feat(gui): animate sidebar collapse and grow the rail control set

The collapsed rail becomes a 56px icon column (24px controls between 16px
paddings) carrying expand, new session, search, and new workspace — each
aligned with its expanded counterpart; rail search expands the sidebar and
focuses the search box. Collapse/expand now animates: the frame transitions
grid-template-columns (and the surviving handle its left) on the deepsuite
sider curve — --ds-ease-in-out over --ds-transition-duration-slow, supplied
by ui-theme's base sheet. Transitions pause during drags (data-dragging on
the frame, set for the whole gesture) and under prefers-reduced-motion.

.agents/notes/implemented/bug-fix/2026-07-22-collapsed-sidebar-control-rail.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
-2026-07-22-collapsed-sidebar-control-rail.md: 9f244010a1ec14eeafe707aedfffcf7e5bbe7736
-2026-07-22-collapsed-sidebar-control-rail.zh.md: 53007bf717404b151d0a2d1f673c20f111ee8234
+2026-07-22-collapsed-sidebar-control-rail.md: 90039110f4c1e97002fe45ebe42697452b2c6155
+2026-07-22-collapsed-sidebar-control-rail.zh.md: e5cd1c4911bbe02e10d2f1506943024bde862f12

.agents/notes/implemented/bug-fix/2026-07-22-collapsed-sidebar-control-rail.md

@@ -10,11 +10,11 @@ The sidebar close action persisted a zero width preference, and the layout mappe
 
 ## Decision
 
-The layout maps a closed sidebar (persisted width `0`) to the fixed `SIDEBAR_COLLAPSED` width of 60px: one 28px icon control between the sidebar's 16px horizontal paddings. The compact rail participates in the concession solver and retains its right border, while the stored expanded width remains untouched.
+The layout maps a closed sidebar (persisted width `0`) to the fixed `SIDEBAR_COLLAPSED` width of 56px: a 24px icon column between the sidebar's 16px horizontal paddings. The compact rail participates in the concession solver and retains its right border, while the stored expanded width remains untouched.
 
-`AppFrame` marks the sidebar collapsed from the persisted width preference rather than from the resolved track width, removes the resize handle while collapsed, and passes `collapsed` to the sidebar slot as owner props from the render site.
+`AppFrame` marks the sidebar collapsed from the persisted width preference rather than from the resolved track width, removes the resize handle while collapsed, and passes `collapsed` to the sidebar slot as owner props from the render site. Collapse and expand animate: the frame transitions `grid-template-columns` (and the remaining handle its `left`) on the deepsuite sider curve — `--ds-ease-in-out` over `--ds-transition-duration-slow`, both supplied by ui-theme's base sheet; transitions pause during drags and under `prefers-reduced-motion`.
 
-`SidebarRoot` reads the owner `collapsed` prop. Its collapsed render removes the brand, creation controls, search, and session tree from the rendered and accessibility trees — the body component unmounts, dropping its sessions subscription; the top control changes to `Expand sidebar`, and the bottom `Settings` control remains in the rail.
+`SidebarRoot` reads the owner `collapsed` prop. Its collapsed render is the rail: expand toggle, new session, search, and new workspace icons (each aligned with its expanded counterpart's behavior — the search icon expands the sidebar and focuses the search box) plus the `Settings` foot. The brand, capsule button, search field, and session tree leave the rendered and accessibility trees — the body component unmounts, dropping its sessions subscription.
 
 ## Alternatives considered
 
@@ -24,6 +24,6 @@ The layout maps a closed sidebar (persisted width `0`) to the fixed `SIDEBAR_COL
 
 ## Consequences
 
-- A collapsed sidebar reserves 60px instead of yielding the entire width to the center column. Expanding restores the persisted width and drag behavior.
+- A collapsed sidebar reserves 56px instead of yielding the entire width to the center column. Expanding restores the persisted width and drag behavior.
 - The settings entry remains visible but retains its existing placeholder behavior; this change does not introduce an account or settings screen.
 - Layout solver tests pin the compact width, sidebar component tests pin the visible controls, and the keyless real-bundle web smoke test pins collapse and recovery through the assembled client.

