UI fixes: header height, map color, panel scroll

- MainNavigation: fixed min-height to prevent jumping on mode switch
- CatalogMap: default pointColor changed from green to orange (#f97316)
- CatalogPage: panel scroll on entire container, not inner
- SelectionPanel: sticky header and search, removed inner scroll

app/components/catalog/CatalogMap.vue

@@ -51,7 +51,7 @@ const props = withDefaults(defineProps<{
   initialCenter?: [number, number]
   initialZoom?: number
 }>(), {
-  pointColor: '#10b981',
+  pointColor: '#f97316',
   initialCenter: () => [37.64, 55.76],
   initialZoom: 2,
   useServerClustering: false,