feat: Schattenmarkt cards — source pills, probability bar, AI summary

Complete IntelligenceMatchCard redesign for FUTURE_AVAILABILITY signals:
purple gradient hero, source type pills, credibility indicators,
probability LinearProgress bar, market indicator badge, AI-generated
signal summary block. Added aiSummary field to FutureSignal domain
and rich German AI summaries to mock signals 001–005.

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

src/components/match-card/MatchCardViewModel.ts

@@ -49,6 +49,15 @@ export interface MatchCardViewModel {
   explainabilitySummary?: string
   taxCalculatorUrl?: string    // deeplink to cantonal tax calculator
 
+  // Schattenmarkt / FUTURE_AVAILABILITY signal fields
+  signalSourceType?: 'PRESS' | 'CONSTRUCTION_PERMIT' | 'JOB_POSTING' | 'COMPANY_REPORT' | 'MARKET_DATA' | 'MANUAL'
+  signalSourceCredibility?: 'LOW' | 'MEDIUM' | 'HIGH'
+  signalProbability?: number
+  signalMarketIndicator?: string
+  signalType?: string
+  signalIsVerified?: boolean
+  aiSignalSummary?: string
+
   // States
   isSelected?: boolean
   isCompareSelected?: boolean