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/page/CatalogPage.vue

@@ -69,7 +69,7 @@
       v-if="showPanel"
       class="absolute top-20 left-4 bottom-4 z-10 w-96 max-w-[calc(100vw-2rem)] hidden lg:block"
     >
-      <div class="bg-base-300/95 backdrop-blur rounded-xl shadow-lg p-4 h-full overflow-hidden flex flex-col">
+      <div class="bg-base-300/95 backdrop-blur rounded-xl shadow-lg p-4 h-full overflow-y-auto">
         <slot name="panel" />
       </div>
     </div>