feat(client): land the chat-to-Context jump in the right Sidebar

The assistant-action jump now opens the Context tab on the right Sidebar
over the guarded `ctx.sidebarRight.openTab` optional seam (the column
expands in the same step, keeping the clicked reply in view) instead of
switching the conversation tab. Every harness or placement the seam
cannot serve — lines older than 0.1.5-rc.1, tab-only placement, no
mounted session surface, a hostile face — keeps the conversation-tab
activation as fallback. The tooltip is reworded neutrally ("Context
view") since the landing follows what the harness serves.

src/client/components/contextJump.tsx

@@ -1,19 +1,20 @@
 /**
- * The assistant-message action that jumps to the Context tab at this reply's
+ * The assistant-message action that opens the Context view at this reply's
  * turn. Registered on the harness `conversation.chat.assistant-actions` seat
  * (the icon row beside copy/branch), it receives the finalized reply's durable
  * message id, resolves the matching assistant node's seq off the `useChat`
- * node seat, records it in the viewFocus relay, and activates the Context
- * tab — where the jump pins the reply's TURN (see contextView's leg 2). An
- * unresolvable seq still switches tabs, just without a pin; a message id that
- * is not a plain string renders nothing at all.
+ * node seat, records it in the viewFocus relay, and opens the Context tab on
+ * the right Sidebar — where the jump pins the reply's TURN (see contextView's
+ * leg 2). A harness or placement without the sidebar tab falls back to the
+ * conversation tab; an unresolvable seq still opens the view, just without a
+ * pin; a message id that is not a plain string renders nothing at all.
  */
 
 import { type ReactElement } from 'react'
 import { Tooltip } from '@deepseek-ai/dsh-client-ui-primitives'
-import type { ConversationNodeLike, UseChatLike } from '../services'
+import type { ClientCtx, ConversationNodeLike, UseChatLike } from '../services'
 import { conversationNodesOf } from '../services'
-import { activateContextTab, requestContextFocus } from '../viewFocus'
+import { activateContextTab, openContextSidebar, requestContextFocus } from '../viewFocus'
 import type { ViewKit } from '../viewkit'
 
 /** The assistant-action seat's currency, as far as this button consumes it. */
@@ -50,7 +51,7 @@ function JumpIcon(): ReactElement {
   )
 }
 
-export function makeContextJumpButton(kit: ViewKit): (props: ContextJumpProps) => ReactElement | null {
+export function makeContextJumpButton(ctx: ClientCtx, kit: ViewKit): (props: ContextJumpProps) => ReactElement | null {
   const { t } = kit
   return function ContextJump(props: ContextJumpProps): ReactElement | null {
     const messageId = props.messageId
@@ -63,7 +64,9 @@ export function makeContextJumpButton(kit: ViewKit): (props: ContextJumpProps) =
       if (seq !== null && typeof sessionId === 'string' && sessionId !== '') {
         requestContextFocus(sessionId, seq)
       }
-      activateContextTab(t('tab'))
+      // The sidebar expands over the chat, keeping the clicked reply in view;
+      // a harness or placement without that tab keeps the tab activation.
+      if (!openContextSidebar(ctx)) activateContextTab(t('tab'))
     }
     return (
       <Tooltip label={t('jump.title')} side="bottom">

src/client/i18n.ts

@@ -85,7 +85,7 @@ export const DICT_ZH: Record<string, string> = {
   'brief.more': '+{n}',
   'brief.noInputs': '（无新增）',
   'brief.locate': '在上下文浏览器中查看',
-  'jump.title': '在上下文标签页中查看此轮',
+  'jump.title': '在上下文视图中查看此轮',
   'brief.turnTip': '这一轮开场时用户发送的消息；回合内的每一步都会回显同一条',
   'brief.inputTip': '上一步回复之后、本次请求发出前新进入上下文的内容——通常是上一步所调工具的结果；每轮的第一步无新增',
   'brief.replyTip': '这一步模型返回的内容（文本回复或工具调用）；此步发起的调用，其结果会出现在下一柱的「输入」行',
@@ -369,7 +369,7 @@ export const DICT_EN: Record<string, string> = {
   'brief.more': '+{n}',
   'brief.noInputs': '(nothing new)',
   'brief.locate': 'Reveal in Context Browser',
-  'jump.title': 'View this turn in the Context tab',
+  'jump.title': 'View this turn in the Context view',
   'brief.turnTip': 'The user message that opened this turn — every step of the turn recalls it',
   'brief.inputTip': 'What entered after the previous reply and before this request went out — usually the previous tool-call results; a turn opener has nothing new',
   'brief.replyTip': 'What the model returned on this step (a text reply or tool calls) — results of calls made here appear in the In row of the next bar',

src/client/index.ts

@@ -103,9 +103,10 @@ function apply(ctx: ClientCtx): void {
   }), 'dsh-context: placement')
 
