feat: show tenancy scope (Org → Chapter) in chapter & member portals

Surface where the logged-in user sits in the hierarchy via a ScopeCard
in the sidebar, below the brand mark.

API:
- Enrich chapter login/me responses with tenantName + organization
  (LoginResponse.admin, AdminProfile types updated)
- Add GET /my/scope returning member's chapter + organization

Web:
- ScopeCard component (Organisation row + Chapter row, themed icons)
- Chapter portal: scope from auth context, blue accent
- Member portal: scope fetched server-side in layout, emerald accent
- PortalShell gains a `scope` slot rendered under the brand

Org and admin portals intentionally omit it — org IS the scope, admin is
platform-wide.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/app/my/member-nav.tsx

@@ -4,12 +4,19 @@ import Link from 'next/link';
 import { usePathname } from 'next/navigation';
 import { cn } from '../_lib/utils';
 import { Button } from '../_components/ui/button';
+import { ScopeCard } from '../_components/scope-card';
 import { PORTAL_THEMES } from '../_components/portal-theme';
 import {
   LayoutDashboard, Newspaper, Calendar, HeartHandshake, Users2,
   BookOpen, Sparkles, Images, Contact, Settings, LogOut,
 } from 'lucide-react';
 
+interface MemberScope {
+  member: { displayName: string | null };
+  chapter: { id: string; slug: string; name: string };
+  organization: { id: string; slug: string; name: string } | null;
+}
+
 const NAV = [
   { href: '/my', label: 'Dashboard', icon: <LayoutDashboard /> },
   { href: '/my/digest', label: 'Digest', icon: <Newspaper /> },
@@ -24,7 +31,7 @@ const NAV = [
   { href: '/my/settings', label: 'Settings', icon: <Settings /> },
 ];
 
-export function MemberNav() {
+export function MemberNav({ scope }: { scope?: MemberScope | null }) {
   const pathname = usePathname();
   const t = PORTAL_THEMES.emerald;
 
@@ -45,6 +52,10 @@ export function MemberNav() {
         </div>
       </div>
 
+      {scope && (
+        <ScopeCard accent="text-emerald-600" organization={scope.organization} chapter={scope.chapter} />
+      )}
+
       <nav className="flex-1 overflow-y-auto p-3 space-y-1">
         {NAV.map((item) => {
           const isActive = item.href === '/my' ? pathname === '/my' : pathname.startsWith(item.href);