feat(inquiries): top-level Inquiries page (list + detail + convert), nav entries; retire admin inbox

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/components/layout/mobile/more-sheet.tsx

@@ -6,6 +6,7 @@ import {
   Bookmark,
   Building2,
   FileSignature,
+  MailQuestion,
   FileText,
   Globe,
   Home,
@@ -53,6 +54,7 @@ const MORE_GROUPS: MoreGroup[] = [
     items: [
       { label: 'Documents', icon: FileSignature, segment: 'documents' },
       { label: 'Interests', icon: Bookmark, segment: 'interests' },
+      { label: 'Inquiries', icon: MailQuestion, segment: 'inquiries' },
       { label: 'Yachts', icon: Ship, segment: 'yachts' },
       { label: 'Companies', icon: Building2, segment: 'companies' },
       { label: 'Residential', icon: Home, segment: 'residential/clients' },