feat(mobile): Sidebar drawer <1024px + Modal/Sheet fullscreen <880px

Per design_handoff_ordinis_mdm/README.md responsive table (line 464-465):
- ≤1024px: Sidebar becomes overlay drawer (hamburger в TopBar)
- ≤880px:  Drawers и modals fullscreen (100vw × 100dvh, no border-radius)

Implementation:

src/components/layout/Sidebar.tsx
  - Extracted SidebarContent (logo + nav + user block) для DRY
  - Desktop <Sidebar /> wraps SidebarContent в hidden lg:flex aside
  - New <MobileSidebar open onClose /> — Sheet с тем же содержимым,
    260px wide, slides from left
  - SidebarLink принимает onClick → drawer auto-close при navigate

src/components/layout/TopBar.tsx
  - Optional onMenuClick prop — рендерит hamburger button (Menu icon
    из lucide-react) с lg:hidden
  - VersionBadge скрыт <md (768px) — diagnostic info, не critical UX

src/routes/__root.tsx
  - useState mobileNavOpen, передаём в MobileSidebar + TopBar

src/ui/components/dialog.tsx
  - SIZE_CLASSES получили  prefix (arbitrary Tailwind v4
    breakpoint per handoff exact 880px). На mobile <880px modal становится
    fullscreen (inset-0 w-full h-full no rounded), ≥880px — centered с
    translate + max-w из SIZE_CLASSES.

src/ui/components/sheet.tsx
  - size variants: sm:max-w-* → min-[880px]:max-w-*. На mobile <880px
    sheet берёт w-full (fullscreen drawer per handoff).

src/components/record/RecordDrawer.tsx
  - max-width переключатель 520/880 теперь применяется только ≥880px.
    На mobile drawer всегда fullscreen.

src/ui/components/language-switch.tsx
  - Display fallback: opt.short → opt.label → uppercase id.
    Previously показывал id ('ru-RU', 'en-US') когда short не был задан —
    теперь использует label ('RU', 'EN') как fallback.

Browser-verified в preview viewport 375×812:
  - Hamburger ☰ visible, click открывает Sheet с nav items
  - Backdrop fade + slide-from-left animation
  - TopBar fits в 375px (RU/EN compact, Sign in visible)
  - LoadingBlock + Alert text-wrap correctly

ordinis-admin-ui/src/components/layout/Sidebar.tsx

@@ -15,6 +15,7 @@ import {
 import { useAuth } from 'react-oidc-context'
 import { useCanMutate } from '@/auth/useCanMutate'
 import { useDictionaries, useMyDrafts } from '@/api/queries'
+import { Sheet, SheetContent } from '@/ui'
 import { cn } from '@/lib/utils'
 
 /**
@@ -114,24 +115,47 @@ export function Sidebar() {
 
   return (
     <aside className="hidden lg:flex w-[220px] shrink-0 flex-col border-r border-line bg-surface">
+      <SidebarContent sections={visibleSections} auth={auth} />
+    </aside>
+  )
+}
+
+/**
+ * SidebarContent — внутренности (logo + nav + user). Используется в desktop
+ * rail (Sidebar) И в mobile drawer (MobileSidebar) — DRY.
+ */
+function SidebarContent({
+  sections,
+  auth,
+  onNavigate,
+}: {
+  sections: NavSection[]
+  auth: ReturnType<typeof useAuth>
+  /** Called после клика на nav item — для close drawer в mobile mode. */
+  onNavigate?: () => void
+}) {
+  return (
+    <>
       {/* Logo block */}
-      <div className="h-14 flex items-center px-5 border-b border-line">
+      <div className="h-14 flex items-center px-5 border-b border-line shrink-0">
-        <Link to="/" className="font-display text-base tracking-wider text-navy hover:opacity-80 transition-opacity">
+        <Link
+          to="/"
+          className="font-display text-base tracking-wider text-navy hover:opacity-80 transition-opacity"
+          onClick={onNavigate}
+        >
           ORDINIS
         </Link>
       </div>
 
       {/* Nav sections */}
       <nav className="flex-1 overflow-y-auto py-3 px-2 flex flex-col gap-4">
-        {visibleSections.map((section, idx) => (
+        {sections.map((section, idx) => (
           <div key={idx} className="flex flex-col gap-0.5">
             {section.label && (
-              <div className="text-cap px-3 py-1 text-mute">
+              <div className="text-cap px-3 py-1 text-mute">{section.label}</div>
-                {section.label}
-              </div>
             )}
             {section.items.map((item) => (
-              <SidebarLink key={item.to} {...item} />
+              <SidebarLink key={item.to} {...item} onClick={onNavigate} />
             ))}
           </div>
         ))}
@@ -139,7 +163,7 @@ export function Sidebar() {
 
