v0.5.1 fixed mobile PWA refesh

frontend/src/main.jsx

@@ -17,6 +17,28 @@ if ('serviceWorker' in navigator) {
 }
 
 
+
+// Disable pull-to-refresh in PWA standalone mode to prevent viewport shift bug.
+// The CSS overscroll-behavior-y:none handles most browsers; this catches the rest.
+(function () {
+  const isStandalone = window.matchMedia('(display-mode: standalone)').matches
+    || window.navigator.standalone === true;
+  if (!isStandalone) return;
+
+  let startY = 0;
+  document.addEventListener('touchstart', e => {
+    startY = e.touches[0].clientY;
+  }, { passive: true });
+
+  document.addEventListener('touchmove', e => {
+    // Only block downward pull at the very top of the document
+    const dy = e.touches[0].clientY - startY;
+    if (dy > 0 && (document.documentElement.scrollTop === 0 || document.body.scrollTop === 0)) {
+      e.preventDefault();
+    }
+  }, { passive: false });
+})();
+
 // Clear badge count when user focuses the app
 window.addEventListener('focus', () => {
   if (navigator.clearAppBadge) navigator.clearAppBadge().catch(() => {});