diff --git a/apps/desktop/src/App.tsx b/apps/desktop/src/App.tsx
index a7aaf31..c60ed5e 100644
--- a/apps/desktop/src/App.tsx
+++ b/apps/desktop/src/App.tsx
@@ -42,6 +42,7 @@ export function App() {
   const [projectModalOpen, setProjectModalOpen] = useState(false)
   const [profileModalOpen, setProfileModalOpen] = useState(false)
   const [experts, setExperts] = useState<Expert[]>([])
+  const workspaceRequestRef = useRef(0)
 
   useEffect(() => {
     if (!session) return
@@ -51,21 +52,29 @@ export function App() {
 
   async function loadWorkspaces(activeSession = session) {
     if (!activeSession) return
+    const requestId = ++workspaceRequestRef.current
     setLoading(true)
     setError('')
     try {
       const nextProjects = await fetchProjects(activeSession)
       const items = await Promise.all(nextProjects.map(async (project) => [project.id, await fetchProjectWorkspace(activeSession, project.id)] as const))
+      if (requestId !== workspaceRequestRef.current) return
       setProjects(nextProjects)
       setWorkspaces(Object.fromEntries(items))
       setProjectId((current) => current && nextProjects.some((project) => project.id === current) ? current : '')
     } catch (requestError) {
-      setError(errorMessage(requestError))
+      if (requestId === workspaceRequestRef.current) setError(errorMessage(requestError))
     } finally {
-      setLoading(false)
+      if (requestId === workspaceRequestRef.current) setLoading(false)
     }
   }
 
+  async function refreshProjectWorkspace(targetProjectId: string, activeSession = session) {
+    if (!activeSession || !targetProjectId) return
+    const workspace = await fetchProjectWorkspace(activeSession, targetProjectId)
+    setWorkspaces((current) => ({ ...current, [targetProjectId]: workspace }))
+  }
+
   async function loadAI() {
     if (!session || experts.length) return
     try { setExperts(await listAIExperts(session)) } catch (requestError) { setError(errorMessage(requestError)) }
@@ -85,12 +94,13 @@ export function App() {
   }
 
   function logout() {
+    workspaceRequestRef.current += 1
     localStorage.removeItem(SESSION_KEY)
     localStorage.removeItem('senlin-mini-session')
     setSession(null); setUser(null); setProjects([]); setWorkspaces({}); setProjectId(''); setView('tasks')
   }
 
-  if (!session) return <Login onLogin={(next) => { setSession(next); setUser(next.user); persistSession(next) }} />
+  if (!session) return <Login onLogin={(next) => { workspaceRequestRef.current += 1; setProjects([]); setWorkspaces({}); setProjectId(''); setSession(next); setUser(next.user); persistSession(next) }} />
 
   return (
     <div className={`app-shell ${dark ? 'theme-dark' : ''} ${!projectId || workspaceMode === 'explore' ? 'no-rail' : ''}`}>
@@ -109,13 +119,13 @@ export function App() {
           <Select.Option value="all">全部项目</Select.Option>
           {projects.map((project) => <Select.Option key={project.id} value={project.id}>{project.name}</Select.Option>)}
         </Select>
-        <Button type="text" size="mini" shape="circle" aria-label="上一个项目" icon={<IconLeft />} onClick={() => cycleProject(-1)} />
-        <Button type="text" size="mini" shape="circle" aria-label="下一个项目" icon={<IconRight />} onClick={() => cycleProject(1)} />
+        <Button className="project-cycle" type="text" size="mini" shape="circle" aria-label="上一个项目" icon={<IconLeft />} onClick={() => cycleProject(-1)} />
+        <Button className="project-cycle" type="text" size="mini" shape="circle" aria-label="下一个项目" icon={<IconRight />} onClick={() => cycleProject(1)} />
         <Button type="primary" size="mini" shape="circle" aria-label="新建项目" icon={<IconPlus />} onClick={() => setProjectModalOpen(true)} />
       </section>
 