       {/* User block — sticky bottom */}
       {auth.isAuthenticated && auth.user?.profile && (
-        <div className="border-t border-line px-3 py-3 flex items-center gap-2">
+        <div className="border-t border-line px-3 py-3 flex items-center gap-2 shrink-0">
           <div className="size-8 rounded-full bg-accent text-on-accent inline-flex items-center justify-center text-cell font-semibold">
             {String(
               auth.user.profile.preferred_username ||
@@ -164,11 +188,90 @@ export function Sidebar() {
           </div>
         </div>
       )}
-    </aside>
+    </>
   )
 }
 
-function SidebarLink({ to, label, icon: Icon, badge }: NavItem) {
+/**
+ * MobileSidebar — Sheet с тем же содержимым что desktop Sidebar. Открывается
+ * через hamburger button в TopBar (<1024px), закрывается на: backdrop click,
+ * Escape, или клик на любой nav item (auto-close, привычная mobile UX).
+ *
+ * <p>Hooks logic дублируется (auth, dictsCount etc.) — нужно для filter
+ * auth-required sections. Можно вынести в useSidebarSections() hook
+ * следующим refactor.
+ */
+export function MobileSidebar({ open, onClose }: { open: boolean; onClose: () => void }) {
+  const { t } = useTranslation()
+  const auth = useAuth()
+  const canMutate = useCanMutate()
+  const dictsQuery = useDictionaries()
+  const myDrafts = useMyDrafts(0, 1)
+
+  const dictsCount = dictsQuery.data?.length ?? 0
+  const myDraftsCount = myDrafts.data?.totalElements ?? 0
+  const reviewsCount = 0
+
+  const sections: NavSection[] = [
+    {
+      items: [
+        { to: '/', label: t('nav.home'), icon: Home },
+        {
+          to: '/dictionaries',
+          label: t('nav.dictionaries'),
+          icon: Database,
+          badge: dictsCount > 0 ? dictsCount : undefined,
+        },
+        { to: '/search', label: t('nav.search'), icon: Search },
+        { to: '/graph', label: t('nav.graph'), icon: GitBranch },
+      ],
+    },
+    {
+      label: t('nav.section.workflow'),
+      items: [
+        {
+          to: '/my-drafts',
+          label: t('nav.myDrafts'),
+          icon: FileText,
+          badge: myDraftsCount > 0 ? myDraftsCount : undefined,
+          authRequired: true,
+        },
+        {
+          to: '/reviews',
+          label: t('nav.reviews'),
+          icon: ClipboardList,
+          badge: reviewsCount > 0 ? reviewsCount : undefined,
+          authRequired: true,
+        },
+      ],
+    },
+    {
+      label: t('nav.section.admin'),
+      items: [
+        { to: '/audit', label: t('nav.audit'), icon: ScrollText, authRequired: true },
+        { to: '/outbox', label: t('nav.outbox'), icon: Inbox, authRequired: true },
+        { to: '/webhooks', label: t('nav.webhooks'), icon: Webhook, authRequired: true },
+      ],
+    },
+  ]
+  const visibleSections = sections
+    .map((s) => ({ ...s, items: s.items.filter((i) => !i.authRequired || canMutate) }))
+    .filter((s) => s.items.length > 0)
+
+  return (
+    <Sheet open={open} onOpenChange={(v) => { if (!v) onClose() }}>
+      <SheetContent
+        side="left"
+        size="md"
+        className="!w-[260px] !max-w-[260px] !p-0 !gap-0 flex flex-col bg-surface"
+      >
+        <SidebarContent sections={visibleSections} auth={auth} onNavigate={onClose} />
+      </SheetContent>
+    </Sheet>
+  )
+}
+
+function SidebarLink({ to, label, icon: Icon, badge, onClick }: NavItem & { onClick?: () => void }) {
   const location = useLocation()
   const active =
     to === '/'
@@ -178,6 +281,7 @@ function SidebarLink({ to, label, icon: Icon, badge }: NavItem) {
   return (
     <Link
       to={to}
+      onClick={onClick}
       className={cn(
         // text-body = 13px workhorse per handoff (см. styles.css @utility).
         'group flex items-center gap-2.5 px-3 py-1.5 rounded-md text-body transition-colors',

ordinis-admin-ui/src/components/layout/TopBar.tsx

@@ -5,6 +5,7 @@ import { AuthBadge } from '@/auth/AuthBadge'
 import { ThemeSwitch } from '@/components/layout/ThemeSwitch'
 import { VersionBadge } from '@/components/version/VersionBadge'
 import { SearchInput } from '@/ui/components/search-input'
+import { Menu } from 'lucide-react'
 import { useEffect, useRef, useState } from 'react'
 
