feat: embedded interactive map in property + match detail views

Integrates react-leaflet with OpenStreetMap tiles. PropertyDetailView
and MatchDetail now show property photo + zoomable/pannable map above
the tabs/content — always visible on card click, no redirect. Map
renders at correct lat/lng with a location marker and popup.

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

src/components/shared/PropertyMap.tsx

@@ -0,0 +1,60 @@
+import { useEffect } from 'react'
+import { Box } from '@mui/material'
+import { MapContainer, TileLayer, Marker, Popup, useMap } from 'react-leaflet'
+import L from 'leaflet'
+import 'leaflet/dist/leaflet.css'
+
+// Fix default marker icons in Vite build
+delete (L.Icon.Default.prototype as unknown as Record<string, unknown>)._getIconUrl
+L.Icon.Default.mergeOptions({
+  iconRetinaUrl: new URL('leaflet/dist/images/marker-icon-2x.png', import.meta.url).href,
+  iconUrl:       new URL('leaflet/dist/images/marker-icon.png',   import.meta.url).href,
+  shadowUrl:     new URL('leaflet/dist/images/marker-shadow.png', import.meta.url).href,
+})
+
+interface Props {
+  lat: number
+  lng: number
+  label?: string
+  height?: number
+}
+
+function RecenterOnChange({ lat, lng }: { lat: number; lng: number }) {
+  const map = useMap()
+  useEffect(() => {
+    map.setView([lat, lng])
+  }, [lat, lng, map])
+  return null
+}
+
+export function PropertyMap({ lat, lng, label, height = 260 }: Props) {
+  return (
+    <Box
+      sx={{
+        height,
+        width: '100%',
+        overflow: 'hidden',
+        flexShrink: 0,
+        // Ensure leaflet controls appear above MUI elements
+        '& .leaflet-container': { height: '100%', width: '100%', zIndex: 0 },
+        '& .leaflet-control': { zIndex: 1 },
+      }}
+    >
+      <MapContainer
+        center={[lat, lng]}
+        zoom={14}
+        scrollWheelZoom
+        style={{ height: '100%', width: '100%' }}
+      >
+        <RecenterOnChange lat={lat} lng={lng} />
+        <TileLayer
+          attribution='&copy; <a href="https://www.openstreetmap.org/copyright" target="_blank">OpenStreetMap</a>'
+          url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
+        />
+        <Marker position={[lat, lng]}>
+          {label && <Popup>{label}</Popup>}
+        </Marker>
+      </MapContainer>
+    </Box>
+  )
+}

src/components/shared/index.ts

@@ -1,4 +1,5 @@
 export { ViewToggle } from './ViewToggle'
 export { LocationPreview } from './LocationPreview'
+export { PropertyMap } from './PropertyMap'
 export { getScoreTier, SCORE_THEME } from './scoreTheme'
 export type { ScoreTier } from './scoreTheme'

src/components/supply/PropertyDetailView.tsx

@@ -13,6 +13,7 @@ import {
 import { X } from 'lucide-react'
 import { NegotiationInsightsPanel } from './NegotiationInsightsPanel'
 import { DataQualityPanel as DQPanel, ProvenancePanel } from '../data-quality'
+import { LocationPreview, PropertyMap } from '../shared'
 import type { Property } from '../../domain/property'
 import type { Match } from '../../domain/match'
 import type { FutureSignal } from '../../domain/futureSignal'
@@ -364,6 +365,28 @@ export function PropertyDetailView({ propertyId, onClose }: PropertyDetailViewPr
         )}
       </Box>
 
+      {/* Photo + Map */}
+      <Box sx={{ flexShrink: 0 }}>
+        {property.images?.[0] && (
+          <LocationPreview
+            imageUrl={property.images[0]}
+            lat={property.location.coordinates?.lat}
+            lng={property.location.coordinates?.lng}
+            address={`${property.address.street} ${property.address.houseNumber}, ${property.address.city}`}
+            cityLabel={property.location.city}
+            height={180}
+          />
+        )}
+        {property.location.coordinates && (
+          <PropertyMap
+            lat={property.location.coordinates.lat}
+            lng={property.location.coordinates.lng}
+            label={property.title}
+            height={240}
+          />
+        )}
+      </Box>
+
       {/* Tabs */}
       <Tabs
         value={tab}

src/pages/demand/MatchDetail.tsx

@@ -9,6 +9,7 @@ import { useCompareStore } from '../../stores/compareStore'
 import { useShortlistStore } from '../../stores/shortlistStore'
 import { AddToShortlistDialog } from '../../components/shortlist'
 import { MatchReasonList } from '../../components/match-card/MatchReasonList'
+import { LocationPreview, PropertyMap } from '../../components/shared'
 import {
   LocationIntelligencePanel,
   MatchDetailHeader,
@@ -142,6 +143,30 @@ export default function MatchDetail() {
         onShortlist={handleShortlist}
       />
 
+      {/* Photo + Map */}
+      {!isFuture && property && (
+        <Box sx={{ mb: 2, borderRadius: 2, overflow: 'hidden', border: '1px solid #e2e8f0' }}>
+          {property.images?.[0] && (
+            <LocationPreview
+              imageUrl={property.images[0]}
+              lat={property.location.coordinates?.lat}
+              lng={property.location.coordinates?.lng}
+              address={`${property.address.street} ${property.address.houseNumber}, ${property.address.city}`}
+              cityLabel={property.location.city}
+              height={200}
+            />
+          )}
+          {property.location.coordinates && (
+            <PropertyMap
+              lat={property.location.coordinates.lat}
+              lng={property.location.coordinates.lng}
+              label={property.title}
+              height={280}
+            />
+          )}
+        </Box>
+      )}
+
       <Box sx={{ display: 'flex', gap: 3, alignItems: 'flex-start' }}>
         {/* Main column */}
         <Box sx={{ flex: 1, minWidth: 0 }}>