.agents/notes/implemented/bug-fix/2026-07-22-collapsed-sidebar-control-rail.zh.md

@@ -10,11 +10,11 @@ Status: implemented
 
 ## 决策
 
-布局将关闭的侧边栏（持久化宽度为 `0`）映射为固定的 `SIDEBAR_COLLAPSED` 宽度 60px：在侧边栏两侧各 16px 的水平内边距之间放置一个 28px 的图标控件。紧凑控制栏参与空间收缩求解，并保留右侧边框；已存储的展开宽度保持不变。
+布局将关闭的侧边栏（持久化宽度为 `0`）映射为固定的 `SIDEBAR_COLLAPSED` 宽度 56px：在侧边栏两侧各 16px 的水平内边距之间放置一列 24px 的图标控件。紧凑控制栏参与空间收缩求解，并保留右侧边框；已存储的展开宽度保持不变。
 
-`AppFrame` 根据持久化的宽度偏好标记侧边栏是否折叠，而不是根据求解后的轨道宽度来判断；折叠时移除尺寸调整手柄，并在渲染点把 `collapsed` 作为 owner props 传给侧边栏插槽。
+`AppFrame` 根据持久化的宽度偏好标记侧边栏是否折叠，而不是根据求解后的轨道宽度来判断；折叠时移除尺寸调整手柄，并在渲染点把 `collapsed` 作为 owner props 传给侧边栏插槽。折叠与展开带动画：frame 对 `grid-template-columns`（以及余下手柄的 `left`）应用 deepsuite 侧栏曲线过渡——`--ds-ease-in-out` 配 `--ds-transition-duration-slow`，两个变量由 ui-theme 的 base 表提供；拖拽期间和 `prefers-reduced-motion` 下过渡暂停。
 
-`SidebarRoot` 读取 owner 的 `collapsed` 属性。折叠状态下的渲染会将品牌标识、创建控件、搜索框和会话树从渲染树与可访问性树中移除——主体组件卸载，随之退订会话列表；顶部控件变为 `Expand sidebar`，底部的 `Settings` 控件则留在控制栏中。
+`SidebarRoot` 读取 owner 的 `collapsed` 属性。折叠渲染即控制栏：展开开关、新建会话、搜索、新建工作区四个图标（行为与展开态对应控件对齐——搜索图标会展开侧边栏并聚焦搜索框），加上底部的 `Settings`。品牌标识、胶囊按钮、搜索框和会话树离开渲染树与可访问性树——主体组件卸载，随之退订会话列表。
 
 ## 曾考虑的替代方案
 
@@ -24,6 +24,6 @@ Status: implemented
 
 ## 后果
 
-- 折叠的侧边栏占用 60px，而不是把全部宽度让给中心列。展开时恢复持久化宽度与拖动行为。
+- 折叠的侧边栏占用 56px，而不是把全部宽度让给中心列。展开时恢复持久化宽度与拖动行为。
 - 设置入口持续可见，但保留既有占位行为；本次改动不提供账户或设置页面。
 - 布局求解器测试固定紧凑宽度，侧边栏组件测试固定可见控件，基于真实构建产物的无密钥 Web 冒烟测试则通过组装后的客户端固定折叠与恢复行为。

apps/web/tests/smoke-fixture.e2e.ts

@@ -136,18 +136,32 @@ describe('web boot chain success pass (keyless, six real bundles, ?fixture)', ()
     expect(owners).toContain('@deepseek-ai/dsh-client-ui-sidebar')
   })
 
