✨ feat(vscode): 代码阅读对话记录加「复制回答」按钮

历史每条在删除左边、答完的当前这一轮在头部右边，点了把回答原样的 Markdown（带仓库链接、不带问题）放进剪贴板，成功图标换成对勾、提示「已复制」，失败提示「复制失败」，两秒后复原；复制文字并给反馈抽成 useCopyText 一份，日志弹窗也改用它，复制失败不再静默吞掉；两个头部按钮共用 cr-qa-action 样式

vscode/webview-ui/src/codeReader/AskThread.tsx

@@ -3,10 +3,12 @@ import type { ClipboardEvent, DragEvent, KeyboardEvent, ReactElement } from 'rea
 import type { Ask } from './qa'
 import type { PendingImage } from './qaImages'
 import type { ProfileChoice, QaEntryView } from './types'
-import { ChevronDown, ChevronRight, CircleStop, Hourglass, LoaderCircle, MessageSquareText, Search, SendHorizontal, Sparkles, Trash2, TriangleAlert, X } from 'lucide-react'
+import type { CopyState } from '@/hooks/useCopyText'
+import { Check, ChevronDown, ChevronRight, CircleStop, Copy, Hourglass, LoaderCircle, MessageSquareText, Search, SendHorizontal, Sparkles, Trash2, TriangleAlert, X } from 'lucide-react'
 import { useEffect, useRef, useState } from 'react'
 import { createPortal } from 'react-dom'
 import { SelectMenu } from '@/components/ui/select-menu'
+import { useCopyText } from '@/hooks/useCopyText'
 import { renderMarkdown, renderMarkdownOnce } from './markdown'
 import { answerPreview, relativeTime, unfinished } from './qa'
 import { MAX_IMAGES, pickImages, readImage, transferFiles } from './qaImages'
@@ -109,8 +111,26 @@ function ImagePreview({ url, onClose }: { url: string, onClose: () => void }): R
   )
 }
 
+/** 复制按钮在每种复制结果下的图标和名字。 */
+const COPY_LOOKS: Record<CopyState, { icon: LucideIcon, label: string }> = {
+  idle: { icon: Copy, label: '复制回答' },
+  copied: { icon: Check, label: '已复制' },
+  failed: { icon: TriangleAlert, label: '复制失败' },
+}
+
+/** 头部右边的「复制回答」：把 `answer` 原样的 Markdown 连同里面的仓库链接放进剪贴板，好拿到别的会话里接着用；点完图标和名字换成复制的结果，两秒后复原。 */
+function CopyAnswerButton({ answer }: { answer: string }): ReactElement {
+  const { state, copy } = useCopyText()
+  const { icon: Icon, label } = COPY_LOOKS[state]
+  return (
+    <button type="button" className="cr-tool cr-qa-action" data-failed={state === 'failed' ? '' : undefined} data-tooltip={label} aria-label={label} onClick={() => void copy(answer)}>
+      <Icon size={13} strokeWidth={1.8} aria-hidden />
+    </button>
+  )
+}
+
 /**
- * 说过的一次，灰字：说的话、时间、删除（问答叫「已理解，删除」），带的图片，下面回答的前两行；点问题或预览展开整段回答（照样灰字，按 Markdown 排）。
+ * 说过的一次，灰字：说的话、时间、复制回答、删除（问答叫「已理解，删除」），带的图片，下面回答的前两行；点问题或预览展开整段回答（照样灰字，按 Markdown 排）。
  * 重写记录没写进文件时，最下面写着原因
  */
 function HistoryItem({ entry, wording, now, onDelete, onOpenImage }: { entry: QaEntryView, wording: ThreadWording, now: number, onDelete: () => void, onOpenImage: (url: string) => void }): ReactElement {
@@ -130,7 +150,8 @@ function HistoryItem({ entry, wording, now, onDelete, onOpenImage }: { entry: Qa
           </time>
           {entry.profile && <span data-tooltip="用这个 Claude Code 配置（profile）答的">{` · ${entry.profile}`}</span>}
         </span>
-        <button type="button" className="cr-tool cr-qa-delete" data-tooltip={wording.deleteLabel} aria-label={wording.deleteLabel} onClick={onDelete}>
+        <CopyAnswerButton answer={entry.answer} />
+        <button type="button" className="cr-tool cr-qa-action" data-tooltip={wording.deleteLabel} aria-label={wording.deleteLabel} onClick={onDelete}>
           <Trash2 size={13} strokeWidth={1.8} aria-hidden />
         </button>
       </div>
@@ -152,7 +173,7 @@ function HistoryItem({ entry, wording, now, onDelete, onOpenImage }: { entry: Qa
   )
 }
 
-/** 当前这一轮说的一次，照常颜色：说的话，回答逐字长出来（按 Markdown 排），排着队、在做的事、出错（重写注释没写进文件也算）、停止写在下面 */
+/** 当前这一轮说的一次，照常颜色：说的话（答完了右边能复制回答），回答逐字长出来（按 Markdown 排），排着队、在做的事、出错（重写注释没写进文件也算）、停止写在下面 */
 function CurrentItem({ ask, wording, onOpenImage }: { ask: Ask, wording: ThreadWording, onOpenImage: (url: string) => void }): ReactElement {
   const running = ask.status === 'running'
   const label = ask.activity ?? (ask.text === '' ? '正在想…' : wording.answering)
@@ -162,6 +183,7 @@ function CurrentItem({ ask, wording, onOpenImage }: { ask: Ask, wording: ThreadW
       <div className="cr-qa-head">
         <Icon size={12} strokeWidth={1.8} className="cr-qa-icon" aria-hidden />
         <span className="cr-qa-question">{ask.question}</span>
+        {!unfinished(ask) && ask.text !== '' && <CopyAnswerButton answer={ask.text} />}
       </div>
       <Thumbs urls={ask.images ?? []} onOpen={onOpenImage} />
       {ask.text !== '' && (