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/futureSignalService.ts

@@ -1,6 +1,7 @@
 import { MockupFutureSignalProvider } from '../provider/MockupFutureSignalProvider'
 import type { FutureSignalFilters } from '../provider/IFutureSignalProvider'
 import type { FutureSignal } from '../domain/futureSignal'
+import type { FutureSignalSummary } from '../domain/dashboard'
 import type { ListResponse, ItemResponse } from './types'
 
 const provider = MockupFutureSignalProvider
@@ -22,4 +23,24 @@ export const futureSignalService = {
     const data = await provider.verify(id, verifiedBy)
     return { data }
   },
+
+  async getSignalSummary(): Promise<FutureSignalSummary> {
+    const signals = await provider.getAll()
+    const RESTRICTED: readonly string[] = ['CONFIDENTIAL', 'INTERNAL']
+    return {
+      total: signals.length,
+      highConfidence: signals.filter(s => s.confidenceScore >= 0.75).length,
+      restricted: signals.filter(s => RESTRICTED.includes(s.sensitivityLevel)).length,
+      needsReview: signals.filter(s => !s.isVerified).length,
+      avgTimeHorizonMonths:
+        signals.length > 0
+          ? Math.round(signals.reduce((sum, s) => sum + (s.timeHorizonMonths ?? 0), 0) / signals.length)
+          : 0,
+      timeHorizonDistribution: {
+        short: signals.filter(s => (s.timeHorizonMonths ?? 0) <= 6).length,
+        medium: signals.filter(s => { const m = s.timeHorizonMonths ?? 0; return m > 6 && m <= 12 }).length,
+        long: signals.filter(s => (s.timeHorizonMonths ?? 0) > 12).length,
+      },
+    }
+  },
 }