-  it('collapsed sidebar keeps a 60px rail with expand and settings controls', async () => {
+  it('collapsed sidebar animates to a 56px rail with the four controls', async () => {
     onTestFailed(() => saveFailureShot(page, 'smoke-boot-collapsed-rail'))
     const frame = page.locator('[class*="frame"]')
     const firstTrack = async (): Promise<string> => (await frame.evaluate(
       el => getComputedStyle(el).gridTemplateColumns)).split(' ')[0]!
+    // The tracks transition on the deepsuite curve; assert the animated
+    // settle rather than an instant jump.
+    const settledTrack = async (px: string): Promise<void> => {
+      await expect.poll(firstTrack, { timeout: 2000 }).toBe(px)
+    }
     await page.getByRole('button', { name: 'Collapse sidebar' }).click()
-    expect(await firstTrack()).toBe('60px')
-    await expect(page.getByRole('button', { name: 'Expand sidebar' }).isVisible()).resolves.toBe(true)
-    await expect(page.getByRole('button', { name: 'Settings' }).isVisible()).resolves.toBe(true)
+    await settledTrack('56px')
+    for (const name of ['Expand sidebar', 'New session', 'Search sessions', 'New workspace', 'Settings']) {
+      await expect(page.getByRole('button', { name }).isVisible(), name).resolves.toBe(true)
+    }
     await page.getByRole('button', { name: 'Expand sidebar' }).click()
-    expect(await firstTrack()).toBe('300px')
+    await settledTrack('300px')
     await expect(page.getByRole('button', { name: 'Collapse sidebar' }).isVisible()).resolves.toBe(true)
+    // Rail search: collapse again, the search control expands and lands in the box.
+    await page.getByRole('button', { name: 'Collapse sidebar' }).click()
+    await settledTrack('56px')
+    await page.getByRole('button', { name: 'Search sessions' }).click()
+    await settledTrack('300px')
+    const focused = await page.evaluate(() =>
+      (document.activeElement as HTMLInputElement | null)?.placeholder ?? '')
+    expect(focused).toContain('Search')
   })
 
   it('stayed clean: no page errors across the whole load chain', () => {

packages/client/ui-layout/README.md

@@ -1,6 +1,6 @@
 # @deepseek-ai/dsh-client-ui-layout
 
-Shell plugin: three-column AppFrame (drag handles, concession chain) + ctx.layout viewing-state service (nav, panel widths, persist); defines the sidebar/conversation/details/conversation.empty slots. A closed sidebar retains a 60px control rail while details closes to zero width. Contract: api-contracts v3 §5.
+Shell plugin: three-column AppFrame (drag handles, concession chain) + ctx.layout viewing-state service (nav, panel widths, persist); defines the sidebar/conversation/details/conversation.empty slots. A closed sidebar retains a 56px control rail while details closes to zero width; collapse/expand animates the grid tracks on the deepsuite sider curve. Contract: api-contracts v3 §5.
 
 Slot declarations use the composed-props entry form (`owner` share, no full `props`): the exported OwnerShare contracts are `SidebarOwnerProps` / `ConvOwnerProps` / `DetailsOwnerProps` / `EmptyOwnerProps` — registrants reference them via `OwnerOf<'sidebar' | ...>` and compose their own injected share locally. No entry declares `children` (declaring it requires the registered component to carry the slots face — reserved for future business slots): delegation authority is the component-side whitelist, i.e. AppFrame's `ScopedSlots<FrameSlotKey>` face over sidebar/conversation/details/conversation.empty. Since the root-slot rework the frame itself registers into 'root' and renders those child slots at its own render sites; the shell only renders 'root'.
 

packages/client/ui-layout/src/client/AppFrame.module.css

@@ -5,6 +5,21 @@
   height: 100%;
   overflow: hidden;
   background: var(--dsw-alias-bg-base);
+  /* Collapse/expand animates the tracks on the deepsuite sider curve
+     (--ds-ease-in-out / --ds-transition-duration-slow, ui-theme base.css). */
+  transition: grid-template-columns var(--ds-transition-duration-slow) var(--ds-ease-in-out);
+}
+
+/* Dragging writes widths at pointer cadence; easing them would detach the
+   column from the handle. */
+.frame[data-dragging] {
+  transition: none;
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .frame {
+    transition: none;
+  }
 }
 
 .sidebarCol {
@@ -46,6 +61,19 @@
   cursor: col-resize;
   z-index: 2;
   touch-action: none;
+  /* Rides the same curve as the tracks so the pill stays on the moving
+     border during collapse/expand; paused while dragging (frame rule). */
+  transition: left var(--ds-transition-duration-slow) var(--ds-ease-in-out);
+}
+
+.frame[data-dragging] .handle {
+  transition: none;
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .handle {
+    transition: none;
+  }
 }
 