   // Chat → Context jump: an icon in each finalized reply's action row that
-  // opens this tab pinned to that reply's turn (see contextJump.tsx; the
-  // relay and tab activation live in viewFocus.ts).
-  const ContextJump = makeContextJumpButton(kit)
+  // opens the Context tab on the right Sidebar pinned to that reply's turn —
+  // falling back to the conversation tab wherever the sidebar serves no tab
+  // (see contextJump.tsx; the relay and view activation live in viewFocus.ts).
+  const ContextJump = makeContextJumpButton(ctx, kit)
   ctx.slots.inject('conversation.chat.assistant-actions', () => {
     return ctx.slots.register(
       // After the shipped feedback entry (10), still inside the icon row.

src/client/viewFocus.ts

@@ -1,10 +1,14 @@
 /**
  * Chat → Context jump relay. The assistant-message action records the clicked
- * reply's request seq here and activates the Context tab; the Context view
+ * reply's request seq here and opens the Context view — the right Sidebar's
+ * tab when this harness serves one, else the conversation tab; the view
  * consumes the one-shot focus once its projection data is in. Module-level
  * per-session map — the same life pattern as the modal open-state stores.
  */
 
+import { asRecord, type ClientCtx } from './services'
+import { SIDEBAR_CONTEXT_KIND } from './sidebar'
+
 const pendingFocus = new Map<string, number>()
 
 /** Record the Context step (request seq) to reveal for `sessionId` — replaces any unconsumed request. */
@@ -20,6 +24,25 @@ export function takeContextFocus(sessionId: string): number | null {
   return seq
 }
 
+/**
+ * Open the Context tab on the right Sidebar over `ctx.sidebarRight.openTab`
+ * (the column expands in the same step). OPTIONAL seam, re-proved at call
+ * time: a harness without the service (every line older than 0.1.5-rc.1), a
+ * placement that registered no tab type, no mounted session surface, or a
+ * hostile face all report false so the caller keeps its conversation-tab
+ * fallback.
+ */
+export function openContextSidebar(ctx: ClientCtx): boolean {
+  try {
+    const face = asRecord(ctx.get('sidebarRight'))
+    if (face === null || typeof face.openTab !== 'function') return false
+    ;(face.openTab as (kind: string) => void).call(face, SIDEBAR_CONTEXT_KIND)
+    return true
+  } catch {
+    return false
+  }
+}
+
 /**
  * Activate the Context tab by clicking its own tab-bar button (the semantic
  * `button[role="tab"]` chrome the conversation shell renders for every view).

tests/client/components/contextJump.spec.ts

@@ -1,7 +1,8 @@
 // ContextJump (src/client/components/contextJump.tsx) — the assistant-action
 // jump button rendered for real: seat props re-proved, the clicked reply's
-// request seq resolved off the served node seat, the relay + tab activation
-// driven through the real viewFocus module.
+// request seq resolved off the served node seat, the relay + view opening
+// driven through the real viewFocus module over a test client context (no
+// sidebarRight service armed → the conversation-tab fallback).
 
 import { createElement as h } from 'react'
 import assert from 'node:assert/strict'
@@ -10,10 +11,11 @@ import { makeContextJumpButton } from '../../../src/client/components/contextJum
 import type { ConversationNodeLike, UseChatLike } from '../../../src/client/services'
 import { takeContextFocus } from '../../../src/client/viewFocus'
 import { DICT_EN } from '../../../src/client/i18n'
+import { asClientCtx, TestClientCtx } from '../helpers/harness'
 import { click, makeKit, mount, query, queryAll } from '../helpers/kit'
 
 const kit = makeKit()
-const Jump = makeContextJumpButton(kit)
+const Jump = makeContextJumpButton(asClientCtx(new TestClientCtx()), kit)
 
 const SESSION = 'sv-jump'
 
@@ -55,7 +57,7 @@ describe('ContextJump — seat guards', () => {
 })
 
