✨ feat(vscode): 头脑风暴会话可清除，悬停提示改窄改紧凑

工单记着的头脑风暴会话 id 此前没有清除入口，续聊只能 resume 旧会话，
把几个版本前的提示词和它当时报的错一起带回来。会话 id 行新增清除按钮，
确认后把 state JSON 的 sessionId 置空，下次续聊新开会话；会话文件不动，
手上有 id 仍可 claude --resume 找回。

悬停气泡此前贴着视口右边测量尺寸：fixed 元素的可用宽度是「视口宽 - left」，
贴边测会被挤窄、行数变多，按那个高度定位就浮高一截。改成先在左上角量再落位，
字号行高收紧，提示文案压成一行。顺带修掉「重置为待办」的错误说明——它会停
会话、删 worktree 和未合并 PR，不是原样保留。

Claude-Session: https://claude.ai/code/session_01REdhpbaNyqWASF2HWsnTFv

vscode/webview-ui/src/components/BottomTabs.tsx

@@ -45,6 +45,7 @@ interface BottomTabsProps {
   onResetToTodo: (issueNumber: number) => void
   onCloseSessionTab: (issueNumber: number, kind: 'brainstorm' | 'implement' | 'review' | 'test') => void
   onContinueBrainstorm: (issueNumber: number) => void
+  onClearBrainstormSession: (issueNumber: number) => void
   onUpdateAutoReview: (issueNumber: number, value: boolean) => void
   onUpdateProfilePath: (issueNumber: number, profilePath: string) => void
   onUpdateBrainstormProfilePath: (issueNumber: number, brainstormProfilePath: string) => void
@@ -142,6 +143,7 @@ export function BottomTabs(props: BottomTabsProps) {
             onResetToTodo={props.onResetToTodo}
             onCloseSessionTab={props.onCloseSessionTab}
             onContinueBrainstorm={props.onContinueBrainstorm}
+            onClearBrainstormSession={props.onClearBrainstormSession}
             onUpdateAutoReview={props.onUpdateAutoReview}
             onUpdateProfilePath={props.onUpdateProfilePath}
             onUpdateBrainstormProfilePath={props.onUpdateBrainstormProfilePath}

vscode/webview-ui/src/components/IssueDetailPanel.tsx

@@ -1,7 +1,7 @@
 import type { ClaudeProfile } from '../hooks/useIssues'
 import type { Issue, IssueColumn } from '../types'
 import type { PropertyGroup, RowAction } from './property-grid'
-import { ArrowRightLeft, CircleSlash, Download, ExternalLink, GitMerge, Loader2, Play, RotateCcw, Terminal, Trash2, X } from 'lucide-react'
+import { ArrowRightLeft, CircleSlash, Download, Eraser, ExternalLink, GitMerge, Loader2, Play, RotateCcw, Terminal, Trash2, X } from 'lucide-react'
 import { useMemo, useRef } from 'react'
 import { isIssueLocked } from '../lib/dependencies'
 import { isIssueMine, issueOwnerLogin } from '../lib/issueOwnership'
@@ -93,6 +93,7 @@ interface IssueDetailPanelProps {
    * 打进去，关了就 `claude --resume <id>` 带着提示词恢复，没会话就新开一个。
    */
   onContinueBrainstorm: (issueNumber: number) => void
+  onClearBrainstormSession: (issueNumber: number) => void
   /** Persist a per-issue `autoReview` override into the state JSON. */
   onUpdateAutoReview: (issueNumber: number, value: boolean) => void
   /** 已知 Claude profile 列表，用于「配置文件」下拉选项。 */
@@ -144,6 +145,7 @@ export function IssueDetailPanel({
   onResetToTodo,
   onCloseSessionTab,
   onContinueBrainstorm,
+  onClearBrainstormSession,
   onUpdateAutoReview,
   profiles,
   onUpdateProfilePath,
@@ -236,6 +238,16 @@ export function IssueDetailPanel({
                 },
               })
             }
+            if (hasSession) {
+              secondaryActions.push({
+                icon: <Eraser className="size-3.5" />,
+                title: '清除会话：下次续聊新开一个，不再带旧会话的历史',
+                onClick: () => {
+                  if (issue)
+                    onClearBrainstormSession(issue.number)
+                },
+              })
+            }
             return {
               key: 'sessionId',
               label: '头脑风暴会话id',
@@ -523,7 +535,7 @@ export function IssueDetailPanel({
         ],
       },
     ],
-    [onResumeSession, onResumeReviewSession, onResumeTestSession, onStartTestSession, onOpenFile, onImplement, onOpenPr, onGeneratePrDiffSummary, onOpenWorktree, onDeleteWorktree, onMergeBranch, onCloseSessionTab, onContinueBrainstorm, onOpenLogs, issue, locked, lockTitle, globalAutoReview, prDiffSummaryRunning, profiles],
+    [onResumeSession, onResumeReviewSession, onResumeTestSession, onStartTestSession, onOpenFile, onImplement, onOpenPr, onGeneratePrDiffSummary, onOpenWorktree, onDeleteWorktree, onMergeBranch, onCloseSessionTab, onContinueBrainstorm, onClearBrainstormSession, onOpenLogs, issue, locked, lockTitle, globalAutoReview, prDiffSummaryRunning, profiles],
   )
 