 .handle::after {

packages/client/ui-layout/src/client/AppFrame.tsx

@@ -35,13 +35,13 @@ function DetailsColumn(props: { children?: ReactNode }) {
 }
 
 /** One drag handle: pointer capture, rAF-throttled dx reports against the drag-start origin. */
-function DragHandle(props: { left: number; onStart: () => void; onDrag: (dx: number) => void }) {
+function DragHandle(props: { left: number; onStart: () => void; onDrag: (dx: number) => void; onEnd: () => void }) {
   const [dragging, setDragging] = useState(false)
   const origin = useRef(0)
   const latest = useRef(0)
   const frame = useRef<number | null>(null)
-  const callbacks = useRef({ onStart: props.onStart, onDrag: props.onDrag })
-  callbacks.current = { onStart: props.onStart, onDrag: props.onDrag }
+  const callbacks = useRef({ onStart: props.onStart, onDrag: props.onDrag, onEnd: props.onEnd })
+  callbacks.current = { onStart: props.onStart, onDrag: props.onDrag, onEnd: props.onEnd }
 
   const onPointerDown = useCallback((e: React.PointerEvent<HTMLDivElement>) => {
     e.preventDefault()
@@ -65,6 +65,7 @@ function DragHandle(props: { left: number; onStart: () => void; onDrag: (dx: num
     if (frame.current !== null) { cancelAnimationFrame(frame.current); frame.current = null }
     callbacks.current.onDrag(latest.current - origin.current)
     setDragging(false)
+    callbacks.current.onEnd()
   }, [])
 
   return (
@@ -114,8 +115,12 @@ export function AppFrame({ useStore, actions, renderSlot, SessionProvider }: App
   // it stays frozen for the whole gesture so dx deltas do not compound.
   const sidebarBase = useRef(0)
   const detailsBase = useRef(0)
-  const onSidebarStart = useCallback(() => { sidebarBase.current = colsRef.current.sidebar }, [])
-  const onDetailsStart = useCallback(() => { detailsBase.current = colsRef.current.details }, [])
+  // Track-level transitions pause for the whole gesture: eased tracks would
+  // detach the column edge from the pointer (AppFrame.module.css).
+  const [dragging, setDragging] = useState(false)
+  const onDragEnd = useCallback(() => { setDragging(false) }, [])
+  const onSidebarStart = useCallback(() => { sidebarBase.current = colsRef.current.sidebar; setDragging(true) }, [])
+  const onDetailsStart = useCallback(() => { detailsBase.current = colsRef.current.details; setDragging(true) }, [])
   const onSidebarDrag = useCallback((dx: number) => {
     actions.setSidebar(sidebarBase.current + dx)
   }, [actions])
@@ -130,6 +135,7 @@ export function AppFrame({ useStore, actions, renderSlot, SessionProvider }: App
       style={{ gridTemplateColumns: `${cols.sidebar}px minmax(0, 1fr) ${cols.details}px` }}
       data-sidebar-collapsed={panels.sidebar === 0 || undefined}
       data-details-collapsed={cols.details === 0 || undefined}
+      data-dragging={dragging || undefined}
     >
       <div className={css.sidebarCol}>
         {/* Render-site slot call with live concession output: a closed
@@ -155,8 +161,8 @@ export function AppFrame({ useStore, actions, renderSlot, SessionProvider }: App
         )}
       </SessionProvider>
       {/* The collapsed rail is fixed-width: no resize handle while closed. */}
-      {panels.sidebar > 0 && <DragHandle left={cols.sidebar} onStart={onSidebarStart} onDrag={onSidebarDrag} />}
-      {cols.details > 0 && <DragHandle left={viewport - cols.details} onStart={onDetailsStart} onDrag={onDetailsDrag} />}
+      {panels.sidebar > 0 && <DragHandle left={cols.sidebar} onStart={onSidebarStart} onDrag={onSidebarDrag} onEnd={onDragEnd} />}
+      {cols.details > 0 && <DragHandle left={viewport - cols.details} onStart={onDetailsStart} onDrag={onDetailsDrag} onEnd={onDragEnd} />}
     </div>
   )
 }

packages/client/ui-layout/src/client/columns.ts

@@ -21,8 +21,8 @@ export const SIDEBAR_MIN = 240
 export const SIDEBAR_MAX = 420
 /** Sidebar width before any user drag. */
 export const SIDEBAR_DEFAULT = 300
-/** Closed-sidebar rail: one 28px control between 16px horizontal paddings. */
-export const SIDEBAR_COLLAPSED = 60
+/** Closed-sidebar rail: a 24px icon column between 16px horizontal paddings. */
+export const SIDEBAR_COLLAPSED = 56
 /** Details drag clamp floor. */
 export const DETAILS_MIN = 300
 /** Details drag clamp ceiling. */

