feat: F006 supply dashboard — complete spec implementation

- dataQualityService with getPortfolioQualitySummary()
- Service methods: getDashboardPropertiesSummary, getStrongMatches,
  getSignalSummary, getDashboardTasks added to respective services
- dashboardService uses Promise.allSettled for partial error resilience
- KpiCard: onClick + Tooltip support
- KpiGrid: navigate actions and tooltips per card
- StrongMatchMiniCard: Match Center, Prüfung, Vergleichen action buttons
- FutureSignalWidget: time horizon distribution (0–6, 6–12, 12–24 Mo.)
- SupplyDashboard: DashboardHeader, empty state, error state,
  partial widget errors, permission-based rendering per UserRole

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

src/services/propertyService.ts

@@ -5,6 +5,7 @@ import type { ListResponse, ItemResponse } from './types'
 import type { Property } from '../domain/property'
 
 const provider = MockupPropertyProvider
+const ACTIVE_STATUSES: readonly string[] = ['AVAILABLE_NOW', 'AVAILABLE_SOON']
 
 export const propertyService = {
   async getAll(filters?: PropertyFilters): Promise<ListResponse<Property>> {
@@ -27,4 +28,12 @@ export const propertyService = {
     await provider.remove(id)
     return { data: undefined }
   },
+
+  async getDashboardPropertiesSummary(): Promise<{ total: number; active: number }> {
+    const data = await provider.getAll()
+    return {
+      total: data.length,
+      active: data.filter(p => ACTIVE_STATUSES.includes(p.availabilityStatus)).length,
+    }
+  },
 }