feat(ui): add collapsible persistent sidebar

src/app/App.tsx

@@ -78,17 +78,46 @@ function App() {
   }, [settings, settingsLoaded])
 
   const isMobile = useIsMobile()
-  const [sidebarCollapsed, setSidebarCollapsed] = useState(false)
+  const setSetting = useSettingsStore((state) => state.setSetting)
+  const [sidebarCollapsed, setSidebarCollapsed] = useState(settings.sidebarCollapsed)
   const [mobileSidebarOpen, setMobileSidebarOpen] = useState(false)
 
   useEffect(() => {
     if (isMobile) {
       setSidebarCollapsed(true)
-    } else {
-      setSidebarCollapsed(false)
-      setMobileSidebarOpen(false)
+      return
     }
-  }, [isMobile])
+    setMobileSidebarOpen(false)
+    if (settingsLoaded) {
+      setSidebarCollapsed(settings.sidebarCollapsed)
+    }
+  }, [isMobile, settingsLoaded, settings.sidebarCollapsed])
+
+  const toggleSidebar = useCallback(() => {
+    if (isMobile) {
+      setMobileSidebarOpen((prev) => !prev)
+      return
+    }
+    setSidebarCollapsed((prev) => {
+      const next = !prev
+      void setSetting('sidebarCollapsed', next)
+      return next
+    })
+  }, [isMobile, setSetting])
+
+  const toggleMobileSidebar = useCallback(() => {
+    setMobileSidebarOpen((prev) => !prev)
+  }, [])
+
+  const closeMobileSidebar = useCallback(() => {
+    setMobileSidebarOpen(false)
+  }, [])
+
+  useEffect(() => {
+    const handleToggleSidebar = () => toggleSidebar()
+    window.addEventListener('opsxshell:toggle-sidebar', handleToggleSidebar)
+    return () => window.removeEventListener('opsxshell:toggle-sidebar', handleToggleSidebar)
+  }, [toggleSidebar])
 
   // Keep renderer state authoritative when the native SSH service closes a
   // connection (network loss, keepalive failure, or remote shell failure).
@@ -112,14 +141,6 @@ function App() {
     }
   }, [])
 
-  const toggleMobileSidebar = useCallback(() => {
-    setMobileSidebarOpen((prev) => !prev)
-  }, [])
-
-  const closeMobileSidebar = useCallback(() => {
-    setMobileSidebarOpen(false)
-  }, [])
-
   const handleOpenSettings = useCallback(() => {
     useTabStore.getState().addTab({ title: '设置', type: 'settings' })
   }, [])
@@ -361,6 +382,7 @@ function App() {
       isMobile={isMobile}
       sidebarCollapsed={sidebarCollapsed}
       mobileSidebarOpen={mobileSidebarOpen}
+      onToggleSidebar={toggleSidebar}
       onToggleMobileSidebar={toggleMobileSidebar}
       onCloseMobileSidebar={closeMobileSidebar}
       onNewSession={openNewSession}

src/app/AppShell.tsx

@@ -8,6 +8,7 @@
  */
 
 import type { ReactNode } from 'react'
+import { PanelLeft } from 'lucide-react'
 import Sidebar from '../components/layout/Sidebar'
 import TabBar from '../components/layout/TabBar'
 import TabContent from '../components/layout/TabContent'
@@ -20,6 +21,7 @@ export interface AppShellProps {
   isMobile: boolean
   sidebarCollapsed: boolean
   mobileSidebarOpen: boolean
+  onToggleSidebar: () => void
   onToggleMobileSidebar: () => void
   onCloseMobileSidebar: () => void
   onNewSession: () => void
@@ -63,11 +65,26 @@ function MobileMenuButton({ onClick }: { onClick: () => void }) {
   )
 }
 
+function ExpandSidebarButton({ onClick }: { onClick: () => void }) {
+  return (
+    <button
+      type="button"
+      onClick={onClick}
+      className="titlebar-no-drag flex h-10 w-10 flex-shrink-0 items-center justify-center border-r border-dark-700/40 text-txt-muted transition-colors hover:bg-dark-700/60 hover:text-content-primary"
+      title="展开侧栏 (Ctrl/Cmd+B)"
+      aria-label="展开侧栏"
+    >
+      <PanelLeft className="h-4 w-4" />
+    </button>
+  )
+}
+
 export default function AppShell({
   activeTabId,
   isMobile,
   sidebarCollapsed,
   mobileSidebarOpen,
+  onToggleSidebar,
   onToggleMobileSidebar,
   onCloseMobileSidebar,
   onNewSession,
@@ -91,6 +108,8 @@ export default function AppShell({
     if (isMobile) onCloseMobileSidebar()
   }
 