packages/client/ui-sidebar/README.md

@@ -1,6 +1,6 @@
 # @deepseek-ai/dsh-client-ui-sidebar
 
-Sidebar plugin: session multi-level tree (cwd grouping + parentId nesting), search, by-workspace grouping, state dots, three creation entries. The collapsed render keeps the expand control and settings entry in the layout-owned compact rail. Contract: the [slot system standard](../../../.agents/notes/implemented/architecture/2026-07-22-slot-type-chain-implementation.md).
+Sidebar plugin: session multi-level tree (cwd grouping + parentId nesting), search, by-workspace grouping, state dots, three creation entries. The collapsed render is the layout-owned compact rail: expand / new session / search (expands and focuses the search box) / new workspace icons plus the settings entry. Contract: the [slot system standard](../../../.agents/notes/implemented/architecture/2026-07-22-slot-type-chain-implementation.md).
 
 `src/client/contract/slots.ts` is the single-domain contract file: `SidebarRootInjected` (the registrant's own injected share — plain service callbacks: onOpen/onCreate/onToggleSidebar) and `SidebarRootComponentProps = PropsRuntime<'sidebar'> & SidebarRootInjected` (owner `{collapsed,width}` plus the standard `useSessions` hook, resolved off ui-layout's SlotMap declaration, never re-stated). `apply` registers SidebarRoot cast-free against that composition; the inject factory closes over the plugin's own ctx.
 

packages/client/ui-sidebar/src/client/SidebarRoot.module.css

@@ -15,24 +15,24 @@
   font-size: 14px;
 }
 
-/* Closed state is a persistent rail: the layout reserves exactly the root's
-   horizontal padding plus one icon control. */
+/* Closed state is a persistent rail: a 24px icon column between the 16px
+   horizontal paddings (SIDEBAR_COLLAPSED = 56). Controls mirror their
+   expanded counterparts top-down: expand, new session, search, new
+   workspace; settings keeps the foot. */
 .root.collapsed {
-  gap: 0;
+  align-items: center;
+  gap: 8px;
+  padding: 14px 16px 6px;
 }
 
-.collapsed .headerBlock {
-  padding-bottom: 0;
-}
-
-.collapsed .logoRow {
-  justify-content: center;
-  padding-inline: 0;
+.collapsed .iconButton {
+  width: 24px;
+  height: 24px;
 }
 
 .collapsed .foot {
   justify-content: center;
-  width: 28px;
+  width: 24px;
   margin-top: auto;
   padding: 0;
 }

packages/client/ui-sidebar/src/client/SidebarRoot.tsx

@@ -5,10 +5,11 @@
  * standard useSessions hook, viewing state (expansion, search) is local
  * component state, and rows are derived in render via useMemo (slot design
  * section 6: derived data is a pure function, no materializing store).
- * The collapsed render keeps only the rail controls (expand toggle +
- * Settings); the body unmounts, dropping its sessions subscription.
+ * The collapsed render is the compact rail: expand / new session / search /
+ * new workspace icons plus the Settings foot; the body unmounts, dropping
+ * its sessions subscription. Rail search expands and focuses the search box.
  */
-import { Fragment, useMemo, useState } from 'react'
+import { Fragment, useEffect, useMemo, useState } from 'react'
 import clsx from 'clsx'
 import {
   FishLogo,
@@ -33,10 +34,13 @@ function toggled(list: readonly string[], key: string): string[] {
   return list.includes(key) ? list.filter((k) => k !== key) : [...list, key]
 }
 
-type SidebarBodyProps = Pick<SidebarRootComponentProps, 'useSessions' | 'onOpen' | 'onCreate'>
+type SidebarBodyProps = Pick<SidebarRootComponentProps, 'useSessions' | 'onOpen' | 'onCreate'> & {
+  /** Focus the search input on mount (rail search control expands into search). */
+  autoFocusSearch: boolean
+}
 
