fix(ui-workspace): expand workspace before new session

.agents/notes/implemented/feature/2026-08-11-workspace-sidebar-order-and-folding.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-08-11-workspace-sidebar-order-and-folding.md
-2026-08-11-workspace-sidebar-order-and-folding.md: ad011d313dfea3e0c1992946230e3d9577646520
-2026-08-11-workspace-sidebar-order-and-folding.zh.md: a3391113869e4c9002ee0a803bb40fc11c523f68
+2026-08-11-workspace-sidebar-order-and-folding.md: f17855e17d389a85a473b76381f4da51d9bfd9be
+2026-08-11-workspace-sidebar-order-and-folding.zh.md: 7771322c93d75f6d257f323719988ea05f3bf6c2

.agents/notes/implemented/feature/2026-08-11-workspace-sidebar-order-and-folding.md

@@ -20,7 +20,7 @@ The client installs a Workspace drag optimistically. Request and frame generatio
 
 ### Session folding and view order
 
-Each Workspace persists one browser-local open state: closed means zero Session rows and open means up to five. When more Sessions exist, **Show more** reveals the remainder only for the current mount; closing the whole Workspace clears this transient expansion, so reopening returns to five. The current Session's group opens automatically only when the user has not already stored an explicit state for that Workspace. After a ready Workspace baseline changes, the browser removes expansion, order, and observed-timestamp records for ids absent from that baseline while retaining the Ungrouped key for expansion, order, and observed timestamps.
+Each Workspace persists one browser-local open state: closed means zero Session rows and open means up to five. When more Sessions exist, **Show more** reveals the remainder only for the current mount; closing the whole Workspace clears this transient expansion, so reopening returns to five. The current Session's group opens automatically only when the user has not already stored an explicit state for that Workspace. Creating a Session from a Workspace row opens the target group before starting the Session, keeping the new row visible when state propagation completes. After a ready Workspace baseline changes, the browser removes expansion, order, and observed-timestamp records for ids absent from that baseline while retaining the Ungrouped key for expansion, order, and observed timestamps.
 
 The combined view menu offers **Manual** and **Last updated** over one browser-local persisted order per group. A real Workspace initializes from `WorkspaceView.sessionIds`; Ungrouped initializes from recency and has no Host Session account. Entering Last updated performs one complete recency sort; a later user prompt or steer promotes that Session once, and dragging may edit the resulting order. Returning to Manual preserves the current order and only disables later activity promotion. Manual-mode drags for a real Workspace also write the Host Session account, while Ungrouped drags and activity promotion remain browser-local. The flat list uses recency because it has no single group account for Session drag.
 

.agents/notes/implemented/feature/2026-08-11-workspace-sidebar-order-and-folding.zh.md

@@ -20,7 +20,7 @@ Workspace 注册表持有持久 `workspaceIds` 顺序，并提供采用 DOM `ins
 
 ### Session 折叠与视图顺序
 
-每个 Workspace 持久化一项浏览器本地打开状态：关闭表示零条 Session 行，打开表示最多五条。存在更多 Session 时，**展开其余**只在当前挂载期间显示剩余项；关闭整个 Workspace 会清除此临时展开，因此重新打开时恢复为五条。只有在用户尚未为该 Workspace 存储明确状态时，当前 Session 所在分组才会自动打开。就绪的 Workspace 基线发生变化后，浏览器会移除基线中不存在 id 的展开状态、顺序和已观察时间戳记录，同时为 Ungrouped 保留展开、顺序和已观察时间戳所用的键。
+每个 Workspace 持久化一项浏览器本地打开状态：关闭表示零条 Session 行，打开表示最多五条。存在更多 Session 时，**展开其余**只在当前挂载期间显示剩余项；关闭整个 Workspace 会清除此临时展开，因此重新打开时恢复为五条。只有在用户尚未为该 Workspace 存储明确状态时，当前 Session 所在分组才会自动打开。从 Workspace 行创建 Session 时会在启动 Session 前打开目标分组，使状态传播完成后新行保持可见。就绪的 Workspace 基线发生变化后，浏览器会移除基线中不存在 id 的展开状态、顺序和已观察时间戳记录，同时为 Ungrouped 保留展开、顺序和已观察时间戳所用的键。
 