+  const desktopSidebarHidden = !isMobile && sidebarCollapsed
+
   return (
     <div className="flex h-screen flex-col overflow-hidden bg-dark-900 text-content-primary">
       <TitleBar />
@@ -105,24 +124,27 @@ export default function AppShell({
         )}
 
         <aside
-          className={`titlebar-no-drag h-full flex-shrink-0 transition-all duration-300 ease-in-out ${
+          className={`titlebar-no-drag h-full flex-shrink-0 transition-[width,transform] duration-200 ease-in-out ${
             isMobile
               ? `fixed inset-y-0 left-0 top-10 z-50 ${mobileSidebarOpen ? 'translate-x-0' : '-translate-x-full'}`
-              : sidebarCollapsed
-                ? 'w-0 overflow-hidden'
+              : desktopSidebarHidden
+                ? 'w-0 overflow-hidden border-0'
                 : ''
           } `}
+          aria-hidden={desktopSidebarHidden}
         >
           <Sidebar
             onNewSession={handleSidebarNewSession}
             onQuickConnect={handleSidebarQuickConnect}
             onEditSession={handleSidebarEditSession}
+            onCollapse={isMobile ? undefined : onToggleSidebar}
           />
         </aside>
 
         <main className="flex min-w-0 flex-1 flex-col bg-dark-800">
           <div className="flex items-stretch">
             {isMobile && <MobileMenuButton onClick={onToggleMobileSidebar} />}
+            {desktopSidebarHidden && <ExpandSidebarButton onClick={onToggleSidebar} />}
             <div className="min-w-0 flex-1">
               <TabBar onOpenLauncher={onOpenLauncher} />
             </div>

src/components/common/CommandPalette.tsx

@@ -17,6 +17,7 @@ import {
   ChevronRight,
   Settings,
   Laptop,
+  PanelLeft,
 } from 'lucide-react'
 import { useTabStore } from '../../stores/tabStore'
 import { useSessionStore, useSnippetStore, useCommandPaletteStore, type Session } from '../../stores'
@@ -108,6 +109,15 @@ export function CommandPalette({
         icon: <Settings size={16} />,
         action: () => onOpenSettings(),
       },
+      {
+        id: 'cmd:toggle-sidebar',
+        type: 'command',
+        label: '折叠/展开侧栏',
+        description: '隐藏侧栏以专心操作终端',
+        shortcut: 'Ctrl+B',
+        icon: <PanelLeft size={16} />,
+        action: () => window.dispatchEvent(new CustomEvent('opsxshell:toggle-sidebar')),
+      },
       {
         id: 'cmd:new-tab',
         type: 'command',

src/components/layout/Sidebar.tsx

@@ -4,7 +4,7 @@
  */
 
 import { useState, useEffect, useRef, useCallback } from 'react'
-import { Plus, Zap, Server, Settings, ListChecks, Terminal, FolderSync, X, TerminalSquare } from 'lucide-react'
+import { Plus, Zap, Settings, ListChecks, Terminal, FolderSync, X, TerminalSquare, PanelLeftClose } from 'lucide-react'
 import { useSessionStore, Session } from '../../stores'
 import { useSettingsStore } from '../../stores/settingsStore'
 import { useTabStore } from '../../stores/tabStore'
@@ -12,6 +12,7 @@ import { SessionTree } from './sidebar/SessionTree'
 import { SearchBox } from './sidebar/SearchBox'
 import { useConfirmDialog } from '../common/ConfirmDialog'
 import BatchCommandDialog from '../sessions/BatchCommandDialog'
+import appIconUrl from '../../assets/opsxshell-app-icon.png'
 
 const MIN_SIDEBAR_WIDTH = 180
 const MAX_SIDEBAR_WIDTH = 400
@@ -20,9 +21,10 @@ interface SidebarProps {
   onNewSession: () => void
   onQuickConnect: () => void
   onEditSession: (session: Session) => void
+  onCollapse?: () => void
 }
 