 /** Expanded-only content; unmounting drops the sessions subscription and viewing state while the rail is collapsed. */
-function SidebarBody({ useSessions, onOpen, onCreate }: SidebarBodyProps) {
+function SidebarBody({ useSessions, onOpen, onCreate, autoFocusSearch }: SidebarBodyProps) {
   const list = useSessions((s) => s)
   // Wave-2 seam: row highlight expects `current` on the sessions list
   // snapshot (sessions.current lives with the runtime sessions service).
@@ -99,6 +103,7 @@ function SidebarBody({ useSessions, onOpen, onCreate }: SidebarBodyProps) {
           type="text"
           placeholder="Search name, keywords..."
           value={query}
+          autoFocus={autoFocusSearch}
           onChange={(e) => { setQuery(e.target.value) }}
         />
         {query !== '' && (
@@ -152,41 +157,90 @@ function SidebarBody({ useSessions, onOpen, onCreate }: SidebarBodyProps) {
  * @returns the sidebar element tree.
  */
 export function SidebarRoot({ collapsed, useSessions, onOpen, onCreate, onToggleSidebar }: SidebarRootComponentProps) {
+  // Rail search = expand + land in the search box: the flag arms right before
+  // the expand toggle, the remounting SidebarBody autofocuses its input, and
+  // the post-commit effect disarms so later remounts stay unfocused.
+  const [searchOnExpand, setSearchOnExpand] = useState(false)
+  useEffect(() => {
+    if (!collapsed && searchOnExpand) setSearchOnExpand(false)
+  }, [collapsed, searchOnExpand])
+
+  if (collapsed) {
+    // Rail (figma parity with deepsuite CollapsedSider): the four controls
+    // mirror their expanded counterparts top-down; actions that need the
+    // expanded surface expand first.
+    return (
+      <div className={clsx(css.root, css.collapsed)}>
+        <button
+          type="button"
+          className={css.iconButton}
+          aria-label="Expand sidebar"
+          onClick={() => { onToggleSidebar() }}
+        >
+          <IconPanelLeftOutline16 />
+        </button>
+        <button
+          type="button"
+          className={css.iconButton}
+          aria-label="New session"
+          onClick={() => { onCreate() }}
+        >
+          <IconNewChatOutline16 />
+        </button>
+        <button
+          type="button"
+          className={css.iconButton}
+          aria-label="Search sessions"
+          onClick={() => { setSearchOnExpand(true); onToggleSidebar() }}
+        >
+          <IconSearchOutline16 />
+        </button>
+        <button
+          type="button"
+          className={css.iconButton}
+          aria-label="New workspace"
+          onClick={() => { onCreate() }}
+        >
+          <IconProjectAddOutline16 />
+        </button>
+        <div className={css.foot} role="button" tabIndex={0} aria-label="Settings">
+          <IconSettingsOutline14 />
+        </div>
+      </div>
+    )
+  }
+
   return (
-    <div className={clsx(css.root, collapsed && css.collapsed)}>
+    <div className={css.root}>
       <div className={css.headerBlock}>
         <div className={css.logoRow}>
-          {!collapsed && (
-            <span className={css.brand}>
-              {/* Wordmark svg not extracted yet (figma 88:8932) — text stands in at the same ink. */}
-              <FishLogo size={23} />
-              <span className={css.wordmark}>deepseek</span>
-              <span className={css.badge}>HARNESS</span>
-            </span>
-          )}
+          <span className={css.brand}>
+            {/* Wordmark svg not extracted yet (figma 88:8932) — text stands in at the same ink. */}
+            <FishLogo size={23} />
+            <span className={css.wordmark}>deepseek</span>
+            <span className={css.badge}>HARNESS</span>
+          </span>
           <button
             type="button"
             className={css.iconButton}
-            aria-label={collapsed ? 'Expand sidebar' : 'Collapse sidebar'}
+            aria-label="Collapse sidebar"
             onClick={() => { onToggleSidebar() }}
           >
             <IconPanelLeftOutline16 />
           </button>
         </div>
 
-        {!collapsed && (
-          <button type="button" className={css.newSession} onClick={() => { onCreate() }}>
-            <IconNewChatOutline16 size={14} />
-            New Session
-          </button>
-        )}
+        <button type="button" className={css.newSession} onClick={() => { onCreate() }}>
+          <IconNewChatOutline16 size={14} />
+          New Session
+        </button>
       </div>
 
