feat(mobile): 小屏收起侧栏，页头菜单按钮打开分组导航抽屉

- ≤820 隐藏整个侧栏（资料卡 / 本地服务 / 导航都收起），主内容直接顶上来
- 页头新增只在手机显示的菜单按钮，打开左侧抽屉：分组导航 Menu，选中后自动关闭并跳转
- 抽屉带遮罩、Esc 关闭、打开时锁住背后滚动；桌面不显示按钮

stash-web/src/App.css

@@ -860,9 +860,8 @@
 }
 
 @media (max-width: 820px) {
-  /* 手机上只留分组导航：资料卡 / 本地服务卡太占地，导航还留着方便进分组 */
-  #page-scroll > aside .profile-card,
-  #page-scroll > aside .service-panel {
+  /* 手机上侧栏整体收起，分组导航改由页头的菜单按钮打开抽屉 */
+  #page-scroll > aside {
     display: none;
   }
 
@@ -1657,3 +1656,70 @@ html.theme-transition .site-background {
     display: block;
   }
 }
+
+/* ---------- 小屏分组导航抽屉 ---------- */
+
+/* 桌面不显示菜单按钮（抽屉只能从小屏页头打开） */
+.header-nav-toggle {
+  display: none;
+}
+
+.nav-drawer {
+  position: fixed;
+  inset: 0;
+  z-index: calc(var(--su-z-header) + 10);
+  display: flex;
+}
+
+.nav-drawer-backdrop {
+  position: absolute;
+  inset: 0;
+  border: none;
+  background: rgba(0, 0, 0, 0.45);
+  cursor: pointer;
+}
+
+.nav-drawer-panel {
+  position: relative;
+  display: flex;
+  flex-direction: column;
+  gap: var(--su-space-3);
+  width: min(86vw, 340px);
+  height: 100%;
+  margin-right: auto;
+  padding: var(--su-space-4);
+  background-color: var(--su-bg-card);
+  box-shadow: var(--su-shadow-pop);
+  overflow-y: auto;
+  animation: nav-drawer-in 180ms var(--su-ease-out);
+}
+
+.nav-drawer-head {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--su-space-2);
+}
+
+@keyframes nav-drawer-in {
+  from {
+    transform: translateX(-100%);
+  }
+
+  to {
+    transform: none;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .nav-drawer-panel {
+    animation: none;
+  }
+}
+
+@media (max-width: 820px) {
+  /* 手机页头才显示菜单按钮（必须写在上面的 display: none 之后） */
+  .header-nav-toggle {
+    display: inline-flex;
+  }
+}

stash-web/src/AppNext.tsx

@@ -3,11 +3,14 @@ import {
   Card,
   Empty,
   EngineIcon,
+  Icon,
+  IconButton,
   Layout,
   Menu,
   Notice,
   SearchField,
   Space,
+  Title,
   Toaster,
   type EngineIconName,
   type MenuItem,
@@ -240,6 +243,8 @@ export default function AppNext() {
   const [loginOpen, setLoginOpen] = useState(false)
   const [editingKey, setEditingKey] = useState<string | null>(null)
   const [scrolled, setScrolled] = useState(false)
+  /** 小屏的分组导航抽屉 */
+  const [navOpen, setNavOpen] = useState(false)
   const searchRef = useRef<HTMLInputElement>(null)
   const [searchEngineId, setSearchEngineId] = useState<string | null>(readSearchEngine)
   const [engineOpen, setEngineOpen] = useState(false)
@@ -552,6 +557,29 @@ export default function AppNext() {
         ? `g:${route.key}`
         : `g:${route.key}`
 
+  /** 侧栏与手机抽屉共用：选完分组就关掉抽屉 */
+  const selectNav = (key: string) => {
+    setNavOpen(false)
+    if (key === 'home') navigate('/')
+    else navigate(`/g/${encodeURIComponent(key.slice(2))}`)
+  }
+
+  useEffect(() => {
+    if (!navOpen) return
+    const onKey = (event: KeyboardEvent) => {
+      if (event.key === 'Escape') setNavOpen(false)
+    }
+    // 抽屉打开时锁住背后的滚动
+    const scroll = document.getElementById('page-scroll')
+    const previous = scroll?.style.overflowY ?? ''
+    if (scroll !== null) scroll.style.overflowY = 'hidden'
+    window.addEventListener('keydown', onKey)
+    return () => {
+      window.removeEventListener('keydown', onKey)
+      if (scroll !== null) scroll.style.overflowY = previous
+    }
+  }, [navOpen])
+
   function renderEntries(
     group: GroupNode,
     entries: Record<string, unknown>[],
@@ -886,6 +914,7 @@ export default function AppNext() {
               void logout().then(() => setSession({ authenticated: false, has_admin: true }))
             }}
             onSettings={() => window.location.assign('/admin')}
+            onOpenNav={() => setNavOpen(true)}
           />
         }
         toolbar={
@@ -983,10 +1012,7 @@ export default function AppNext() {
                     items={sidebarItems}
                     activeKey={activeKey}
                     itemHeight={39}
-                    onSelect={(key) => {
-                      if (key === 'home') navigate('/')
-                      else navigate(`/g/${encodeURIComponent(key.slice(2))}`)
-                    }}
+                    onSelect={selectNav}
                   />
                 </div>
               )}
@@ -1015,6 +1041,30 @@ export default function AppNext() {
       </Layout>
 
       <BackToTop visible={scrolled} targetId="page-scroll" />
+
+      {navOpen && (
+        <div className="nav-drawer">
+          <button
+            type="button"
+            className="nav-drawer-backdrop"
+            aria-label="关闭分组导航"
+            onClick={() => setNavOpen(false)}
+          />
+          <div className="nav-drawer-panel" role="dialog" aria-modal="true" aria-label="分组导航">
+            <div className="nav-drawer-head">
+              <Title level={4} as="h2" weight="semibold">
+                分组导航
+              </Title>
+              <IconButton
+                label="关闭分组导航"
+                icon={<Icon name="close_line" />}
+                onClick={() => setNavOpen(false)}
+              />
+            </div>
+            <Menu items={sidebarItems} activeKey={activeKey} itemHeight={44} onSelect={selectNav} />
+          </div>
+        </div>
+      )}
     </>
   )
 }

stash-web/src/components/header/SiteHeader.tsx

@@ -39,6 +39,8 @@ type SiteHeaderProps = {
   onLogin: () => void
   onLogout: () => void
   onSettings: () => void
+  /** 小屏打开分组导航抽屉；不传则不显示菜单按钮 */
+  onOpenNav?: () => void
 }
 
 const tagTone: Record<SettingsTone, 'neutral' | 'primary' | 'success'> = {
@@ -67,6 +69,7 @@ export function SiteHeader({
   onLogin,
   onLogout,
   onSettings,
+  onOpenNav,
 }: SiteHeaderProps) {
   const context = { count: projectCount, project: sampleProject, live }
 
@@ -97,6 +100,14 @@ export function SiteHeader({
       </div>
 
       <div className="header-actions">
+        {onOpenNav !== undefined && (
+          <IconButton
+            className="header-nav-toggle"
+            label="分组导航"
+            icon={<Icon name="menu_line" />}
+            onClick={onOpenNav}
+          />
+        )}
         {ready && (
           <>
             {site.actions.theme && (