feat: Objekt→Einheit architecture — unit-level pre-market, property detail page, click-through from cards

- Domain: PropertyUnit extended with propertyId + schattenmarktRelease per unit
- Domain: FutureAvailabilityResult carries resolved property + unit
- useSchattenmarktSignals: generates unit-level signals (schattenmarkt-{propId}-{unitId})
- useUnifiedResults: resolves backing property + unit on FUTURE_AVAILABILITY fast path
- IUnitProvider + MockupUnitProvider: first-class unit access and mutation
- matchCardAdapter: maps preMarketUnit, preMarketAllUnits, propertyId, unitId to ViewModel
- IntelligenceMatchCard: PRE-MARKET VERIFIED shows unit info strip + "Zur Einheit →" button
- PropertyDetailView: unit-level toggles + date pickers inside PreMarketPanel
- New page: /demand/property/:propertyId with unit table, status chips, inquiry form
- App.tsx: demand route /demand/property/:propertyId registered
- Mock data: prop-001/007/037 units updated with correct lease dates + unit-level schattenmarktRelease

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

src/features/matching/matchCardAdapter.ts

@@ -36,10 +36,11 @@ export function buildMatchCardViewModel(
   const isFuture = resultType === 'FUTURE_AVAILABILITY'
   const property = !isFuture
     ? (result as VerifiedPortfolioResult | ExternalMarketResult).property
-    : undefined
+    : (result as FutureAvailabilityResult).property
   const signal = isFuture
     ? (result as FutureAvailabilityResult).signal
     : undefined
+  const unit = isFuture ? (result as FutureAvailabilityResult).unit : undefined
 
   const city = property?.location?.city
   const district = property?.location?.district
@@ -47,6 +48,9 @@ export function buildMatchCardViewModel(
     ? `${city}${district ? `, ${district}` : ''}`
     : signal?.locationHint ?? '–'
 
+  // For PRE-MARKET: title comes from unit if available, then signal, then property
+
+
   const availabilityLabel =
     property?.availabilityDate ??
     (signal?.timeHorizonMonths ? `~${signal.timeHorizonMonths} Monate` : undefined)
@@ -69,8 +73,8 @@ export function buildMatchCardViewModel(
   return {
     id: result.matchId,
     title:
-      property?.title ??
       signal?.title ??
+      property?.title ??
       signal?.companyName ??
       signal?.locationHint ??
       '–',
@@ -116,5 +120,9 @@ export function buildMatchCardViewModel(
     signalConfirmedFacts: signal?.confirmedFacts,
     signalUnconfirmedFacts: signal?.unconfirmedFacts,
     signalAreaSqmEstimate: signal?.areaSqmEstimate,
+    propertyId: property?.id ?? signal?.propertyId,
+    unitId: unit?.id ?? signal?.unitId,
+    preMarketUnit: unit,
+    preMarketAllUnits: property?.units,
   }
 }