-      {!collapsed && <SidebarBody useSessions={useSessions} onOpen={onOpen} onCreate={onCreate} />}
+      <SidebarBody useSessions={useSessions} onOpen={onOpen} onCreate={onCreate} autoFocusSearch={searchOnExpand} />
 
       <div className={css.foot} role="button" tabIndex={0} aria-label="Settings">
         <IconSettingsOutline14 />
-        {!collapsed && <span>Settings</span>}
+        <span>Settings</span>
       </div>
     </div>
   )

packages/client/ui-sidebar/tests/sidebar-root.spec.tsx

@@ -75,7 +75,7 @@ function mount(...summaries: SessionSummary[]) {
   )
   const onToggleSidebar = vi.fn(() => {
     collapsed = !collapsed
-    utils.rerender(view(collapsed ? 60 : 300))
+    utils.rerender(view(collapsed ? 56 : 300))
   })
   const utils = render(view(300))
   return { sessions, onOpen, onCreate, onToggleSidebar, ...utils }
@@ -158,21 +158,36 @@ describe('SidebarRoot', () => {
     expect(onCreate).toHaveBeenLastCalledWith('/proj')
   })
 
-  it('collapsed rail keeps the expand and settings controls', () => {
-    const { onToggleSidebar } = mount(...projectData())
+  it('collapsed rail keeps the four controls and settings', () => {
+    const { onToggleSidebar, onCreate } = mount(...projectData())
     act(() => { fireEvent.click(screen.getByLabelText('Collapse sidebar')) })
     expect(onToggleSidebar).toHaveBeenCalledOnce()
     expect(screen.getByLabelText('Expand sidebar')).toBeTruthy()
+    expect(screen.getByLabelText('New session')).toBeTruthy()
+    expect(screen.getByLabelText('Search sessions')).toBeTruthy()
+    expect(screen.getByLabelText('New workspace')).toBeTruthy()
     expect(screen.getByLabelText('Settings')).toBeTruthy()
     expect(screen.queryByText('HARNESS')).toBeNull()
     expect(screen.queryByText('New Session')).toBeNull()
     expect(screen.queryByRole('tree')).toBeNull()
+    // Rail creation entries route like their expanded counterparts.
+    act(() => { fireEvent.click(screen.getByLabelText('New session')) })
+    expect(onCreate).toHaveBeenLastCalledWith()
     act(() => { fireEvent.click(screen.getByLabelText('Expand sidebar')) })
     expect(onToggleSidebar).toHaveBeenCalledTimes(2)
     expect(screen.getByLabelText('Collapse sidebar')).toBeTruthy()
     expect(screen.getByText('New Session')).toBeTruthy()
   })
 
+  it('rail search expands the sidebar and focuses the search box', () => {
+    const { onToggleSidebar } = mount(...projectData())
+    act(() => { fireEvent.click(screen.getByLabelText('Collapse sidebar')) })
+    act(() => { fireEvent.click(screen.getByLabelText('Search sessions')) })
+    expect(onToggleSidebar).toHaveBeenCalledTimes(2)
+    const input = screen.getByPlaceholderText('Search name, keywords...')
+    expect(document.activeElement).toBe(input)
+  })
+
   it('group-by menu behaves', () => {
     mount(...projectData())
     expect(screen.queryByText('Update')).toBeNull()

packages/client/ui-theme/src/styles/base.css

@@ -1,10 +1,13 @@
-/* Base font-family variables referenced by the token sheets but defined
+/* Base variables referenced by the token sheets and component CSS but defined
  * upstream (deepsuite theme/global.css) — supplied here so the composite
- * --dsw-font-* variables resolve. Code stack deliberately omits a bare
- * `monospace` tail (Windows CJK falls back to SimSun otherwise). */
+ * --dsw-font-* variables resolve and motion rides the upstream curve. Code
+ * font stack deliberately omits a bare `monospace` tail (Windows CJK falls
+ * back to SimSun otherwise). */
 :root {
   --dsw-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
     'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
   --ds-font-family-code: 'SF Mono', 'JetBrains Mono', 'Fira Code', Consolas,
     'Liberation Mono', Menlo, Courier, 'PingFang SC', 'Microsoft YaHei';
+  --ds-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
+  --ds-transition-duration-slow: 0.3s;
 }