feat(renderer): interactive map with Leaflet + OpenStreetMap (M10.3)

- MapRenderer.vue: lazy-loads Leaflet, renders OSM tiles
- Orange marker pins for all places with coordinates
- Place list sidebar on desktop, popup on click
- "View on map" button in chat messages with places
- Integrated into content panel via openMapView()

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

packages/app/src/composables/useContentPanel.ts

@@ -52,6 +52,7 @@ const availableTabs = ref<ContentTab[]>([])
 const selectedDesignSystemItem = ref<DesignSystemItem | null>(null)
 const longFormArticle = ref<{ content: string; title?: string } | null>(null)
 const pdfUrl = ref<{ url: string; title?: string } | null>(null)
+const mapPlaces = ref<Place[]>([])
 
 export interface DesignSystemItem {
   id: string
@@ -275,6 +276,7 @@ export function useContentPanel() {
     selectedDesignSystemItem.value = null
     longFormArticle.value = null
     pdfUrl.value = null
+    mapPlaces.value = []
   }
 
   function openFilmDetail(film: Film) { clearAllSelections(); selectedFilm.value = film }
@@ -301,6 +303,9 @@ export function useContentPanel() {
   function openPdfViewer(url: string, title?: string) { clearAllSelections(); pdfUrl.value = { url, title }; panelOpen.value = true }
   function closePdfViewer() { pdfUrl.value = null }
 
+  function openMapView(places: Place[]) { clearAllSelections(); mapPlaces.value = places; panelOpen.value = true }
+  function closeMapView() { mapPlaces.value = [] }
+
   function openMagazineSectionDetail(section: MagazineSection, index: number) {
     clearAllSelections()
     selectedMagazineSection.value = section
@@ -451,6 +456,9 @@ export function useContentPanel() {
     pdfUrl,
     openPdfViewer,
     closePdfViewer,
+    mapPlaces,
+    openMapView,
+    closeMapView,
     enterDesignSystemMode,
     closePanel,
     showAllFilms,