fix(admin-ui): sidebar font sizes per handoff spec

- Section labels (WORKFLOW / АДМИНИСТРИРОВАНИЕ): text-2xs (12px) → 10.5px
  Tektur per handoff caption spec. "Администрирование" не вылазит за
  220px sidebar.
- Nav items: text-sm (14px) → text-[13px] handoff body workhorse size.
- Badge counters: text-2xs (12px) → text-[11px] (mono IDs spec).

Partial — full font audit pending (Stage 3.x font sweep). См. nsi-hot.md.

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

@@ -126,7 +126,7 @@ export function Sidebar() {
         {visibleSections.map((section, idx) => (
           <div key={idx} className="flex flex-col gap-0.5">
             {section.label && (
-              <div className="px-3 py-1 text-2xs font-display uppercase tracking-[0.10em] text-mute">
+              <div className="px-3 py-1 font-display uppercase tracking-[0.10em] text-mute text-[10.5px] leading-none">
                 {section.label}
               </div>
             )}
@@ -179,7 +179,9 @@ function SidebarLink({ to, label, icon: Icon, badge }: NavItem) {
     <Link
       to={to}
       className={cn(
-        'group flex items-center gap-2.5 px-3 py-1.5 rounded-md text-sm transition-colors',
+        // 13px per handoff spec для workhorse body text. text-sm = 14px (Tailwind),
+        // text-[13px] = exact handoff value.
+        'group flex items-center gap-2.5 px-3 py-1.5 rounded-md text-[13px] transition-colors',
         active
           ? 'bg-accent-bg text-accent font-medium'
           : 'text-ink-2 hover:text-ink hover:bg-surface-2',
@@ -190,7 +192,7 @@ function SidebarLink({ to, label, icon: Icon, badge }: NavItem) {
       {badge !== undefined && (
         <span
           className={cn(
-            'inline-flex items-center justify-center min-w-5 h-5 px-1.5 rounded-sm text-2xs font-mono',
+            'inline-flex items-center justify-center min-w-5 h-5 px-1.5 rounded-sm text-[11px] font-mono',
             active
               ? 'bg-accent text-on-accent'
               : 'bg-surface-2 text-ink-2 group-hover:bg-line',