 describe('ContextJump — click flow', () => {
-  test('resolves the reply seq off the session seat, records the relay, and activates the tab', async () => {
+  test('no sidebar face: resolves the reply seq, records the relay, and falls back to the tab', async () => {
     const bar = document.createElement('div')
     const chat = document.createElement('button')
     chat.setAttribute('role', 'tab')
@@ -135,3 +137,50 @@ describe('ContextJump — click flow', () => {
     }
   })
 })
+
+describe('ContextJump — sidebar landing', () => {
+  test('a served sidebarRight face opens the Context tab there, leaving the conversation tab alone', async () => {
+    const opened: string[] = []
+    const ctx = new TestClientCtx({ services: { sidebarRight: { openTab: (kind: string) => { opened.push(kind) } } } })
+    const SidebarJump = makeContextJumpButton(asClientCtx(ctx), kit)
+    const bar = document.createElement('div')
+    const context = document.createElement('button')
+    context.setAttribute('role', 'tab')
+    context.textContent = 'Context'
+    let contextClicks = 0
+    context.addEventListener('click', () => { contextClicks++ })
+    bar.appendChild(context)
+    document.body.appendChild(bar)
+    try {
+      const m = await mount(h(SidebarJump, { messageId: 'msg-4', sessionId: SESSION, ...chatWith([reply]) }))
+      await click(query(m.container, 'button.lc-jump'))
+      assert.deepEqual(opened, ['dsh-context'], 'the sidebar Context tab was opened by kind')
+      assert.equal(takeContextFocus(SESSION), 4, 'the clicked reply’s request seq rides the relay')
+      assert.equal(contextClicks, 0, 'the conversation tab was not touched')
+      await m.unmount()
+    } finally {
+      bar.remove()
+    }
+  })
+
+  test('an openTab that refuses (no mounted surface, unregistered kind) falls back to the tab', async () => {
+    const ctx = new TestClientCtx({ services: { sidebarRight: { openTab: () => { throw new Error('refused') } } } })
+    const SidebarJump = makeContextJumpButton(asClientCtx(ctx), kit)
+    const bar = document.createElement('div')
+    const context = document.createElement('button')
+    context.setAttribute('role', 'tab')
+    context.textContent = 'Context'
+    let contextClicks = 0
+    context.addEventListener('click', () => { contextClicks++ })
+    bar.appendChild(context)
+    document.body.appendChild(bar)
+    try {
+      const m = await mount(h(SidebarJump, { messageId: 'msg-4', sessionId: SESSION, ...chatWith([reply]) }))
+      await click(query(m.container, 'button.lc-jump'))
+      assert.equal(contextClicks, 1, 'the refused open falls back to the conversation tab')
+      await m.unmount()
+    } finally {
+      bar.remove()
+    }
+  })
+})

tests/client/index.spec.ts

@@ -116,7 +116,7 @@ describe('client entry: assistant-actions seat', () => {
 
     const el = component({ messageId: 'm1' }) as ReactElement
     const m = await mount(el)
-    assert.equal(query(m.container, 'button.lc-jump').getAttribute('aria-label'), 'View this turn in the Context tab')
+    assert.equal(query(m.container, 'button.lc-jump').getAttribute('aria-label'), 'View this turn in the Context view')
     await m.unmount()
 
     // Interruption-frozen partials address no durable message: nothing renders.

tests/client/viewFocus.spec.ts

@@ -1,9 +1,11 @@
-// viewFocus (src/client/viewFocus.ts) — the chat→Context jump relay and the
-// Context-tab activation, driven against a real jsdom tab bar.
+// viewFocus (src/client/viewFocus.ts) — the chat→Context jump relay, the
+// sidebar-tab opener, and the conversation-tab activation, driven against a
+// real jsdom tab bar.
 
 import assert from 'node:assert/strict'
 import { describe, test } from 'vitest'
-import { activateContextTab, requestContextFocus, takeContextFocus } from '../../src/client/viewFocus'
+import { activateContextTab, openContextSidebar, requestContextFocus, takeContextFocus } from '../../src/client/viewFocus'
+import { asClientCtx, TestClientCtx } from './helpers/harness'
 
 describe('context focus relay', () => {
   test('one request survives until taken, then the map entry is consumed', () => {
@@ -22,6 +24,33 @@ describe('context focus relay', () => {
   })
 })
 
+describe('openContextSidebar', () => {
+  test('opens the registered kind through the sidebarRight face', () => {
+    const opened: string[] = []
+    const ctx = new TestClientCtx({ services: { sidebarRight: { openTab: (kind: string) => { opened.push(kind) } } } })
+    assert.equal(openContextSidebar(asClientCtx(ctx)), true)
+    assert.deepEqual(opened, ['dsh-context'])
+  })
+
+  test('no service, or a face without the verb, reports false', () => {
+    assert.equal(openContextSidebar(asClientCtx(new TestClientCtx())), false)
+    assert.equal(openContextSidebar(asClientCtx(new TestClientCtx({ services: { sidebarRight: {} } }))), false)
+    assert.equal(openContextSidebar(asClientCtx(new TestClientCtx({ services: { sidebarRight: null } }))), false)
+    assert.equal(openContextSidebar(asClientCtx(new TestClientCtx({ services: { sidebarRight: 'x' } }))), false)
+  })
+
+  test('a hostile face — throwing read or openTab — reports false, never throws', () => {
+    const throwingRead = {
+      get(_name: string): unknown { throw new Error('boom') },
+    } as unknown as TestClientCtx
+    assert.equal(openContextSidebar(asClientCtx(throwingRead)), false)
+    const ctx = new TestClientCtx({ services: {
+      sidebarRight: { openTab: () => { throw new Error('no session surface mounted') } },
+    } })
+    assert.equal(openContextSidebar(asClientCtx(ctx)), false)
+  })
+})
+
 describe('activateContextTab', () => {
   test('clicks the inactive tab matching the label, skips the active one, and reports misses', () => {
     type Counted = HTMLElement & { __clicks: () => number }