re-races the measurement (Chromium settles without a resize event).
+    // The immersive page is fixed-viewport — the gesture has no use here.
+    const prevRootOverscroll = root.style.overscrollBehaviorY;
+    const prevBodyOverscroll = document.body.style.overscrollBehaviorY;
+    root.style.overscrollBehaviorY = "none";
+    document.body.style.overscrollBehaviorY = "none";
     return () => {
       window.removeEventListener("resize", set);
       window.visualViewport?.removeEventListener("resize", set);
       root.style.removeProperty("--app-height");
+      root.style.overscrollBehaviorY = prevRootOverscroll;
+      document.body.style.overscrollBehaviorY = prevBodyOverscroll;
     };
   }, [immersiveOnMobile]);