 组合视图菜单在每个分组各自的一份浏览器本地持久顺序上提供**手动排序**和**最近更新**。真实 Workspace 从 `WorkspaceView.sessionIds` 初始化；Ungrouped 从最近更新时间顺序初始化，且没有 Host Session 记账。进入最近更新时会执行一次完整的时间排序；后续 user prompt 或 steer 会将对应 Session 置顶一次，拖拽仍可编辑所得顺序。返回手动排序会保留当前顺序，只停用后续活动置顶。真实 Workspace 在手动模式下的拖拽还会写入 Host Session 记账，而 Ungrouped 拖拽和活动置顶保留在浏览器本地。平铺列表没有可承载 Session 拖拽的单一分组记账，因此使用最近更新顺序。
 

packages/client/ui-workspace/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-workspace/README.md
-README.md: 98edb22dd173d8d6f119a4494baeb7e16cec98f6
-README.zh.md: 4f0a8f1950889bb9247899ea14d062bd0ee07c4d
+README.md: cbb14183931f87315da89adc418084375d943002
+README.zh.md: bf8cdf6584d2320c46b2c86496362d7d08f5fd0c

packages/client/ui-workspace/README.md

@@ -4,7 +4,7 @@ English | [中文](README.zh.md)
 
 Shared Workspace browser and picker plugin. `WorkspaceBrowser` fills the sidebar's `sidebar.workspaces` slot, while `WorkspacePicker` fills the page-local Session Intent hero's `conversation.hero.workspace` slot; both surfaces use the same Workspace menu and add flow.
 
-The browser renders grouped or flat Session rows from the global runtime hooks and owns Workspace add/rename/reorder plus grouped Session reorder. A Workspace remembers whether it is closed or showing Sessions; an open Workspace shows five Sessions by default, offers a transient **Show more** control for the remainder, and returns to five after the whole Workspace is closed and reopened. Once the Workspace list baseline is ready, browser-persisted expansion and Session-order records retain only current Workspace ids plus Ungrouped. View options combine grouping with one browser-persisted Session order per group: real Workspaces initialize from `WorkspaceView.sessionIds`, while Ungrouped initializes from recency. Entering **Last updated** performs a complete recency sort and later user prompts or steers promote their Session once, while entering **Manual** preserves every current position and disables later promotion. Dragging edits the current order in either mode; Manual-mode drags for real Workspaces also update the Host Session account, while Ungrouped order remains browser-local because no Workspace owns those Sessions. Workspace drag order is Host-durable in either Session order mode.
+The browser renders grouped or flat Session rows from the global runtime hooks and owns Workspace add/rename/reorder plus grouped Session reorder. A Workspace remembers whether it is closed or showing Sessions; an open Workspace shows five Sessions by default, offers a transient **Show more** control for the remainder, and returns to five after the whole Workspace is closed and reopened. Creating a Session from a Workspace row first opens that group so the new row remains visible when the Session state arrives. Once the Workspace list baseline is ready, browser-persisted expansion and Session-order records retain only current Workspace ids plus Ungrouped. View options combine grouping with one browser-persisted Session order per group: real Workspaces initialize from `WorkspaceView.sessionIds`, while Ungrouped initializes from recency. Entering **Last updated** performs a complete recency sort and later user prompts or steers promote their Session once, while entering **Manual** preserves every current position and disables later promotion. Dragging edits the current order in either mode; Manual-mode drags for real Workspaces also update the Host Session account, while Ungrouped order remains browser-local because no Workspace owns those Sessions. Workspace drag order is Host-durable in either Session order mode.
 
 Collapsed search is one header action beside the view and add actions. Activating it expands the field across the header; an outside click collapses only a query that is empty after trimming, while the clear control always resets and collapses it. A non-blank search query replaces either browsing mode with one flat result list: case-insensitive title and Workspace substring matches appear immediately, while a 250 ms debounced Host request adds ranked current-conversation content matches and snippets. The English search input and its defensive request path remove NUL, cap the query at the wire schema's 500 UTF-16 code units without splitting a surrogate pair, and preserve the existing debounce and cancellation behavior. Each new query aborts the preceding request; a failed content search leaves metadata matches visible with a warning. The list is capped at 20, asks the user to narrow broader queries, and opens the selected Session without clearing the query or jumping to a specific event.
 

packages/client/ui-workspace/README.zh.md

@@ -4,7 +4,7 @@
 
 共享 Workspace 浏览器与选择器插件。`WorkspaceBrowser` 填充侧边栏的 `sidebar.workspaces` slot，`WorkspacePicker` 则填充页面局部 Session Intent 主视觉区的 `conversation.hero.workspace` slot；两个界面使用同一套 Workspace 菜单和添加流程。
 