       {error ? <Alert className="app-alert" type="error" content={error} closable onClose={() => setError('')} /> : null}
-      <main className="app-main"><Spin loading={loading} block>{workspaceMode === 'explore' ? <ExplorePanel session={session} projectName={activeProject?.name ?? ''} /> : !projectId ? <AllProjectsHome projects={projects} workspaces={visibleWorkspaces} tasks={tasks} onEditTask={setTaskEditor} onCreateProject={() => setProjectModalOpen(true)} /> : visibleWorkspaces.length ? <Content view={view} title={title} workspaces={visibleWorkspaces} tasks={tasks} onEditTask={setTaskEditor} onLoadAI={loadAI} experts={experts} onUploadDocument={async (file) => { await uploadDocument(session, projectId, file); await loadWorkspaces() }} onCreateMarkdown={async (input) => { await createMarkdownDocument(session, projectId, input); await loadWorkspaces() }} onLoadMarkdown={(documentId) => getDocument(session, projectId, documentId)} onUpdateMarkdown={async (input) => { await updateDocument(session, projectId, input.id, input); await loadWorkspaces() }} onOpenExternalDocument={async (documentId) => { const preview = window.open('', '_blank'); const blob = await fetchDocumentBlob(session, projectId, documentId); const url = URL.createObjectURL(blob); if (preview) { preview.opener = null; preview.location.href = url } else { const link = document.createElement('a'); link.href = url; link.target = '_blank'; link.rel = 'noopener noreferrer'; link.click() } window.setTimeout(() => URL.revokeObjectURL(url), 60_000) }} onCreateAISession={async (input) => { await createAISession(session, projectId, input); await loadWorkspaces() }} /> : <Empty description="项目加载失败，请刷新后重试" />}</Spin></main>
+      <main className="app-main"><Spin loading={loading} block>{workspaceMode === 'explore' ? <ExplorePanel session={session} projectName={activeProject?.name ?? ''} /> : !projectId ? <AllProjectsHome projects={projects} workspaces={visibleWorkspaces} tasks={tasks} onEditTask={setTaskEditor} onCreateProject={() => setProjectModalOpen(true)} /> : visibleWorkspaces.length ? <Content view={view} title={title} workspaces={visibleWorkspaces} tasks={tasks} onEditTask={setTaskEditor} onLoadAI={loadAI} experts={experts} onUploadDocument={async (file) => { await uploadDocument(session, projectId, file); await refreshProjectWorkspace(projectId) }} onCreateMarkdown={async (input) => { await createMarkdownDocument(session, projectId, input); await refreshProjectWorkspace(projectId) }} onLoadMarkdown={(documentId) => getDocument(session, projectId, documentId)} onUpdateMarkdown={async (input) => { await updateDocument(session, projectId, input.id, input); await refreshProjectWorkspace(projectId) }} onOpenExternalDocument={async (documentId) => { const preview = window.open('', '_blank'); try { const blob = await fetchDocumentBlob(session, projectId, documentId); const url = URL.createObjectURL(blob); if (preview) { preview.opener = null; preview.location.href = url } else { const link = document.createElement('a'); link.href = url; link.target = '_blank'; link.rel = 'noopener noreferrer'; link.click() } window.setTimeout(() => URL.revokeObjectURL(url), 60_000) } catch (requestError) { preview?.close(); throw requestError } }} onCreateAISession={async (input) => { await createAISession(session, projectId, input); await refreshProjectWorkspace(projectId) }} /> : <Empty description="项目加载失败，请刷新后重试" />}</Spin></main>
 
