Hide project-only surfaces in scratch conversations

Why: Independent review found the cross-read toggle, the project inbox
scope and the archive-to-project action still reachable from an open
scratch (no-project) conversation.

Evidence: npx vitest run (685 tests) and npx tsc -b --noEmit pass locally
against the UI fix branch (SELF); CI on the PR head is authoritative.

Impact: Scratch conversations hide the cross-read setting, always show
the conversation inbox and omit onArchive; real projects are unchanged.

Refs: Agent-System-UI#60; agent-exec receipt u3e-run (cursor, success)
Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/Conversation.tsx

@@ -637,14 +637,14 @@ function ConversationSession() {
           {profiles.map(p => <option key={p.id} value={p.id}>{p.name}</option>)}
         </select>
         </label>
-        <div className="companion-setting"><span>读取同项目的其他对话</span><button className="btn ghost"
+        {!conversation?.scratch && <div className="companion-setting"><span>读取同项目的其他对话</span><button className="btn ghost"
           title={conversation?.allowCrossRead === false
             ? '本会话不读取其他会话记录（点击开启）'
             : '本会话可读取同项目其他会话记录（需项目设置开启跨会话读取；点击关闭）'}
           onClick={() => currentConvId && store.setCrossFlags(currentConvId, { allowCrossRead: conversation?.allowCrossRead === false })}>
           {conversation?.allowCrossRead === false ? '关闭' : '允许'}
         </button>
-        <span className="companion-setting-note">实际读取范围还需项目设置允许</span></div>
+        <span className="companion-setting-note">实际读取范围还需项目设置允许</span></div>}
         <label className="companion-setting"><span>这次工作的要求</span><SessionNoteField convId={currentConvId} note={conversation?.sessionNote ?? ''} /></label>
         </Collapsible>
         <span title={connected ? '已连接' : '正在重新连接'} className={`conn-dot ${connected ? 'on' : 'off'}`} />

src/components/ConversationWork.tsx

@@ -10,6 +10,7 @@ export function ConversationWork() {
   const cards = useStore(s => s.cards)
   const conversationId = useStore(s => s.currentConvId)
   const projectId = useStore(s => s.currentProjectId)
+  const scratch = useStore(s => !!s.tasks.find(t => t.id === s.currentConvId)?.scratch)
   const messages = useStore(s => s.messages)
   const actionStates = useStore(s => s.cardActionStates)
   const rightCollapsed = useStore(s => s.ui.rightCollapsed)
@@ -56,7 +57,7 @@ export function ConversationWork() {
     onPin: (card: ActivityCard, pinned: boolean) => { void store.cardPin(card, pinned) },
     onDismiss: (card: ActivityCard) => { void store.cardDismiss(card) },
     onLocate: (card: ActivityCard) => { store.locateMessage(card.anchorMessageId) },
-    onArchive: (card: ActivityCard) => { void store.cardToProject(card) },
+    ...(scratch ? {} : { onArchive: (card: ActivityCard) => { void store.cardToProject(card) } }),
   }
   const view = (card: ActivityCard) => <ActivityCardView key={card.id} card={card} callbacks={callbacks} docBridge={docBridge} />
 

src/components/Workbench.tsx

@@ -22,7 +22,8 @@ export const docBridge: DocBridge = {
   },
 }
 
-const inboxCallbacks = {
+// 无项目对话（scratch）没有可留档的项目：只用不含 onArchive 的回调。
+const scratchInboxCallbacks = {
   onAction: (c: ActivityCard, id: string, payload?: WorkCardAction) => store.cardAction(c, id, payload),
   onOpenRecord: (c: ActivityCard) => store.openWorkRecord(c),
   onReference: (c: ActivityCard) => store.referenceWork(c),
@@ -30,8 +31,8 @@ const inboxCallbacks = {
   onPin: (c: ActivityCard, p: boolean) => store.cardPin(c, p),
   onDismiss: (c: ActivityCard) => store.cardDismiss(c),
   onLocate: (c: ActivityCard) => store.locateMessage(c.anchorMessageId),
-  onArchive: (c: ActivityCard) => store.cardToProject(c),
 }
+const inboxCallbacks = { ...scratchInboxCallbacks, onArchive: (c: ActivityCard) => store.cardToProject(c) }
 
