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/dataQualityService.ts

@@ -0,0 +1,34 @@
+import { MockupPropertyProvider } from '../provider/MockupPropertyProvider'
+import type { DataQualitySummary } from '../domain/dashboard'
+
+export const dataQualityService = {
+  async getPortfolioQualitySummary(): Promise<DataQualitySummary> {
+    const properties = await MockupPropertyProvider.getAll()
+
+    const avgScoreRaw =
+      properties.length > 0
+        ? properties.reduce((sum, p) => sum + (p.dataQuality?.score ?? 0), 0) / properties.length
+        : 0
+
+    const fieldCounts = properties
+      .flatMap(p => p.dataQuality?.missingCriticalFields ?? [])
+      .reduce<Record<string, number>>((acc, f) => {
+        acc[f] = (acc[f] ?? 0) + 1
+        return acc
+      }, {})
+
+    const topMissingFields = Object.entries(fieldCounts)
+      .sort((a, b) => b[1] - a[1])
+      .slice(0, 5)
+      .map(([f]) => f)
+
+    return {
+      avgScore: Math.round(avgScoreRaw * 100),
+      critical: properties.filter(p => (p.dataQuality?.score ?? 0) < 0.5).length,
+      propertiesWithMissingCritical: properties.filter(
+        p => (p.dataQuality?.missingCriticalFields?.length ?? 0) > 0,
+      ).length,
+      topMissingFields,
+    }
+  },
+}