   // 同事的工单只读：属性表统一消毒，顶部只留查看类按钮。
@@ -617,7 +629,7 @@ export function IssueDetailPanel({
               </span>
             )
           : null}
-        <Tooltip label={issue.source === 'youtrack' ? '在浏览器里打开这张 YouTrack 卡' : '在浏览器里打开这个 Gitea 工单'}>
+        <Tooltip label="在浏览器里打开">
           <button
             type="button"
             onClick={() => onOpenInBrowser(issue.htmlUrl)}
@@ -632,7 +644,7 @@ export function IssueDetailPanel({
         {issue.source !== 'youtrack' && !readOnly && (
           <>
             {issue.handoffAttachmentId && me !== undefined && (issue.assignees ?? []).includes(me) && (
-              <Tooltip label={`接管 ${issue.handoffFrom ?? '?'} 移交过来的工单：拉回会话记录和 worktree`}>
+              <Tooltip label={`接管 ${issue.handoffFrom ?? '?'} 的移交`}>
                 <button
                   type="button"
                   disabled={isHandoffRunning(issue.number)}
@@ -646,7 +658,7 @@ export function IssueDetailPanel({
               </Tooltip>
             )}
             {!issue.handoffAttachmentId && issue.column !== 'done' && ((issue.assignees ?? []).length === 0 || (me !== undefined && (issue.assignees ?? []).includes(me))) && (
-              <Tooltip label="移交给同事：把会话记录打包传过去，对方接管后继续做">
+              <Tooltip label="移交给同事">
                 <button
                   type="button"
                   disabled={isHandoffRunning(issue.number)}
@@ -659,14 +671,14 @@ export function IssueDetailPanel({
               </Tooltip>
             )}
             {issue.handoffAttachmentId && !(me !== undefined && (issue.assignees ?? []).includes(me)) && (
-              <Tooltip label={`${issue.handoffFrom ?? '?'} 已移交，等待 ${(issue.assignees ?? []).join(', ') || '?'} 接管`}>
+              <Tooltip label={`${issue.handoffFrom ?? '?'} 已移交，等 ${(issue.assignees ?? []).join(', ') || '?'} 接管`}>
                 <span className="inline-flex shrink-0 items-center rounded border border-[var(--vscode-panel-border)] px-1.5 py-0.5 text-[10px] opacity-70">
                   待接管
                 </span>
               </Tooltip>
             )}
             {(issue.column === 'in-progress' || issue.column === 'review') && (
-              <Tooltip label="打回待办：卡片挪回待办列，会话和 worktree 不动">
+              <Tooltip label="重置为待办（停会话、删 worktree 和未合并 PR）">
                 <button
                   type="button"
                   onClick={() => onResetToTodo(issue.number)}
@@ -677,7 +689,7 @@ export function IssueDetailPanel({
                 </button>
               </Tooltip>
             )}
-            <Tooltip label="关闭工单：Gitea 上置为 closed，卡片从看板消失，可在 Gitea 里重开">
+            <Tooltip label="关闭工单（Gitea 里可重开）">
               <button
                 type="button"
                 onClick={() => onCloseIssue(issue.number)}
@@ -687,7 +699,7 @@ export function IssueDetailPanel({
                 <CircleSlash className="size-3.5" />
               </button>
             </Tooltip>
-            <Tooltip label="删除工单：从 Gitea 彻底删掉，不可撤销">
+            <Tooltip label="删除工单（不可撤销）">
               <button
                 type="button"
                 onClick={() => issue && onDeleteIssue?.(issue.number)}

