fix(client): address tool presentation review

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

@@ -81,7 +81,7 @@ export const AssistantMarkdown = memo(function AssistantMarkdown({
             case 'text': return (
               <MarkdownText key={i} text={block.text} streaming={streaming} codeLabels={codeLabels} />
             )
-            case 'reasoning': return <ReasoningRow key={i} text={block.text} running={streaming && i === last} />
+            case 'reasoning': return <ReasoningRow key={i} text={block.text} running={streaming && i === last} t={t} />
             // Grouped into tool rows by ChatView; hasVisible above skips an empty shell.
             case 'tool-call': return null
             default: return (

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

@@ -7,6 +7,7 @@
 import { useState, type ReactNode } from 'react'
 import type { ChatViewSlotProps, CommandRowOwnerProps } from '../contract/slots.ts'
 import { DisclosureRow, IconApiOutline14, StateDot } from '@deepseek-ai/dsh-client-ui-primitives'
+import a11yCss from './accessibility.module.css'
 import css from './GenericCommandCard.module.css'
 
 type CommandRowState = 'running' | 'ok' | 'error'
@@ -42,6 +43,7 @@ export function GenericCommandCard({ node, t }: GenericCommandCardProps) {
   const open = expanded && body !== null
   return (
     <div className={css.root} data-state={state}>
+      {state === 'error' && <span className={a11yCss.visuallyHidden}>{t('row.failed')}</span>}
       <DisclosureRow
         rowClassName={css.row}
         leadingClassName={css.leading}

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

@@ -1,7 +1,9 @@
 /** Assistant reasoning disclosure, independent of Tool-call presentation. */
 import { useEffect, useRef, useState } from 'react'
 import { DisclosureRow, IconThinkOutline14 } from '@deepseek-ai/dsh-client-ui-primitives'
+import type { ChatViewSlotProps } from '../contract/slots.ts'
 import { useThrottledVisualUpdate } from './use-throttled-visual-update.ts'
+import a11yCss from './accessibility.module.css'
 import css from './ReasoningRow.module.css'
 
 function firstLine(text: string): string {
@@ -19,9 +21,10 @@ function latestLine(text: string): string {
  * Render one assistant reasoning block as the Think disclosure row.
  * @param props.text - complete or streaming reasoning text.
  * @param props.running - whether this block is the streaming tail.
+ * @param props.t - conversation locale seat for the running status.
  * @returns the reasoning disclosure.
  */
-export function ReasoningRow({ text, running }: { text: string; running: boolean }) {
+export function ReasoningRow({ text, running, t }: { text: string; running: boolean; t: ChatViewSlotProps['t'] }) {
   const [expanded, setExpanded] = useState(false)
   const summaryRef = useRef<HTMLSpanElement>(null)
   const summary = running ? latestLine(text) : firstLine(text)
@@ -36,6 +39,7 @@ export function ReasoningRow({ text, running }: { text: string; running: boolean
 
   return (
     <div className={css.root} data-state={running ? 'running' : 'ok'}>
+      {running && <span className={a11yCss.visuallyHidden}>{t('row.running')}</span>}
       <DisclosureRow
         rowClassName={css.row}
         leadingClassName={css.leading}

packages/client/ui-conversation/src/client/chat/accessibility.module.css

@@ -0,0 +1,8 @@
+.visuallyHidden {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  overflow: hidden;
+  clip: rect(0 0 0 0);
+  white-space: nowrap;
+}

packages/client/ui-conversation/src/client/contract/slots.ts

@@ -33,6 +33,8 @@ declare module '@deepseek-ai/dsh-client-ui-slots' {
     /**
      * One root Tool call at its ordered ChatFlow position. The chat view owns
      * placement; ui-tool owns root/subcall composition and keyed dispatch.
+     * The filler preserves the call-anchor DOM contract documented by
+     * {@link ToolTreeOwnerProps} for every root and child wrapper.
      */
     'conversation.chat.tool': { kind: 'single'; scope: 'session'; owner: ToolTreeOwnerProps }
     /**
@@ -176,7 +178,12 @@ export interface TurnTailOwnerProps {
   openFile: (path: string) => void
 }
 
-/** Owner currency of the chat view's whole-Tool rendering seat. */
+/**
+ * Owner currency of the chat view's whole-Tool rendering seat. The filler
+ * wraps every rendered root and child with `data-chat-anchor-key="call:<id>"`
+ * and `data-chat-call-id="<id>"`, plus `data-selected="true"` for the selected
+ * call. ChatView consumes those anchors to restore prepend/paging position.
+ */
 export interface ToolTreeOwnerProps {
   /** Root Tool call identity, stable across running → settled. */
   callId: CallId