feat: Future Availability Intelligence — rebrand & card redesign

Replaces "Schattenmarkt" branding with professional Future Availability
Intelligence throughout the UI. Two distinct card types: Pre-Market
(LEASE_EXPIRY + verified, green accent) and Market Signal (probabilistic,
blue accent). Professioneller Data-Header replaces dark purple gradient.
New detail panel sections: Erkannte Marktindikatoren, Strategische
Interpretation, Bestätigt/Nicht bestätigt. All 15 mock signals enriched
with concrete Swiss CRE market indicators and strategic interpretations.
Signal quality shown as 4-dot indicator (Hoch/Mittel/Niedrig).

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

src/domain/futureSignal.ts

@@ -43,4 +43,10 @@ export interface FutureSignal {
   matchabilityScore?: number           // 0–100: how well this signal can be matched to needs
   reviewStatus?: ReviewStatus
   aiSummary?: string                   // AI-generated explanation of what this signal means
+
+  // Strategic intelligence fields
+  marketIndicators?: string[]          // ["Mitarbeiterzahl rückläufig -15%", ...]
+  strategicInterpretation?: string     // "Die Signale deuten auf ..."
+  confirmedFacts?: string[]            // ["Region bestätigt", ...]
+  unconfirmedFacts?: string[]          // ["Exakte Fläche unbekannt", ...]
 }