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/features/matching/matchCardAdapter.ts

@@ -111,5 +111,13 @@ export function buildMatchCardViewModel(
     taxCalculatorUrl,
     isReviewRequired: match.status === 'PENDING_REVIEW',
     isStaleData: false,
+    // Schattenmarkt signal fields
+    signalSourceType: signal?.source?.type,
+    signalSourceCredibility: signal?.source?.credibility,
+    signalProbability: signal?.probability,
+    signalMarketIndicator: signal?.marketIndicator,
+    signalType: signal?.signalType,
+    signalIsVerified: signal?.isVerified,
+    aiSignalSummary: signal?.aiSummary,
   }
 }