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/components/layout/AppShell.tsx

@@ -38,6 +38,7 @@ import {
   MessageSquare,
   Menu,
   Kanban,
+  BellRing,
 } from 'lucide-react'
 import type { LucideIcon } from 'lucide-react'
 import { OrganizationContextBadge } from './OrganizationContextBadge'
@@ -82,6 +83,7 @@ const WORKSPACE_CONFIG: Record<WorkspaceType, WorkspaceConfig> = {
     navItems: [
       { path: '/supply/dashboard', label: 'Übersicht', icon: LayoutDashboard },
       { path: '/supply/properties', label: 'Meine Objekte', icon: Building2 },
+      { path: '/supply/reminder-manager', label: 'Reminder Manager', icon: BellRing },
       { path: '/supply/anfragen', label: 'Anfragencenter', icon: MessageSquare },
       { path: '/supply/data-quality', label: 'Datenpflege', icon: CheckSquare },
       { path: '/supply/market-intelligence', label: 'Markt Intelligence', icon: Radar },
@@ -525,6 +527,22 @@ export function AppShell() {
     }
   }, [location.pathname, activeWorkspace, setActiveWorkspace])
 
+  // When the user changes (role switch), redirect to their first allowed workspace
+  // if the current workspace is no longer permitted
+  useEffect(() => {
+    if (!currentUser) return
+    const allowed = currentUser.allowedWorkspaces
+    if (!allowed.includes(activeWorkspace)) {
+      const first = allowed[0]
+      if (first) {
+        setActiveWorkspace(first)
+        navigate(WORKSPACE_CONFIG[first].firstPath, { replace: true })
+      }
+    }
+  // currentUser object reference changes on every role switch — that's the correct trigger
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [currentUser])
+
   const handleWorkspaceClick = (workspace: WorkspaceType) => {
     setActiveWorkspace(workspace)
     navigate(WORKSPACE_CONFIG[workspace].firstPath)