-export default function Sidebar({ onNewSession, onQuickConnect, onEditSession }: SidebarProps) {
+export default function Sidebar({ onNewSession, onQuickConnect, onEditSession, onCollapse }: SidebarProps) {
   const { sessions, setSessions, addSession, removeSession } = useSessionStore()
   const { settings, setSetting } = useSettingsStore()
   const { addTab } = useTabStore()
@@ -259,15 +261,31 @@ export default function Sidebar({ onNewSession, onQuickConnect, onEditSession }:
         {/* Header */}
         <div className="p-3.5 border-b border-dark-700/30">
           <div className="flex items-center gap-2.5 mb-3.5 px-0.5">
-            <div className="w-8 h-8 bg-gradient-to-br from-accent-blue to-accent-blue/70 rounded-lg flex items-center justify-center shadow-sm shadow-accent-blue/25">
-              <Server className="w-4 h-4 text-white" />
-            </div>
-            <div className="min-w-0">
+            <img
+              src={appIconUrl}
+              alt="OpsXShell"
+              width={32}
+              height={32}
+              className="h-8 w-8 flex-shrink-0 rounded-[9px] object-cover"
+              draggable={false}
+            />
+            <div className="min-w-0 flex-1">
               <div className="font-semibold text-sm text-content-primary tracking-tight leading-none">
                 OpsXShell
               </div>
-              <div className="text-[10px] text-txt-faint mt-1">远程运维工作台</div>
+              <div className="text-[10px] text-txt-faint mt-1">SSH / SFTP 终端</div>
             </div>
+            {onCollapse && (
+              <button
+                type="button"
+                onClick={onCollapse}
+                title="折叠侧栏 (Ctrl/Cmd+B)"
+                aria-label="折叠侧栏"
+                className="flex h-8 w-8 flex-shrink-0 items-center justify-center rounded-lg text-txt-muted transition-colors hover:bg-dark-700 hover:text-content-primary"
+              >
+                <PanelLeftClose className="h-4 w-4" />
+              </button>
+            )}
           </div>
 
           <div className="flex gap-1.5">
@@ -414,9 +432,14 @@ export default function Sidebar({ onNewSession, onQuickConnect, onEditSession }:
         )}
       </div>
 
-      {/* Resize Handle */}
+      {/* Resize Handle — 双击也可折叠 */}
       <div
         onMouseDown={handleResizeStart}
+        onDoubleClick={(e) => {
+          e.preventDefault()
+          onCollapse?.()
+        }}
+        title="拖拽调整宽度，双击折叠"
         className={`
           absolute top-0 right-0 bottom-0 w-1 cursor-col-resize
           hover:bg-accent-blue/50 active:bg-accent-blue/70

src/components/sessions/WelcomeView.tsx

@@ -1,8 +1,9 @@
-import { Terminal, Plus, Zap, Clock, Server, ChevronRight } from 'lucide-react'
+import { Plus, Zap, Clock, Server, ChevronRight } from 'lucide-react'
 import { useSessionStore } from '../../stores'
 import { useTabStore } from '../../stores/tabStore'
 import EmptyState from '../common/EmptyState'
 import LocalShellMenu from '../layout/sidebar/LocalShellMenu'
+import appIconUrl from '../../assets/opsxshell-app-icon.png'
 
 interface WelcomeViewProps {
   onNewSession?: () => void
@@ -27,12 +28,17 @@ export default function WelcomeView({ onNewSession, onQuickConnect }: WelcomeVie
       <div className="w-full max-w-3xl px-6 py-10 sm:py-12">
         {/* Hero — 短文案 */}
         <div className="flex items-center gap-4 mb-8">
-          <div className="w-14 h-14 rounded-2xl bg-gradient-to-br from-accent-blue/30 to-accent-purple/20 border border-dark-600/60 flex items-center justify-center shadow-lg shadow-black/20 flex-shrink-0">
-            <Terminal className="w-7 h-7 text-content-primary" />
-          </div>
+          <img
+            src={appIconUrl}
+            alt="OpsXShell"
+            width={56}
+            height={56}
+            className="h-14 w-14 flex-shrink-0 rounded-2xl object-cover shadow-lg shadow-black/20"
+            draggable={false}
+          />
           <div className="min-w-0">
             <h1 className="text-2xl font-semibold text-content-primary tracking-tight">OpsXShell</h1>
-            <p className="text-sm text-txt-muted mt-0.5">SSH / SFTP 跨平台运维工作台</p>
+            <p className="text-sm text-txt-muted mt-0.5">SSH / SFTP 终端</p>
           </div>
         </div>
 