       {projectId && workspaceMode === 'workbench' ? <aside className="channel-rail" aria-label="项目子菜单">
         {navItems.map((item) => <button key={item.id} title={item.label} className={view === item.id ? 'active' : ''} onClick={() => { setView(item.id); if (item.id === 'ai') void loadAI() }}>{item.icon}<span>{item.label}</span></button>)}
@@ -124,7 +134,7 @@ export function App() {
       <TaskEditor task={taskEditor} tags={visibleWorkspaces.flatMap((workspace) => workspace.tags.map((tag) => tag.name))} onClose={() => setTaskEditor(null)} onSave={async (draft) => {
         if (!taskEditor) return
         await updateTask(session, taskEditor.projectId, taskEditor.id, { title: draft.title, description: draft.summary, tag: draft.tag, completed: draft.completed })
-        await loadWorkspaces()
+        await refreshProjectWorkspace(taskEditor.projectId)
         setTaskEditor(null)
       }} />
       <ProjectModal visible={projectModalOpen} onClose={() => setProjectModalOpen(false)} onSave={async (name) => {
@@ -271,24 +281,25 @@ function Panel({ title, subtitle, children }: { title: string; subtitle: string;
 
 function ProfileMenu({ user, onProfile, onLogout }: { user: CurrentUser | null; onProfile: () => void; onLogout: () => void }) {
   const menu = <Menu><Menu.Item key="profile" onClick={onProfile}>修改资料</Menu.Item><Menu.Item key="logout" onClick={onLogout}>退出登录</Menu.Item></Menu>
-  return <Dropdown droplist={menu} position="br" trigger="click"><button className="profile-trigger"><Avatar size={28}>{user?.displayName.slice(0, 1) || <IconUser />}</Avatar><span>{user?.displayName || '用户'}</span><IconDown /></button></Dropdown>
+  return <Dropdown droplist={menu} position="br" trigger="click"><button className="profile-trigger" aria-label={`用户菜单，${user?.displayName || '用户'}`}><Avatar size={28}>{user?.displayName.slice(0, 1) || <IconUser />}</Avatar><span>{user?.displayName || '用户'}</span><IconDown /></button></Dropdown>
 }
 
 function TaskEditor({ task, tags, onClose, onSave }: { task: TaskWithProject | null; tags: string[]; onClose: () => void; onSave: (draft: { title: string; summary: string; tag: string; completed: boolean }) => Promise<void> }) {
-  const [title, setTitle] = useState(''); const [summary, setSummary] = useState(''); const [tag, setTag] = useState(''); const [completed, setCompleted] = useState(false); const [saving, setSaving] = useState(false)
-  useEffect(() => { if (task) { setTitle(task.title); setSummary(task.summary); setTag(task.tag); setCompleted(task.completed) } }, [task])
-  return <Modal title="编辑任务" visible={Boolean(task)} onCancel={onClose} confirmLoading={saving} onOk={async () => { if (!title.trim()) return; setSaving(true); try { await onSave({ title: title.trim(), summary: summary.trim(), tag, completed }) } finally { setSaving(false) } }}><Form layout="vertical"><Form.Item label="标题" required><Input value={title} onChange={setTitle} /></Form.Item><Form.Item label="说明"><Input.TextArea value={summary} onChange={setSummary} autoSize={{ minRows: 3, maxRows: 6 }} /></Form.Item><Form.Item label="标签"><Select value={tag || undefined} allowClear onChange={(value) => setTag(value ?? '')}>{[...new Set(tags.filter(Boolean))].map((item) => <Select.Option key={item} value={item}>{item}</Select.Option>)}</Select></Form.Item><Form.Item label="完成状态"><Switch checked={completed} checkedText="已完成" uncheckedText="待办" onChange={setCompleted} /></Form.Item></Form></Modal>
+  const [title, setTitle] = useState(''); const [summary, setSummary] = useState(''); const [tag, setTag] = useState(''); const [completed, setCompleted] = useState(false); const [saving, setSaving] = useState(false); const [error, setError] = useState('')
+  useEffect(() => { if (task) { setTitle(task.title); setSummary(task.summary); setTag(task.tag); setCompleted(task.completed); setError('') } }, [task])
+  return <Modal title="编辑任务" visible={Boolean(task)} onCancel={onClose} confirmLoading={saving} onOk={async () => { if (!title.trim()) return; setSaving(true); setError(''); try { await onSave({ title: title.trim(), summary: summary.trim(), tag, completed }) } catch (requestError) { setError(errorMessage(requestError)) } finally { setSaving(false) } }}><Form layout="vertical">{error ? <Alert type="error" content={error} /> : null}<Form.Item label="标题" required><Input value={title} onChange={setTitle} /></Form.Item><Form.Item label="说明"><Input.TextArea value={summary} onChange={setSummary} autoSize={{ minRows: 3, maxRows: 6 }} /></Form.Item><Form.Item label="标签"><Select value={tag || undefined} allowClear onChange={(value) => setTag(value ?? '')}>{[...new Set(tags.filter(Boolean))].map((item) => <Select.Option key={item} value={item}>{item}</Select.Option>)}</Select></Form.Item><Form.Item label="完成状态"><Switch checked={completed} checkedText="已完成" uncheckedText="待办" onChange={completed => setCompleted(completed)} /></Form.Item></Form></Modal>
 }
 
