Phase 1: Workflows UI, Dedup/Merge UI, Import/Export UI, Print/PDF

- Workflows UI: full page with definitions/instances tabs, step editor, instance detail with approve/reject
- Dedup/Merge UI: duplicate detection, side-by-side comparison, field-level merge dialog, merge history
- Import/Export UI: import wizard (dry-run preview), export panel (CSV/XLSX), backend export route added
- Print/PDF: PrintButton component, print.css, integrated in Contacts/Calendar/Reports/ContactDetail
- Backend: GET /api/v1/export endpoint, export_companies_csv() service function
- Routes: /workflows, /contacts/dedup, /import-export registered
- Menu items: Workflows, Import/Export, Duplikate added to automation plugin manifest
- IMPLEMENTATION_PLAN.md: audit-corrected plan for all 14 remaining features

frontend/src/pages/ContactDetailPage.tsx

@@ -11,6 +11,7 @@ import { useWindowStore } from '@/store/windowStore';
 import { useUnifiedContact, type UnifiedContact } from '@/api/hooks';
 import { Button } from '@/components/ui/Button';
 import { ChevronLeft } from 'lucide-react';
+import { PrintButton } from '@/components/common/PrintButton';
 
 export function ContactDetailPage() {
   const { t } = useTranslation();
@@ -49,8 +50,10 @@ export function ContactDetailPage() {
           <ChevronLeft className="w-4 h-4" aria-hidden="true" strokeWidth={2} />
           <span>{t('contacts.title')}</span>
         </button>
+        <div className="flex-1" />
+        <PrintButton targetId="contact-detail" />
       </div>
-      <div className="flex-1 overflow-y-auto">
+      <div className="flex-1 overflow-y-auto" id="contact-detail">
         <ContactDetail
           contact={contact ?? null}
           loading={isLoading}