-该浏览器通过全局运行时钩子将 Session 行渲染为分组或扁平形式，并负责 Workspace 添加／重命名／重排序以及分组内的 Session 重排序。每个 Workspace 会记住自身是关闭还是显示 Session；打开后默认显示五条 Session，其余条目通过临时的**展开其余**控件显示，而关闭并重新打开整个 Workspace 后会恢复为五条。Workspace 列表基线就绪后，浏览器持久化的展开状态与 Session 顺序记录只保留当前 Workspace id 和 Ungrouped。视图选项把分组方式和每个分组各自的一份浏览器持久化 Session 顺序放在一起：真实 Workspace 从 `WorkspaceView.sessionIds` 初始化，Ungrouped 则从最近更新时间顺序初始化。进入**最近更新**时会执行一次完整的时间排序，后续 user prompt 或 steer 会将对应 Session 置顶一次；进入**手动排序**则保留所有当前位置并停用后续置顶。两种模式下的拖拽都会编辑当前顺序；真实 Workspace 在手动模式下的拖拽还会更新 Host Session 记账，而 Ungrouped 因没有 Workspace 持有其中的 Session，其顺序始终只保存在浏览器本地。无论采用哪种 Session 顺序，Workspace 拖拽顺序都由 Host 持久化。
+该浏览器通过全局运行时钩子将 Session 行渲染为分组或扁平形式，并负责 Workspace 添加／重命名／重排序以及分组内的 Session 重排序。每个 Workspace 会记住自身是关闭还是显示 Session；打开后默认显示五条 Session，其余条目通过临时的**展开其余**控件显示，而关闭并重新打开整个 Workspace 后会恢复为五条。从 Workspace 行创建 Session 时会先打开该分组，使 Session 状态到达后新行保持可见。Workspace 列表基线就绪后，浏览器持久化的展开状态与 Session 顺序记录只保留当前 Workspace id 和 Ungrouped。视图选项把分组方式和每个分组各自的一份浏览器持久化 Session 顺序放在一起：真实 Workspace 从 `WorkspaceView.sessionIds` 初始化，Ungrouped 则从最近更新时间顺序初始化。进入**最近更新**时会执行一次完整的时间排序，后续 user prompt 或 steer 会将对应 Session 置顶一次；进入**手动排序**则保留所有当前位置并停用后续置顶。两种模式下的拖拽都会编辑当前顺序；真实 Workspace 在手动模式下的拖拽还会更新 Host Session 记账，而 Ungrouped 因没有 Workspace 持有其中的 Session，其顺序始终只保存在浏览器本地。无论采用哪种 Session 顺序，Workspace 拖拽顺序都由 Host 持久化。
 
 折叠搜索是视图和添加操作旁的一枚区头按钮。激活后，输入框会扩展并占据区头；点击外部只会收起经清除首尾空白后为空的查询，而清除控件总会重置并收起搜索。非空白查询会以单一扁平结果列表替代任一浏览模式：不区分大小写的标题和 Workspace 子串匹配项会立即显示，经 250 ms 防抖的 Host 请求则会加入经过排序的当前对话内容匹配项及其摘要片段。英文搜索输入框及其防御性请求路径会移除 NUL，将查询限制在传输 schema 规定的 500 个 UTF-16 代码单元内且不会拆分代理项对，并保留现有的防抖与取消行为。每次新查询都会中止前一个请求；内容搜索失败时，元数据匹配项仍会显示，同时给出警告。列表最多显示 20 条结果，并会在查询过宽时提示用户缩小范围；打开所选 Session 时既不会清除查询，也不会跳转至特定事件。
 

packages/client/ui-workspace/src/client/WorkspaceBrowser.tsx

@@ -428,7 +428,10 @@ function SessionTree({
                   setWorkspaceExpanded(group.key, !group.expanded)
                 }}
                 onCreate={() => {
-                  if (group.workspaceId !== undefined) startSession(group.workspaceId)
+                  if (group.workspaceId !== undefined) {
+                    setWorkspaceExpanded(group.key, true)
+                    startSession(group.workspaceId)
+                  }
                 }}
                 drag={workspaceDragProps}
                 actions={group.workspaceId === undefined

packages/client/ui-workspace/tests/workspace-browser.spec.tsx

@@ -314,16 +314,20 @@ describe('WorkspaceBrowser', () => {
     expect(screen.getByText('child-s').closest('[role="treeitem"]')?.getAttribute('draggable')).toBe('true')
   })
 
-  it('auto-expands the selected session group and starts a session from the group ＋', () => {
+  it('expands the target group before starting a session from its ＋', () => {
     const startSession = vi.fn()
-    mount({
-      useSessions: hook(sessionState([summary('alpha-s', 1)], { current: sid('alpha-s') })),
+    const b = mount({
+      useSessions: hook(sessionState([summary('alpha-s', 1)])),
       useWorkspaces: hook(workspaceState([workspace('alpha', ['alpha-s'])])),
       startSession,
     })
-    // The current-group effect expanded the owning group without a click.
-    expect(screen.getByText('alpha-s')).toBeTruthy()
+    startSession.mockImplementation(() => {
+      expect(b.store.getSnapshot().workspaceExpansion).toEqual({ alpha: true })
+    })
+    expect(screen.queryByText('alpha-s')).toBeNull()
     fireEvent.click(screen.getByRole('button', { name: '在“alpha”中新建会话' }))
+    expect(b.store.getSnapshot().workspaceExpansion).toEqual({ alpha: true })
+    expect(screen.getByText('alpha-s')).toBeTruthy()
     expect(startSession).toHaveBeenCalledWith(wid('alpha'))
   })