fix(happy-app): web chat scroll direction inverted

packages/happy-app/sources/components/ChatList.web.tsx

@@ -0,0 +1,60 @@
+import * as React from 'react';
+import { useSession, useSessionMessages } from '@/sync/storage';
+import { View } from 'react-native';
+import { useHeaderHeight } from '@/utils/responsive';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
+import { MessageView } from './MessageView';
+import { Metadata, Session } from '@/sync/storageTypes';
+import { ChatFooter } from './ChatFooter';
+import { Message } from '@/sync/typesMessage';
+
+export const ChatList = React.memo((props: { session: Session }) => {
+    const { messages } = useSessionMessages(props.session.id);
+    return (
+        <ChatListInternal
+            metadata={props.session.metadata}
+            sessionId={props.session.id}
+            messages={messages}
+        />
+    );
+});
+
+const ChatListInternal = React.memo((props: {
+    metadata: Metadata | null;
+    sessionId: string;
+    messages: Message[];
+}) => {
+    const headerHeight = useHeaderHeight();
+    const safeArea = useSafeAreaInsets();
+    const session = useSession(props.sessionId)!;
+
+    // flex-direction: column-reverse gives us native browser reversed scroll
+    // without scaleY(-1), so middle-click auto-scroll and wheel work correctly.
+    // Messages are already newest-first from the store, which matches column-reverse order.
+    return (
+        <div
+            style={{
+                display: 'flex',
+                flexDirection: 'column-reverse',
+                overflowY: 'auto',
+                overflowX: 'hidden',
+                height: '100%',
+                WebkitOverflowScrolling: 'touch',
+                scrollbarWidth: 'thin',
+            }}
+        >
+            {/* In column-reverse, first DOM element = visual bottom */}
+            <ChatFooter controlledByUser={session.agentState?.controlledByUser || false} />
+            {props.messages.map((message) => (
+                <MessageView
+                    key={message.id}
+                    message={message}
+                    metadata={props.metadata}
+                    sessionId={props.sessionId}
+                />
+            ))}
+            {/* Top spacer for header — last in DOM = visual top */}
+            <View style={{ flexDirection: 'row', alignItems: 'center', height: headerHeight + safeArea.top + 32 }} />
+        </div>
+    );
+});