swipe bug fix

frontend/src/components/ImageLightbox.jsx

@@ -4,15 +4,16 @@ import { createPortal } from 'react-dom';
 export default function ImageLightbox({ src, onClose }) {
   const overlayRef = useRef(null);
 
-  // Close on Escape
+  // Close on Escape; signal global pinch handler to stand down while open
   useEffect(() => {
     const handler = (e) => { if (e.key === 'Escape') onClose(); };
     window.addEventListener('keydown', handler);
-    // Prevent body scroll while open
     document.body.style.overflow = 'hidden';
+    document.documentElement.dataset.lightboxOpen = '1';
     return () => {
       window.removeEventListener('keydown', handler);
       document.body.style.overflow = '';
+      delete document.documentElement.dataset.lightboxOpen;
     };
   }, [onClose]);
 

frontend/src/main.jsx

@@ -59,7 +59,9 @@ if ('serviceWorker' in navigator) {
 
   document.addEventListener('touchmove', function (e) {
     if (e.touches.length === 2 && pinchStartDist !== null) {
-      // Two-finger pinch: scale fonts, not viewport
+      // Two-finger pinch: scale fonts, not viewport.
+      // Skip when a lightbox is open — let the browser handle pinch natively there.
+      if (document.documentElement.dataset.lightboxOpen) return;
       e.preventDefault();
       const ratio = getTouchDist(e) / pinchStartDist;
       const newScale = Math.min(MAX_SCALE, Math.max(MIN_SCALE, pinchStartScale * ratio));

frontend/src/pages/Chat.jsx

@@ -455,11 +455,15 @@ export default function Chat() {
     setUnreadGroups(prev => { const next = new Map(prev); next.delete(id); return next; });
   };
 
-  // Establish one history sentinel on mount (mobile only) so back gestures are
+  // Establish two history entries on mount (mobile only):
-  // always interceptable without accumulating extra entries.
+  //   floor   — marks the true exit point; always stays below the sentinel
+  //   sentinel — intercepted by handlePopState on every back gesture
+  // Two entries are required so that iOS fires popstate (same-document navigation)
+  // before exiting, giving the handler a chance to push a new sentinel.
   useEffect(() => {
     if (window.innerWidth < 768) {
-      window.history.replaceState({ rc: 'chat' }, '');
+      window.history.replaceState({ rc: 'floor' }, '');
+      window.history.pushState({ rc: 'chat' }, '');
     }
   }, []);
 
@@ -486,8 +490,11 @@ export default function Chat() {
         return;
       }
 
-      // Already at root (Messages list, no chat open) — let the browser handle
+      // Already at root (Messages list, no chat open) — we just popped the sentinel
-      // it so the next gesture actually exits the PWA. Don't re-push.
+      // and are now on the floor entry. Step one more back so the browser exits the
+      // PWA (or navigates to the previous URL). Without this explicit go(-1), iOS
+      // leaves the user stranded on the invisible floor state.
+      window.history.go(-1);
     };
     window.addEventListener('popstate', handlePopState);
     return () => window.removeEventListener('popstate', handlePopState);