fix(mobile): open the keyboard from the pill in browsers and draft unreleased changelog

The pill's expand focused the textarea from a rAF, outside the user
gesture — mobile browsers only show the soft keyboard for synchronous
focus, so the composer expanded silently. The expand now flushes the
render and focuses in the same gesture, and preventScroll applies only
inside the Capacitor shell so browsers keep their native reveal that
lifts the field above the keyboard (same for the post-overlay keyboard
restore). Also drafts the [Unreleased] changelog entries for everything
since v1.13.9.

packages/ui/src/components/chat/ChatInput.tsx

@@ -1,5 +1,6 @@
 import React from 'react';
 import { flushSync } from 'react-dom';
+import { isCapacitorApp } from '@/lib/platform';
 import { Textarea } from '@/components/ui/textarea';
 import { ComposerDictation } from '@/components/dictation/ComposerDictation';
 // sessionStore removed — currentSessionId comes from useSessionUIStore
@@ -4035,14 +4036,18 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
     // ── Mobile pill composer state machine ─────────────────────────────────
     const expandMobileComposer = React.useCallback((intent: 'focus') => {
         mobileExpandIntentRef.current = intent;
-        setMobileComposerExpanded(true);
-        // Wait a frame so the full composer's textarea mounts.
-        // No re-pin here: the keyboard choreography measures the pending
-        // bottom distance (which includes the pill→full height change) and
-        // folds it into the single keyboard slide.
-        requestAnimationFrame(() => {
-            textareaRef.current?.focus({ preventScroll: true });
+        // flushSync so the textarea exists NOW and focus() still runs inside
+        // the user gesture's call stack: mobile browsers only open the soft
+        // keyboard for focus calls made synchronously from the tap (an rAF
+        // here worked in the Capacitor WebView but not in Safari/Chrome).
+        flushSync(() => {
+            setMobileComposerExpanded(true);
         });
+        // Capacitor: our keyboard choreography positions everything, so the
+        // browser's own scroll-into-view must stay off. Mobile BROWSERS have no
+        // choreography — the native reveal (viewport pan that lifts the focused
+        // field above the keyboard) is the only thing that moves the composer.
+        textareaRef.current?.focus({ preventScroll: isCapacitorApp() });
     }, []);
 
     const handleMobileNewSession = React.useCallback(() => {
@@ -4128,7 +4133,8 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
         // overlay appears.
         const timer = window.setTimeout(() => {
             restoreKeyboardAfterOverlayRef.current = false;
-            textareaRef.current?.focus({ preventScroll: true });
+            // Browsers need their native scroll-into-view (see expandMobileComposer).
+            textareaRef.current?.focus({ preventScroll: isCapacitorApp() });
         }, 180);
         return () => window.clearTimeout(timer);
     }, [isMobile, mobileOverlayOpen, mobileTextareaFocused]);

packages/vscode/CHANGELOG.md

@@ -1,3 +1,7 @@
+## [Unreleased]
+
+- Chat: loading older messages keeps your scroll position steady.
+
 ## [1.13.9] - 2026-07-02
 
 - Agents: clearing optional agent fields now removes them from agent config instead of saving `null` values.