ux(about): fold About card into the Admin Console

The About surface (version + license + source links + update check)
used to live as its own Settings section and the user-card dropdown
exposed it from both desktop and mobile. The three cards collectively
get opened once or twice a year, mostly by the operator confirming
the running version against the latest release.

Move the surface to `/admin/about` and drop the dropdown link from
both the desktop sidebar and the mobile top-bar. The public-facing
landing at `/about` (credits + MaxMind attribution) stays untouched
since it's reachable without a session. The legacy `/settings/about`
route still resolves so external bookmarks don't break, but is no
longer surfaced in any nav.

The existing `<AboutSection>` is reused as-is — no markup changes,
the component owns its own heading so the admin renderer mounts it
without the SectionFrame wrapper.

src/components/admin/admin-shell.tsx

@@ -21,6 +21,7 @@ import {
   Bell,
   Database,
   FileText,
+  Info,
   KeyRound,
   Inbox,
   Plug,
@@ -125,6 +126,12 @@ export const ADMIN_SECTIONS: readonly AdminSection[] = [
     titleKey: "admin.section.danger-zone.title",
     icon: ShieldAlert,
   },
+  // v1.4.36 W4e — About / version / update check folded into Admin.
+  {
+    slug: "about",
+    titleKey: "admin.section.about.title",
+    icon: Info,
+  },
 ] as const;
 
 export interface AdminShellProps {

src/components/admin/section-slugs.ts

@@ -29,6 +29,10 @@ export const ADMIN_SECTION_SLUGS = [
   "app-logs",
   "backups",
   "danger-zone",
+  // v1.4.36 W4e — About / version / update check folded into Admin
+  // Console. Lives at /admin/about; the legacy /settings/about route
+  // is unlinked from the user-card dropdown.
+  "about",
 ] as const;
 
 export type AdminSectionSlug = (typeof ADMIN_SECTION_SLUGS)[number];