vscode/webview-ui/src/components/ui/tooltip.tsx

@@ -25,14 +25,14 @@ interface TooltipProps {
  * 上方放不下就翻到下方，左右钳在视口内。
  */
 export function Tooltip({ label, children, className }: TooltipProps): ReactElement {
-  const [pos, setPos] = useState<{ top: number, left: number } | null>(null)
+  const [visible, setVisible] = useState(false)
   const wrapRef = useRef<HTMLSpanElement | null>(null)
   const bubbleRef = useRef<HTMLDivElement | null>(null)
   const timerRef = useRef<ReturnType<typeof setTimeout> | undefined>(undefined)
 
   const hide = useCallback((): void => {
     clearTimeout(timerRef.current)
-    setPos(null)
+    setVisible(false)
   }, [])
 
   const show = useCallback((): void => {
@@ -40,18 +40,17 @@ export function Tooltip({ label, children, className }: TooltipProps): ReactElem
       return
     clearTimeout(timerRef.current)
     timerRef.current = setTimeout(() => {
-      const rect = wrapRef.current?.getBoundingClientRect()
-      if (rect)
-        setPos({ top: rect.top, left: rect.left + rect.width / 2 })
+      if (wrapRef.current)
+        setVisible(true)
     }, SHOW_DELAY_MS)
   }, [label])
 
   useEffect(() => () => clearTimeout(timerRef.current), [])
 
-  // 气泡渲染后才知道自身尺寸，这时才能定最终位置：默认在上方，
-  // 上方空间不够就翻到触发元素下方；水平居中后钳进视口。
+  // 气泡先在左上角量一次尺寸再落位。必须量在 left:0：fixed 元素的可用宽度是
+  // 「视口宽 - left」，贴右边量会被挤窄、行数变多，按那个高度定位就会浮高一截。
   useEffect(() => {
-    if (!pos)
+    if (!visible)
       return
     const bubble = bubbleRef.current
     const rect = wrapRef.current?.getBoundingClientRect()
@@ -65,7 +64,7 @@ export function Tooltip({ label, children, className }: TooltipProps): ReactElem
     bubble.style.top = `${top}px`
     bubble.style.left = `${left}px`
     bubble.style.visibility = 'visible'
-  }, [pos])
+  }, [visible])
 
   return (
     <>
@@ -80,12 +79,12 @@ export function Tooltip({ label, children, className }: TooltipProps): ReactElem
       >
         {children}
       </span>
-      {pos && label && createPortal(
+      {visible && label && createPortal(
         <div
           ref={bubbleRef}
           role="tooltip"
-          style={{ top: pos.top, left: pos.left, visibility: 'hidden' }}
-          className="pointer-events-none fixed z-50 max-w-64 rounded border border-[var(--vscode-editorHoverWidget-border,var(--vscode-panel-border))] bg-[var(--vscode-editorHoverWidget-background,var(--vscode-editorWidget-background))] px-2 py-1 text-xs leading-snug text-[var(--vscode-editorHoverWidget-foreground,var(--vscode-foreground))] shadow-md"
+          style={{ top: 0, left: 0, visibility: 'hidden' }}
+          className="pointer-events-none fixed z-50 max-w-[22rem] rounded border border-[var(--vscode-editorHoverWidget-border,var(--vscode-panel-border))] bg-[var(--vscode-editorHoverWidget-background,var(--vscode-editorWidget-background))] px-2 py-1 text-[11px] leading-tight break-words text-[var(--vscode-editorHoverWidget-foreground,var(--vscode-foreground))] shadow-md"
         >
           {label}
         </div>,