fix: resolve 5 confirmed bugs from code review

- MapView.jsx: extract addBoundaryLayer function, use getComputedStyle
  for accent color (MapLibre rejects CSS vars in paint properties)
- PlaceCard.jsx: gate fetchNearbyContacts on auth.authenticated
- PlaceDetail.jsx: gate fetchNearbyContacts on auth.authenticated
- api.js: replace invalid timeout option with AbortSignal.timeout()
- RadialMenu.jsx: remove user-select from SVG style (Firefox rejects)
- Panel.jsx: add Cancel button for pending directions state

src/components/PlaceDetail.jsx

@@ -551,7 +551,7 @@ export default function PlaceDetail() {
 
   // Fetch nearby contacts for proximity annotation
   useEffect(() => {
-    if (!hasFeature('has_contacts') || placeLat == null || placeLon == null) {
+    if (!hasFeature('has_contacts') || !auth.authenticated || placeLat == null || placeLon == null) {
       setNearbyLabel(null)
       return
     }