feat: Anfragencenter Parts A–E — read/unread, prep wizard, offer flow, report preview

- Part A: Replace InquiryStatus badges with WhatsApp-style unread indicators
  (isRead, unreadCount, lastReadAt on Inquiry; markThreadAsRead in service + hook)
- Part B: RelatedPropertyCardPanel — reposition "Objekt ansehen", add "Weitere
  Matches" section via matchService.getAdditionalMatchesForInquiry
- Part C: PreparationWizard 4-step dialog — property selection, report generation
  progress, field editing + ReportObjectFieldSelector, PDF preview + finalize
- Part D: OfferCreationWizard 4-step dialog triggered from first tenant message —
  data capture, field editing, viewing appointments, PDF generation + attach to reply
- Part E: LatentInquiryReportPreview (2-page A4 doc), ReportObjectFieldSelector
  (5 accordion groups, 35+ optional fields), mapImageUrl on Property domain

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

src/services/inquiryService.ts

@@ -1,6 +1,6 @@
 import { MockupInquiryProvider } from '../provider/MockupInquiryProvider'
 import type { InquiryFilters } from '../provider/IInquiryProvider'
-import type { Inquiry, InquiryStatus, Attachment } from '../domain/inquiry'
+import type { Inquiry, Attachment } from '../domain/inquiry'
 
 const provider = MockupInquiryProvider
 
@@ -49,12 +49,18 @@ export const inquiryService = {
     }
   },
 
-  async updateInquiryStatus(
-    id: string,
-    status: InquiryStatus,
-  ): Promise<ServiceResult<Inquiry>> {
+  async markThreadAsRead(id: string): Promise<ServiceResult<Inquiry>> {
     try {
-      const data = await provider.updateStatus(id, status)
+      const data = await provider.markThreadAsRead(id)
+      return { data, error: null }
+    } catch (e) {
+      return { data: null, error: e instanceof Error ? e.message : 'Unbekannter Fehler' }
+    }
+  },
+
+  async getUnreadCount(): Promise<ServiceResult<number>> {
+    try {
+      const data = await provider.getUnreadCount()
       return { data, error: null }
     } catch (e) {
       return { data: null, error: e instanceof Error ? e.message : 'Unbekannter Fehler' }