Remove picnic sites from camping POI category

Picnic sites (a table in a park) are not useful for route planning
alongside actual camp sites and caravan sites. Removed from the
camping query to reduce noise.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/planner/app/lib/poi-categories.ts

@@ -28,7 +28,7 @@ export const poiCategories: PoiCategory[] = [
     name: "poi.camping",
     icon: "⛺",
     color: "#059669",
-    query: 'nwr["tourism"="camp_site"];nwr["tourism"="caravan_site"];nwr["tourism"="picnic_site"];',
+    query: 'nwr["tourism"="camp_site"];nwr["tourism"="caravan_site"];',
   },
   {
     id: "food",