v0.12.34 iOS bug fixes

frontend/src/main.jsx

@@ -6,8 +6,15 @@ import './index.css';
 // Register service worker
 if ('serviceWorker' in navigator) {
   window.addEventListener('load', () => {
-    navigator.serviceWorker.register('/sw.js')
-      .then(reg => console.log('[SW] Registered, scope:', reg.scope))
+    navigator.serviceWorker.register('/sw.js', { updateViaCache: 'none' })
+      .then(reg => {
+        console.log('[SW] Registered, scope:', reg.scope);
+        // iOS aggressively HTTP-caches sw.js — force a check whenever the app
+        // becomes visible so updates are picked up without a full cold launch.
+        document.addEventListener('visibilitychange', () => {
+          if (document.visibilityState === 'visible') reg.update().catch(() => {});
+        });
+      })
       .catch(err => console.error('[SW] Registration failed:', err));
   });
 }
@@ -107,10 +114,13 @@ if ('serviceWorker' in navigator) {
 // from the message input (the keyboard covers the home indicator area anyway).
 if (window.visualViewport) {
   const onViewportChange = () => {
-    const h = window.visualViewport.height;
-    document.documentElement.style.setProperty('--visual-viewport-height', `${h}px`);
+    const vv = window.visualViewport;
+    document.documentElement.style.setProperty('--visual-viewport-height', `${vv.height}px`);
+    // Expose the visual viewport's vertical offset so .chat-layout can stay
+    // pinned to the visible area even when iOS scrolls the page on keyboard open.
+    document.documentElement.style.setProperty('--visual-viewport-offset', `${vv.offsetTop}px`);
     // window.innerHeight doesn't shrink on iOS when keyboard opens — the gap IS the keyboard.
-    const keyboardVisible = (window.innerHeight - h) > 150;
+    const keyboardVisible = (window.innerHeight - vv.height) > 150;
     document.documentElement.classList.toggle('keyboard-open', keyboardVisible);
   };
   window.visualViewport.addEventListener('resize', onViewportChange);

frontend/src/pages/Chat.css

@@ -64,7 +64,15 @@
 
 @media (max-width: 767px) {
   .chat-layout {
-    position: relative;
+    /* position: fixed keeps the layout pinned to the visual viewport even when
+       iOS scrolls the page on keyboard open. Without this, iOS scrolls the page
+       to bring the focused textarea into view, moving it to the top of the screen.
+       --visual-viewport-offset tracks the visual viewport's scrolled position so
+       the layout follows if iOS shifts it (usually 0, non-zero during keyboard open). */
+    position: fixed;
+    top: var(--visual-viewport-offset, 0px);
+    left: 0;
+    right: 0;
   }
   .chat-body {
     overflow: hidden;