fix: MarketLeads zeigt 0 Leads — Provider liest live aus Mock-Daten

MockupFutureSignalProvider kopierte mockFutureSignals einmalig in einen
store-Array beim Modulload. Vite HMR und React Query Cache (staleTime 5min)
führten dazu, dass signalDirection-Feld in gecachten Resultaten fehlte.

Lösung: Provider liest jetzt immer direkt aus dem lebenden mockFutureSignals-
Import via resolve()-Helper. Mutationen (verify, updateStatus) werden in einer
Map gespeichert und beim Lesen überlagert. Damit sind HMR-Änderungen an
Mock-Daten sofort sichtbar ohne Browser-Neustart.

Ausserdem: irreführenden CircularProgress aus Empty-State entfernt.

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

src/pages/supply/MarketLeads.tsx

@@ -1,7 +1,6 @@
 import {
   Box,
   Chip,
-  CircularProgress,
   Divider,
   Paper,
   Skeleton,
@@ -283,8 +282,8 @@ export default function MarketLeads() {
           </>
         ) : leads.length === 0 ? (
           <Paper sx={{ p: 4, textAlign: 'center' }}>
-            <CircularProgress size={24} sx={{ mb: 2, color: '#94a3b8' }} />
-            <Typography variant="body1" color="text.secondary">Keine aktiven Markt-Leads gefunden.</Typography>
+            <Target size={32} color="#94a3b8" style={{ marginBottom: 12 }} />
+            <Typography variant="body1" color="text.secondary" sx={{ mb: 0.5 }}>Keine aktiven Markt-Leads gefunden.</Typography>
             <Typography variant="caption" color="text.disabled">Signale werden laufend aus öffentlichen Quellen erkannt.</Typography>
           </Paper>
         ) : (

src/provider/MockupFutureSignalProvider.ts

@@ -3,11 +3,21 @@ import type { FutureSignal } from '../domain/futureSignal'
 import type { ReviewStatus } from '../domain/enums'
 import { mockFutureSignals } from '../mock-data/futureSignals'
 
-const store: FutureSignal[] = [...mockFutureSignals]
+// Mutation overrides — applied on top of the live mockFutureSignals import.
+// Reading directly from mockFutureSignals (not a copied store) ensures that
+// Vite HMR changes to the mock data are always reflected immediately.
+const mutationOverrides = new Map<string, Partial<FutureSignal>>()
+
+function resolve(): FutureSignal[] {
+  return mockFutureSignals.map(s => {
+    const override = mutationOverrides.get(s.id)
+    return override ? { ...s, ...override } : s
+  })
+}
 
 export const MockupFutureSignalProvider: IFutureSignalProvider = {
   async getAll(filters?: FutureSignalFilters) {
-    let results = [...store]
+    let results = resolve()
     if (filters?.signalType) results = results.filter(s => s.signalType === filters.signalType)
     if (filters?.minProbability !== undefined) results = results.filter(s => s.probability >= filters.minProbability!)
     if (filters?.organizationId) results = results.filter(s => s.organizationId === filters.organizationId)
@@ -18,19 +28,19 @@ export const MockupFutureSignalProvider: IFutureSignalProvider = {
     return results.sort((a, b) => b.probability - a.probability)
   },
   async getById(id) {
-    return store.find(s => s.id === id) ?? null
+    return resolve().find(s => s.id === id) ?? null
   },
   async getByProperty(propertyId) {
-    return store.filter(s => s.propertyId === propertyId)
+    return resolve().filter(s => s.propertyId === propertyId)
   },
   async verify(id, verifiedBy) {
-    const idx = store.findIndex(s => s.id === id)
-    store[idx] = { ...store[idx], isVerified: true, verifiedBy, verifiedAt: new Date().toISOString(), updatedAt: new Date().toISOString() }
-    return store[idx]
+    const existing = mutationOverrides.get(id) ?? {}
+    mutationOverrides.set(id, { ...existing, isVerified: true, verifiedBy, verifiedAt: new Date().toISOString(), updatedAt: new Date().toISOString() })
+    return resolve().find(s => s.id === id)!
   },
   async updateReviewStatus(id, status: ReviewStatus) {
-    const idx = store.findIndex(s => s.id === id)
-    store[idx] = { ...store[idx], reviewStatus: status, updatedAt: new Date().toISOString() }
-    return store[idx]
+    const existing = mutationOverrides.get(id) ?? {}
+    mutationOverrides.set(id, { ...existing, reviewStatus: status, updatedAt: new Date().toISOString() })
+    return resolve().find(s => s.id === id)!
   },
 }