 /** 项目收件箱视图（CF3/D49/D51）：项目级卡片 ∪ 其他会话待办（done 不聚合）。 */
 function ProjectInbox({ cards, filter }: { cards: ActivityCard[]; filter: InboxFilter }) {
@@ -63,7 +64,9 @@ export function Workbench() {
   const cards = useStore(s => s.cards)
   const plan = useStore(s => s.plan)
   const todos = useStore(s => s.todos)
-  const inboxScope = useStore(s => s.inboxScope)
+  const scratch = useStore(s => !!s.tasks.find(t => t.id === s.currentConvId)?.scratch)
+  const storedScope = useStore(s => s.inboxScope)
+  const inboxScope = scratch ? 'conv' : storedScope
   const projectCards = useStore(s => s.projectCards)
   const filter = useStore(s => s.ui.inboxFilter)
   const visible = inboxScope === 'project' ? projectCards : cards
@@ -87,7 +90,7 @@ export function Workbench() {
       </div>
       {rightTab === 'files'
         ? <FilesTab />
-        : <WorkTab plan={plan} todos={todos} filter={filter} inboxScope={inboxScope} projectCards={projectCards} cards={cards} />}
+        : <WorkTab plan={plan} todos={todos} filter={filter} inboxScope={inboxScope} projectCards={projectCards} cards={cards} scratch={scratch} />}
     </>
   )
 }
@@ -105,13 +108,14 @@ export function hasActiveProgressCard(cards: ActivityCard[]): boolean {
   return cards.some(c => c.kind === 'progress' && (c.status === 'active' || c.status === 'action_required'))
 }
 
-function WorkTab({ plan, todos, filter, inboxScope, projectCards, cards }: {
+function WorkTab({ plan, todos, filter, inboxScope, projectCards, cards, scratch }: {
   plan: Parameters<typeof CurrentTaskCard>[0]['plan']
   todos: Parameters<typeof CurrentTaskCard>[0]['todos']
   filter: InboxFilter
   inboxScope: 'conv' | 'project'
   projectCards: ActivityCard[]
   cards: ActivityCard[]
+  scratch: boolean
 }) {
   const record = useStore(s => s.workRecord)
   const showCurrentTask = !hasActiveProgressCard(cards)
@@ -122,16 +126,16 @@ function WorkTab({ plan, todos, filter, inboxScope, projectCards, cards }: {
         {showCurrentTask ? <CurrentTaskCard plan={plan} todos={todos} /> : null}
         <div className="inbox-scope" role="tablist" aria-label="收件箱范围与筛选">
           <button className={inboxScope === 'conv' ? 'active' : ''} onClick={() => store.setInboxScope('conv')}>本会话</button>
-          <button className={inboxScope === 'project' ? 'active' : ''} onClick={() => store.setInboxScope('project')}>
+          {!scratch && <button className={inboxScope === 'project' ? 'active' : ''} onClick={() => store.setInboxScope('project')}>
             项目{pendingCount(projectCards) > 0 ? ` ${pendingCount(projectCards)}` : ''}
-          </button>
+          </button>}
           <span style={{ flex: 1 }} />
           <button className={filter === 'todo' ? 'active' : ''} title="只看待处理" onClick={() => store.setUI({ inboxFilter: 'todo' })}>待处理</button>
           <button className={filter === 'all' ? 'active' : ''} title="全部卡片" onClick={() => store.setUI({ inboxFilter: 'all' })}>全部</button>
         </div>
         {inboxScope === 'project'
           ? <ProjectInbox cards={projectCards} filter={filter} />
-          : <InboxList cards={cards} docBridge={docBridge} callbacks={inboxCallbacks} filter={filter} />}
+          : <InboxList cards={cards} docBridge={docBridge} callbacks={scratch ? scratchInboxCallbacks : inboxCallbacks} filter={filter} />}
         <WorkspaceSurfaces />
         </>}
       </div>

