feat: Reminder Manager + Schattenmarkt-Freigabe + mock data overhaul

- Add Reminder Manager page (/supply/reminder-manager) with KPI bar,
  filter bar, list/card feed, and detail drawer (7 sections incl.
  activity log, snooze, complete, dismiss actions)
- Add Schattenmarkt-Freigabe toggle on PropertyDetailView: Verwaltung
  can opt-in properties for early market exposure before contract expiry
- Auto-generate FutureSignal cards via useSchattenmarktSignals hook
  when leaseEndDate - leadTimeMonths <= MOCK_TODAY
- Fix useUnifiedResults: use property.resultType as fallback (was
  defaulting everything to VERIFIED_PORTFOLIO)
- Fix demand Results: hide VERIFIED_PORTFOLIO from non-manager users
  even when showOwnProperties toggle was previously enabled
- Fix AppShell: redirect to allowed workspace on user role switch
- Fix 3 wrong match scores (match-002: 93→62, match-009: 86→55,
  match-017: 87→52)
- Add 7 new match records (match-050–056) for need-001, need-002,
  need-011
- Add need-011 (Retail Bern Innenstadt)
- Add prop-031–036 (EXTERNAL_MARKET / MAISON_WORK / FUTURE_AVAILABILITY)
- Fix duplicate image URLs across all properties
- Add signal-011 (Bern Altstadt, Mode Boutique) + propertyId to
  signal-001

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

src/hooks/useSchattenmarktSignals.ts

@@ -0,0 +1,72 @@
+import { useMemo } from 'react'
+import type { Property } from '../domain/property'
+import type { FutureSignal } from '../domain/futureSignal'
+import { SignalType, RiskLevel, ResultType } from '../domain/enums'
+
+// Matches the mock date used throughout the prototype (currentDate context: 2026-05-20)
+const MOCK_TODAY = new Date('2026-05-20')
+
+export function useSchattenmarktSignals(properties: Property[]): FutureSignal[] {
+  return useMemo(() => {
+    const signals: FutureSignal[] = []
+    for (const p of properties) {
+      if (p.resultType !== ResultType.VERIFIED_PORTFOLIO) continue
+      const rel = p.schattenmarktRelease
+      if (!rel?.enabled) continue
+      const triggerDate = getEarliestTriggerDate(p, rel.leadTimeMonths)
+      if (!triggerDate || MOCK_TODAY < triggerDate) continue
+      signals.push(buildSignal(p))
+    }
+    return signals
+  }, [properties])
+}
+
+function getEarliestTriggerDate(p: Property, leadTimeMonths: number): Date | null {
+  const candidates: Date[] = []
+  if (p.leaseEndDate) {
+    const d = new Date(p.leaseEndDate)
+    d.setMonth(d.getMonth() - leadTimeMonths)
+    candidates.push(d)
+  }
+  if (p.breakoutOption && p.breakoutOptionDate) {
+    const d = new Date(p.breakoutOptionDate)
+    d.setMonth(d.getMonth() - leadTimeMonths)
+    candidates.push(d)
+  }
+  return candidates.length ? candidates.reduce((a, b) => (a < b ? a : b)) : null
+}
+
+function buildSignal(p: Property): FutureSignal {
+  const targetDate = p.breakoutOption && p.breakoutOptionDate
+    ? new Date(p.breakoutOptionDate)
+    : p.leaseEndDate ? new Date(p.leaseEndDate) : new Date()
+
+  const monthsUntil = Math.max(1, Math.round(
+    (targetDate.getTime() - MOCK_TODAY.getTime()) / (1000 * 60 * 60 * 24 * 30)
+  ))
+
+  const locationLabel = `${p.location.city}${p.location.district ? `, ${p.location.district}` : ''}`
+  const monthName = targetDate.toLocaleDateString('de-CH', { month: 'long', year: 'numeric' })
+
+  return {
+    id: `schattenmarkt-${p.id}`,
+    signalType: SignalType.LEASE_EXPIRY,
+    propertyId: p.id,
+    title: `${p.title} — frei ab ${monthName}`,
+    locationHint: locationLabel,
+    areaSqmEstimate: p.areaSqm,
+    probability: 0.92,
+    confidenceScore: 0.92,
+    timeHorizonMonths: monthsUntil,
+    source: { type: 'LEASE_CONTRACT', credibility: 'HIGH' },
+    sensitivityLevel: 'INTERNAL',
+    disclaimer: 'Verwaltung hat dieses Objekt für den Schattenmarkt freigegeben. Vertragsende aus internem ERP bestätigt — höchste Signalqualität.',
+    riskLevel: RiskLevel.LOW,
+    relevanceScore: 0.92,
+    isVerified: true,
+    organizationId: p.organizationId,
+    createdAt: MOCK_TODAY.toISOString(),
+    updatedAt: MOCK_TODAY.toISOString(),
+    aiSummary: `Vertrag der ${p.currentTenant ?? 'aktuellen Mietpartei'} läuft in ${monthsUntil} Monaten aus (${monthName}). Fläche: ${p.areaSqm.toLocaleString('de-CH')} m² · ${locationLabel}. Die Verwaltung hat dieses Objekt explizit für den Markt freigegeben — vertraglich bestätigt, keine Schätzung.`,
+  }
+}