 function ProjectModal({ visible, onClose, onSave }: { visible: boolean; onClose: () => void; onSave: (name: string) => Promise<void> }) {
-  const [name, setName] = useState(''); const [saving, setSaving] = useState(false)
-  return <Modal title="新建项目" visible={visible} onCancel={onClose} confirmLoading={saving} onOk={async () => { if (!name.trim()) return; setSaving(true); try { await onSave(name.trim()); setName('') } finally { setSaving(false) } }}><Input autoFocus placeholder="项目名称" value={name} onChange={setName} /></Modal>
+  const [name, setName] = useState(''); const [saving, setSaving] = useState(false); const [error, setError] = useState('')
+  useEffect(() => { if (visible) setError('') }, [visible])
+  return <Modal title="新建项目" visible={visible} onCancel={onClose} confirmLoading={saving} onOk={async () => { if (!name.trim()) return; setSaving(true); setError(''); try { await onSave(name.trim()); setName('') } catch (requestError) { setError(errorMessage(requestError)) } finally { setSaving(false) } }}>{error ? <Alert type="error" content={error} /> : null}<Input autoFocus placeholder="项目名称" value={name} onChange={setName} /></Modal>
 }
 
 function ProfileModal({ user, visible, onClose, onSave }: { user: CurrentUser | null; visible: boolean; onClose: () => void; onSave: (input: { displayName: string; currentPassword?: string; newPassword?: string }) => Promise<void> }) {
-  const [displayName, setDisplayName] = useState(user?.displayName ?? ''); const [currentPassword, setCurrentPassword] = useState(''); const [newPassword, setNewPassword] = useState(''); const [saving, setSaving] = useState(false)
-  useEffect(() => setDisplayName(user?.displayName ?? ''), [user])
-  return <Modal title="修改资料" visible={visible} onCancel={onClose} confirmLoading={saving} onOk={async () => { setSaving(true); try { await onSave({ displayName, currentPassword: currentPassword || undefined, newPassword: newPassword || undefined }); setCurrentPassword(''); setNewPassword('') } finally { setSaving(false) } }}><Form layout="vertical"><Form.Item label="名称" required><Input value={displayName} onChange={setDisplayName} /></Form.Item><Form.Item label="邮箱"><Input disabled value={user?.email} /></Form.Item><Form.Item label="当前密码"><Input.Password value={currentPassword} onChange={setCurrentPassword} placeholder="修改密码时必填" /></Form.Item><Form.Item label="新密码"><Input.Password value={newPassword} onChange={setNewPassword} placeholder="不修改可留空" /></Form.Item></Form></Modal>
+  const [displayName, setDisplayName] = useState(user?.displayName ?? ''); const [currentPassword, setCurrentPassword] = useState(''); const [newPassword, setNewPassword] = useState(''); const [saving, setSaving] = useState(false); const [error, setError] = useState('')
+  useEffect(() => { setDisplayName(user?.displayName ?? ''); if (visible) setError('') }, [user, visible])
+  return <Modal title="修改资料" visible={visible} onCancel={onClose} confirmLoading={saving} onOk={async () => { if (!displayName.trim()) return; setSaving(true); setError(''); try { await onSave({ displayName: displayName.trim(), currentPassword: currentPassword || undefined, newPassword: newPassword || undefined }); setCurrentPassword(''); setNewPassword('') } catch (requestError) { setError(errorMessage(requestError)) } finally { setSaving(false) } }}><Form layout="vertical">{error ? <Alert type="error" content={error} /> : null}<Form.Item label="名称" required><Input value={displayName} onChange={setDisplayName} /></Form.Item><Form.Item label="邮箱"><Input disabled value={user?.email} /></Form.Item><Form.Item label="当前密码"><Input.Password value={currentPassword} onChange={setCurrentPassword} placeholder="修改密码时必填" /></Form.Item><Form.Item label="新密码"><Input.Password value={newPassword} onChange={setNewPassword} placeholder="不修改可留空" /></Form.Item></Form></Modal>
 }
 
