fix(web): narrow request lifecycle fences

packages/client/ui-conversation/src/client/chat/ChatView.tsx

@@ -231,7 +231,8 @@ export function ChatView({
   const runningCalls = useSession(s => s.runningCalls)
   const codeDispatches = useSession(s => s.codeDispatches)
   const openState = useSession(s => s.openState)
-  const openErrorMessage = useSession(s => s.openError === null ? null : `${s.openError.message}（${s.openError.code}）`)
+  const openError = useSession(s => s.openError)
+  const openErrorMessage = openError === null ? null : `${openError.message}（${openError.code}）`
   const hasMore = useSession(s => s.hasMore)
   const loadingOlder = useSession(s => s.loadingOlder)
   const selectedCallId = useStore(s => s.selection?.callId)
@@ -355,7 +356,12 @@ export function ChatView({
       <div ref={listRef} className={css.scroll} onScroll={onScroll}>
         <div className={css.column}>
           {openState === 'loading' && <div className={css.hint}>载入历史…</div>}
-          {openState === 'error' && <div className={css.openError}>历史加载失败：{openErrorMessage}</div>}
+          {openState === 'error' && openError?.code === 'cancelled' && (
+            <div className={css.hint}>连接已中断，等待重连…</div>
+          )}
+          {openState === 'error' && openError?.code !== 'cancelled' && (
+            <div className={css.openError}>历史加载失败：{openErrorMessage}</div>
+          )}
           {hasMore && (
             <div className={css.older}>
               <button type="button" disabled={loadingOlder} onClick={loadOlderAnchored}>