fix(web): hide session lineage in header

packages/client/ui-conversation/tests/apply-inject.spec.tsx

@@ -228,12 +228,9 @@ describe('conversation slot inject surface', () => {
     await b.runtime.dispose()
   })
 
-  it('routes navigation and workspace switching through the runtime owners, carrying the draft', async () => {
+  it('routes workspace switching through the runtime owner, carrying the draft', async () => {
     const b = await bench()
-    const { injected } = b.conversationSurface(ROOT)
     const resident = b.residentSurface(ROOT)
-    injected.open(ROOT)
-    expect(b.runtime.sessions.calls).toContainEqual({ method: 'open', args: [ROOT] })
     // Same-session connect (the picked workspace resolves to this session):
     // no draft movement, plain re-open.
     b.runtime.workspaces.stub('connectWorkspace', () => Promise.resolve(ROOT))
@@ -241,7 +238,7 @@ describe('conversation slot inject surface', () => {
     actions.setDraft('carry me')
     void resident.selectWorkspace('workspace-1' as never)
     await vi.waitFor(() => {
-      expect(b.runtime.sessions.calls.filter(c => c.method === 'open')).toHaveLength(2)
+      expect(b.runtime.sessions.calls.filter(c => c.method === 'open')).toHaveLength(1)
     })
     expect(b.runtime.workspaces.calls).toContainEqual({ method: 'connectWorkspace', args: ['workspace-1'] })
     expect(state.getSnapshot().draft).toBe('carry me')

packages/client/ui-conversation/tests/assembly-surfaces.spec.tsx

@@ -20,7 +20,7 @@
  * suite only proves the assembled wiring.
  */
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
-import { cleanup, fireEvent, waitFor, within } from '@testing-library/react'
+import { cleanup, fireEvent, waitFor } from '@testing-library/react'
 import { LocaleService } from '@deepseek-ai/dsh-client-locale/client'
 import type { ISession, SessionId, TodoItem, ToolResultNode } from '@deepseek-ai/dsh-client-runtime/client'
 import type { PropsRenderSlots } from '@deepseek-ai/dsh-client-ui-slots'
@@ -256,16 +256,14 @@ describe('prompt rejection through the assembled composer', () => {
 })
 
 describe('title projection across assembled surfaces', () => {
-  it('one summary update re-labels the breadcrumb and document.title consumers together', async () => {
+  it('one summary update re-labels the current-session heading', async () => {
     const runtime = await bench([])
     const view = runtime.renderRoot()
-    // The strict session header breadcrumb reads useSessions ancestry.
-    const crumb = within(view.container.querySelector('[aria-label="会话层级"]') as HTMLElement)
-    expect(crumb.getByText('S')).toBeTruthy()
+    expect(view.getByRole('heading', { name: 'S', level: 1 })).toBeTruthy()
 
     await runtime.sessions.updateSummary(SID, { displayTitle: '修订标题', title: '修订标题' })
-    await waitFor(() => { expect(crumb.getByText('修订标题')).toBeTruthy() })
-    expect(crumb.queryByText('S')).toBeNull()
+    await waitFor(() => { expect(view.getByRole('heading', { name: '修订标题', level: 1 })).toBeTruthy() })
+    expect(view.queryByRole('heading', { name: 'S', level: 1 })).toBeNull()
     await runtime.dispose()
   })
 })

packages/client/ui-conversation/tests/skeleton.spec.tsx

@@ -111,7 +111,6 @@ function mount(
   const useInput = bindSnapshotSelector(wiring.state)
   const inputActions = wiring.actions
   const stop = vi.fn()
-  const open = vi.fn()
   const slotCalls: string[] = []
   let pickerOwner: unknown
   const renderSlot = ((key: string, owner: object, opts?: { only?: string }) => {
@@ -140,8 +139,6 @@ function mount(
             version: () => 1,
           }}
           bindDraftMirror={write => wiring.bindMirror(write)}
-          open={open}
-          t={t}
           {...owner}
         />
       )
@@ -203,7 +200,7 @@ function mount(
   }
   const view = render(<ConversationRoot {...props} />)
   return {
-    view, chat, sink, open, retargetWorkspace, session, slotCalls,
+    view, chat, sink, retargetWorkspace, session, slotCalls,
     pickerOwner: () => pickerOwner,
     rerender: () => { view.rerender(<ConversationRoot {...props} />) },
   }
@@ -218,8 +215,8 @@ describe('ConversationRoot resident composer', () => {
     expect(b.chat.store.getSnapshot().draft).toBe('ordinary revised')
     fireEvent.keyDown(box, { key: 'Enter' })
     expect(b.sink).toHaveBeenCalledWith('ordinary revised')
-    fireEvent.click(b.view.getByRole('button', { name: 'Root' }))
-    expect(b.open).toHaveBeenCalledWith(sid('root'))
+    expect(b.view.getByRole('heading', { name: 'Child', level: 1 })).toBeTruthy()
+    expect(b.view.queryByText('Root')).toBeNull()
   })
 
   it('active phase: fixed header outside the scrollport; sticky composer seat inside it', () => {