 /**
@@ -21,7 +22,7 @@ const LANG_OPTIONS = [
   { id: 'en-US', label: 'EN' },
 ]
 
-export function TopBar() {
+export function TopBar({ onMenuClick }: { onMenuClick?: () => void }) {
   const { t, i18n } = useTranslation()
   const navigate = useNavigate()
   const [searchValue, setSearchValue] = useState('')
@@ -59,6 +60,18 @@ export function TopBar() {
 
   return (
     <header className="h-14 shrink-0 border-b border-line bg-surface flex items-center px-4 sm:px-6 gap-3">
+      {/* Hamburger (lg:hidden) — toggle MobileSidebar */}
+      {onMenuClick && (
+        <button
+          type="button"
+          aria-label={t('nav.menu', { defaultValue: 'Меню' })}
+          onClick={onMenuClick}
+          className="lg:hidden -ml-1 p-1.5 rounded-sm text-ink-2 hover:text-ink hover:bg-surface-2 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring transition-colors"
+        >
+          <Menu size={20} strokeWidth={1.75} />
+        </button>
+      )}
+
       {/* Breadcrumb — left */}
       <nav className="flex items-center gap-1.5 text-body min-w-0">
         {breadcrumb.map((crumb, i) => {
@@ -105,7 +118,10 @@ export function TopBar() {
         >
           {t('nav.docs')}
         </a>
-        <VersionBadge />
+        {/* VersionBadge hide на narrow viewport — diagnostic info, не critical UX */}
+        <span className="hidden md:inline-flex">
+          <VersionBadge />
+        </span>
         <ThemeSwitch />
         <LanguageSwitch
           value={i18n.language}

ordinis-admin-ui/src/components/record/RecordDrawer.tsx

@@ -129,9 +129,9 @@ export function RecordDrawer({
             'fixed inset-y-0 right-0 z-50 h-full bg-surface shadow-2xl border-l border-line',
             'flex flex-col',
             'transition-[max-width] duration-200 ease-out',
-            // Mobile <= 880px: fullscreen per handoff.
+            // Mobile <880px: fullscreen per handoff (line 465).
             'w-full',
-            wide ? 'sm:max-w-[880px]' : 'sm:max-w-[520px]',
+            wide ? 'min-[880px]:max-w-[880px]' : 'min-[880px]:max-w-[520px]',
             'data-[state=open]:animate-in data-[state=closed]:animate-out',
             'data-[state=closed]:slide-out-to-right data-[state=open]:slide-in-from-right',
             'data-[state=closed]:duration-200 data-[state=open]:duration-300',

ordinis-admin-ui/src/routes/__root.tsx

@@ -1,33 +1,41 @@
 import { createRootRouteWithContext, Outlet } from '@tanstack/react-router'
 import type { QueryClient } from '@tanstack/react-query'
-import { Sidebar } from '@/components/layout/Sidebar'
+import { useState } from 'react'
+import { Sidebar, MobileSidebar } from '@/components/layout/Sidebar'
 import { TopBar } from '@/components/layout/TopBar'
 import { UpdateBanner } from '@/components/version/UpdateBanner'
 
 /**
- * Root layout (Stage 3.1 design handoff):
+ * Root layout (Stage 3.1 + 3.x mobile responsive):
  *
- *  ┌─ Sidebar 220px (lg:flex) ──┬─ main column (flex-1) ────────────┐
+ *  ≥1024px (lg+):
- *  │ logo                       │ UpdateBanner (when applicable)    │
+ *   ┌─ Sidebar 220px ──┬─ main column (flex-1) ────┐
- *  │ nav rail с counters        │ TopBar h=56 sticky                │
+ *   │ logo             │ TopBar (sticky)           │
- *  │ user profile               │ Outlet (route content)            │
+ *   │ nav rail         │ Outlet (route content)    │
- *  └────────────────────────────┴───────────────────────────────────┘
+ *   │ user profile     │                           │
+ *   └──────────────────┴───────────────────────────┘
  *
- * Responsive: на <1024px sidebar скрывается (hidden lg:flex). Main grid
+ *  <1024px:
- * растягивается на весь viewport. Mobile hamburger drawer — TODO Stage 3.x.
+ *   ┌─ main column (flex-1) ────────────────────────┐
+ *   │ TopBar [☰] (hamburger toggles MobileSidebar)  │
+ *   │ Outlet                                        │
+ *   └───────────────────────────────────────────────┘
+ *   MobileSidebar — overlay Sheet (slide-in left, 260px).
  */
 export const Route = createRootRouteWithContext<{ queryClient: QueryClient }>()({
   component: RootLayout,
 })
 
