feat: F021 market intelligence & signal discovery

Signal domain types, mock data (8 signals), provider interface + MockupMarketIntelligenceProvider, marketIntelligenceService, TanStack Query hooks, 10 ops components (SignalInbox, MarketSignalCard, MarketSignalFilterBar, MarketSignalSkeleton, MarketSignalEmptyState, SignalConfidenceBadge, SourceReliabilityBadge, SensitivityWarningPanel, SignalConversionPanel, SignalEvidenceList), MarketIntelligence page wired into AppShell nav and App router.

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

src/hooks/useMarketSignals.ts

@@ -0,0 +1,73 @@
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import { marketIntelligenceService } from '../services/marketIntelligenceService'
+import { reviewService } from '../services/reviewService'
+import type { MarketSignalFilters, SignalProcessingStatus } from '../domain/marketSignal'
+
+const STALE_SIGNALS = 30_000
+
+export function useMarketSignals(filters?: MarketSignalFilters) {
+  return useQuery({
+    queryKey: ['market-signals', filters ?? {}],
+    queryFn: () => marketIntelligenceService.getSignals(filters),
+    staleTime: STALE_SIGNALS,
+    select: (res) => res.data ?? [],
+  })
+}
+
+export function useMarketSignalDetail(id: string | null) {
+  return useQuery({
+    queryKey: ['market-signal', id],
+    queryFn: () => marketIntelligenceService.getSignalDetail(id!),
+    enabled: id !== null,
+    staleTime: STALE_SIGNALS,
+    select: (res) => res.data ?? null,
+  })
+}
+
+export function useUpdateSignalStatus() {
+  const queryClient = useQueryClient()
+  return useMutation({
+    mutationFn: ({ id, status }: { id: string; status: SignalProcessingStatus }) =>
+      marketIntelligenceService.updateSignalStatus(id, status),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['market-signals'] })
+      queryClient.invalidateQueries({ queryKey: ['market-signal'] })
+    },
+  })
+}
+
+export function useConvertToFutureSignal() {
+  const queryClient = useQueryClient()
+  return useMutation({
+    mutationFn: (id: string) => marketIntelligenceService.convertToFutureSignal(id),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['market-signals'] })
+      queryClient.invalidateQueries({ queryKey: ['market-signal'] })
+    },
+  })
+}
+
+export function useLinkSignalToEntity() {
+  const queryClient = useQueryClient()
+  return useMutation({
+    mutationFn: ({
+      id,
+      entityType,
+      entityId,
+    }: {
+      id: string
+      entityType: 'property' | 'need'
+      entityId: string
+    }) => marketIntelligenceService.linkSignalToEntity(id, entityType, entityId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['market-signals'] })
+      queryClient.invalidateQueries({ queryKey: ['market-signal'] })
+    },
+  })
+}
+
+export function useCreateReviewTask() {
+  return useMutation({
+    mutationFn: (signalId: string) => reviewService.createReviewTask(signalId),
+  })
+}