src/components/settings/SettingsView.tsx

@@ -216,6 +216,23 @@ export default function SettingsView() {
                   <span className="w-12 text-right text-xs tabular-nums text-txt-muted">{settings.sidebarWidth}px</span>
                 </div>
               </SettingRow>
+              <SettingRow label="折叠侧栏" description="隐藏会话树以专心操作终端，可用 Ctrl/Cmd+B 切换">
+                <button
+                  type="button"
+                  role="switch"
+                  aria-checked={settings.sidebarCollapsed}
+                  onClick={() => setSetting('sidebarCollapsed', !settings.sidebarCollapsed)}
+                  className={`relative h-6 w-11 rounded-full transition-colors ${
+                    settings.sidebarCollapsed ? 'bg-accent-blue' : 'bg-dark-600'
+                  }`}
+                >
+                  <span
+                    className={`absolute top-0.5 left-0.5 h-5 w-5 rounded-full bg-white transition-transform ${
+                      settings.sidebarCollapsed ? 'translate-x-5' : 'translate-x-0'
+                    }`}
+                  />
+                </button>
+              </SettingRow>
             </SettingGroup>
           </div>
         )

src/constants/keybindings.ts

@@ -16,6 +16,7 @@ export const KeybindingAction = {
 
   // 视图
   VIEW_FULLSCREEN: 'view.fullscreen',
+  VIEW_TOGGLE_SIDEBAR: 'view.toggleSidebar',
 
   // 会话
   SESSION_NEW: 'session.new',
@@ -95,6 +96,13 @@ export const KEYBINDING_DEFINITIONS: KeybindingDefinition[] = [
     defaultKeys: 'F11',
     fireInInput: true,
   },
+  {
+    id: KeybindingAction.VIEW_TOGGLE_SIDEBAR,
+    label: '折叠/展开侧栏',
+    category: KeybindingCategory.VIEW,
+    defaultKeys: 'Ctrl+B',
+    fireInInput: true,
+  },
   {
     id: KeybindingAction.SESSION_NEW,
     label: '新建会话',

src/hooks/useKeyboardShortcuts.ts

@@ -9,6 +9,7 @@
  * - Ctrl+1~9: 跳转到指定索引标签
  * - Ctrl+W: 关闭当前标签
  * - F11: 全屏切换
+ * - Ctrl/Cmd+B: 折叠/展开侧栏
  * - Ctrl+Shift+N: 新建标签
  * - Ctrl+Shift+P: 打开命令面板
  * - Ctrl+N: 新建会话
@@ -125,6 +126,7 @@ function shouldFireInInput(e: KeyboardEvent): boolean {
     KeybindingAction.TAB_PREV,
     KeybindingAction.TAB_GOTO_N,
     KeybindingAction.VIEW_FULLSCREEN,
+    KeybindingAction.VIEW_TOGGLE_SIDEBAR,
     KeybindingAction.TOOLS_COMMAND_PALETTE,
   ]
 
@@ -202,6 +204,13 @@ export function useKeyboardShortcuts(): void {
         return
       }
 
+      // ---- Ctrl/Cmd+B: 折叠侧栏 ----
+      if (matchesKeySequence(e, keys[KeybindingAction.VIEW_TOGGLE_SIDEBAR])) {
+        e.preventDefault()
+        window.dispatchEvent(new CustomEvent('opsxshell:toggle-sidebar'))
+        return
+      }
+
       // ---- 以下快捷键在输入框中不触发 (除非 fireInInput=true) ----
       if (isInputElement(e) && !shouldFireInInput(e)) {
         return

src/stores/settingsStore.ts

@@ -12,6 +12,8 @@ export interface AppSettings {
   // 外观
   theme: 'dark' | 'light' | 'system'
   sidebarWidth: number
+  /** 桌面侧栏是否折叠（专心终端） */
+  sidebarCollapsed: boolean
 
   // 终端
   fontFamily: string
@@ -41,6 +43,7 @@ export interface AppSettings {
 const defaultSettings: AppSettings = {
   theme: 'dark',
   sidebarWidth: 256,
+  sidebarCollapsed: false,
   // Prefer Nerd Font so local zsh powerline prompts render correctly
   fontFamily: 'MesloLGS NF',
   fontSize: 14,