 function RootLayout() {
+  const [mobileNavOpen, setMobileNavOpen] = useState(false)
   return (
     <div className="h-screen flex flex-col bg-bg text-ink overflow-hidden">
       <UpdateBanner />
       <div className="flex-1 flex min-h-0">
         <Sidebar />
+        <MobileSidebar open={mobileNavOpen} onClose={() => setMobileNavOpen(false)} />
         <div className="flex-1 flex flex-col min-w-0">
-          <TopBar />
+          <TopBar onMenuClick={() => setMobileNavOpen(true)} />
           <main className="flex-1 overflow-y-auto px-4 sm:px-6 py-4 sm:py-6">
             <div className="max-w-7xl mx-auto w-full">
               <Outlet />

ordinis-admin-ui/src/ui/components/dialog.tsx

@@ -49,12 +49,15 @@ export const DialogOverlay = React.forwardRef<
   )
 })
 
+// Mobile <880px = fullscreen (per handoff line 465); ≥880px = centered с max-w.
+// Используем arbitrary `min-[880px]:` (Tailwind v4 inline breakpoint) для точной
+// границы — handoff specifically wants 880, не стандартный md (768) или lg (1024).
 const SIZE_CLASSES: Record<string, string> = {
-  sm: 'max-w-[440px]',
+  sm: 'min-[880px]:max-w-[440px]',
-  md: 'max-w-[560px]',
+  md: 'min-[880px]:max-w-[560px]',
-  lg: 'max-w-[720px]',
+  lg: 'min-[880px]:max-w-[720px]',
-  xl: 'max-w-[880px]',
+  xl: 'min-[880px]:max-w-[880px]',
-  full: 'max-w-full max-h-full sm:max-w-[920px]',
+  full: 'min-[880px]:max-w-[920px]',
 }
 
 export type DialogContentProps = React.ComponentPropsWithoutRef<typeof DialogPrimitive.Content> & {
@@ -72,7 +75,12 @@ export const DialogContent = React.forwardRef<
       <DialogPrimitive.Content
         ref={ref}
         className={cn(
-          'fixed left-1/2 top-1/2 z-50 grid w-full -translate-x-1/2 -translate-y-1/2 gap-4 border border-line bg-surface p-6 shadow-2xl duration-200 sm:rounded-lg',
+          'fixed z-50 grid gap-4 border border-line bg-surface p-6 shadow-2xl duration-200',
+          // Mobile <880px (per handoff): fullscreen 100vw × 100dvh, no corners,
+          // no centered transform. Editor body становится single-column natively.
+          'inset-0 w-full h-full',
+          // Desktop ≥880px: centered modal с rounded corners + max-w из SIZE_CLASSES.
+          'min-[880px]:left-1/2 min-[880px]:top-1/2 min-[880px]:inset-auto min-[880px]:h-auto min-[880px]:w-full min-[880px]:-translate-x-1/2 min-[880px]:-translate-y-1/2 min-[880px]:rounded-lg',
           'data-[state=open]:animate-in data-[state=closed]:animate-out',
           'data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0',
           'data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95',

ordinis-admin-ui/src/ui/components/language-switch.tsx

@@ -61,7 +61,10 @@ export function LanguageSwitch({
                 : 'text-mute hover:text-ink hover:bg-surface-2',
             )}
           >
-            {opt.short ?? v.toUpperCase()}
+            {/* Display priority: short → label (if compact like "RU"/"EN") →
+              * uppercase id. Label predominates когда caller передал human
+              * label типа "RU"/"EN" в options. */}
+            {opt.short ?? opt.label ?? v.toUpperCase()}
           </button>
         )
       })}

ordinis-admin-ui/src/ui/components/sheet.tsx

@@ -49,11 +49,13 @@ const sheetVariants = cva(
         left: 'inset-y-0 left-0 h-full border-r data-[state=closed]:slide-out-to-left data-[state=open]:slide-in-from-left',
         right: 'inset-y-0 right-0 h-full border-l data-[state=closed]:slide-out-to-right data-[state=open]:slide-in-from-right',
       },
+      // Per handoff (line 465): drawers fullscreen <880px, max-w на ≥880px.
+      // arbitrary breakpoint `min-[880px]:` гарантирует точную границу.
       size: {
-        sm: 'sm:max-w-sm w-full',
+        sm: 'min-[880px]:max-w-sm w-full',
-        md: 'sm:max-w-[520px] w-full',
+        md: 'min-[880px]:max-w-[520px] w-full',
-        lg: 'sm:max-w-[720px] w-full',
+        lg: 'min-[880px]:max-w-[720px] w-full',
-        xl: 'sm:max-w-[880px] w-full',
+        xl: 'min-[880px]:max-w-[880px] w-full',
       },
     },
     defaultVariants: { side: 'right', size: 'md' },