test/scratch-surfaces.test.ts

@@ -0,0 +1,92 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { createElement } from 'react'
+import { renderToStaticMarkup } from 'react-dom/server'
+import { setPersistedOpen } from '@ui'
+import type { ActivityCard } from '../src/contracts'
+import { Conversation } from '../src/components/Conversation'
+import { ConversationWork } from '../src/components/ConversationWork'
+import { Workbench } from '../src/components/Workbench'
+import { store } from '../src/store'
+
+// SSR has no browser subscription snapshot: substitute only the hook boundary.
+const snapshot = vi.hoisted(() => ({ state: undefined as ReturnType<typeof store.getState> | undefined }))
+vi.mock('../src/store', async importOriginal => {
+  const actual = await importOriginal<typeof import('../src/store')>()
+  return { ...actual, useStore: (select: (s: ReturnType<typeof store.getState>) => unknown) => select(snapshot.state!) }
+})
+
+// Record the callbacks each card surface receives; the rendered archive button belongs to the UI repo.
+const passed = vi.hoisted(() => ({ inbox: [] as Record<string, unknown>[], card: [] as Record<string, unknown>[] }))
+vi.mock('@ui', async importOriginal => {
+  const actual = await importOriginal<typeof import('@ui')>()
+  return {
+    ...actual,
+    InboxList: (props: { callbacks: Record<string, unknown> }) => { passed.inbox.push(props.callbacks); return null },
+    ActivityCardView: (props: { callbacks: Record<string, unknown> }) => { passed.card.push(props.callbacks); return null },
+  }
+})
+
+const timestamp = '2026-10-12T10:00:00Z'
+const card: ActivityCard = {
+  id: 'card_1', projectId: 'prj_1', conversationId: 'cnv_1', kind: 'progress', title: '整理材料',
+  status: 'active', tone: 'info', body: [], createdAt: timestamp, updatedAt: timestamp,
+}
+
+function setup(scratch: boolean) {
+  const base = store.getState()
+  snapshot.state = {
+    ...base, currentProjectId: 'prj_1', currentConvId: 'cnv_1', connected: true, inboxScope: 'project',
+    tasks: [{ id: 'cnv_1', projectId: 'prj_1', title: '讨论', createdAt: timestamp, updatedAt: timestamp, ...(scratch ? { scratch: true } : {}) }],
+    messages: [], cards: [card], projectCards: [], runs: [], activeHitl: [], live: null, artifacts: [], outbox: [], posting: false,
+    ui: { ...base.ui, rightCollapsed: true, rightTab: 'work', inboxFilter: 'all' },
+    cardActionStates: {}, workRecord: null, surfaces: [],
+  }
+}
+
+beforeEach(() => {
+  passed.inbox = []; passed.card = []
+  setPersistedOpen('conversation-settings:prj_1:cnv_1', true)
+})
+
+describe.each([
+  { name: 'scratch conversation', scratch: true },
+  { name: 'project conversation', scratch: false },
+])('project-only surfaces in a $name', ({ scratch }) => {
+  beforeEach(() => setup(scratch))
+
+  it(scratch ? 'hides the cross-conversation read setting' : 'keeps the cross-conversation read setting', () => {
+    const html = renderToStaticMarkup(createElement(Conversation))
+    expect(html).toContain('会话设置')
+    expect(html).toContain('这次工作的要求')
+    expect(html.includes('读取同项目的其他对话')).toBe(!scratch)
+    expect(html.includes('实际读取范围还需项目设置允许')).toBe(!scratch)
+  })
+
+  it(scratch ? 'keeps the conversation inbox without the project scope' : 'keeps the project scope and inbox', () => {
+    const html = renderToStaticMarkup(createElement(Workbench))
+    expect(html).toContain('本会话')
+    expect(html.includes('>项目')).toBe(!scratch)
+    expect(html.includes('项目收件箱为空')).toBe(!scratch)
+    if (scratch) {
+      expect(passed.inbox).toHaveLength(1)
+      expect(passed.inbox[0]).not.toHaveProperty('onArchive')
+      expect(passed.inbox[0]).toHaveProperty('onDismiss')
+    }
+  })
+
+  it(scratch ? 'omits archive-to-project from conversation inbox cards' : 'offers archive-to-project on conversation inbox cards', () => {
+    snapshot.state!.inboxScope = 'conv'
+    renderToStaticMarkup(createElement(Workbench))
+    expect(passed.inbox).toHaveLength(1)
+    expect(typeof passed.inbox[0].onArchive).toBe(scratch ? 'undefined' : 'function')
+  })
+
+  it(scratch ? 'omits archive-to-project from conversation work cards' : 'offers archive-to-project on conversation work cards', () => {
+    renderToStaticMarkup(createElement(ConversationWork))
+    expect(passed.card.length).toBeGreaterThan(0)
+    for (const callbacks of passed.card) {
+      expect(typeof callbacks.onArchive).toBe(scratch ? 'undefined' : 'function')
+      expect(callbacks).toHaveProperty('onDismiss')
+    }
+  })
+})