 function Login({ onLogin }: { onLogin: (session: ApiSession & { user: CurrentUser }) => void }) {
diff --git a/apps/desktop/src/styles.css b/apps/desktop/src/styles.css
index 869b6d3..d4e5ff8 100644
--- a/apps/desktop/src/styles.css
+++ b/apps/desktop/src/styles.css
@@ -94,4 +94,4 @@ button { font: inherit; }
 .login-page { display: grid; min-height: 100vh; place-items: center; padding: 20px; background: #edf2f9; }.login-card { display: grid; width: min(100%, 360px); gap: 12px; padding: 28px; border: 1px solid #e5e6eb; border-radius: 16px; background: #fff; box-shadow: 0 18px 48px rgba(31, 35, 41, .12); }.login-card > img { width: 34px; }.login-card .arco-typography { margin: 0; }.login-card label { display: grid; gap: 5px; color: #4e5969; font-size: 12px; }
 .theme-dark .project-strip, .theme-dark .app-header, .theme-dark .task-section, .theme-dark .detail-row, .theme-dark .tag-filter button { color: var(--text); background: var(--surface); }.theme-dark .project-pill { color: var(--muted); }.theme-dark .project-pill.active, .theme-dark .channel-rail button.active { color: #8ac7ff; background: #1d4d77; }.theme-dark .task-row:hover { background: #293847; border-color: #477da7; }.theme-dark .section-label span { color: #8ac7ff; background: #1d4d77; }
 
-@media (max-width: 360px) { .profile-trigger > span { display: none; }.project-pill { max-width: 90px; }.project-strip { gap: 2px; padding-inline: 5px; }.app-main { padding: 13px 9px 20px; }.project-page-header { width: calc(100% + 18px); margin: -13px -9px 15px; padding: 17px 9px 14px; }.document-actions { width: 100%; justify-content: flex-start; }.document-actions .arco-btn { padding-inline: 8px; }.task-meta .arco-tag { max-width: 64px; overflow: hidden; }.content-heading h4 { font-size: 18px; }.stat-grid { grid-template-columns: repeat(2, 1fr); } }
+@media (max-width: 360px) { .profile-trigger > span, .project-cycle { display: none; }.project-pill { max-width: 90px; }.project-strip { gap: 2px; padding-inline: 5px; }.app-main { padding: 13px 9px 20px; }.project-page-header { width: calc(100% + 18px); margin: -13px -9px 15px; padding: 17px 9px 14px; }.document-actions { width: 100%; justify-content: flex-start; }.document-actions .arco-btn { padding-inline: 8px; }.task-meta .arco-tag { max-width: 64px; overflow: hidden; }.content-heading h4 { font-size: 18px; }.stat-grid { grid-template-columns: repeat(2, 1fr); } }