Fix: type filter for Properties (property→properties mapping)

Replace naive singular+s pluralization with explicit type-to-filter
lookup map for correct handling of property→properties, class→classes,
individual→individuals, and ontology→ontologies.

Author: styk-tv

docs/public/browse/ontology-manager.js

@@ -766,11 +766,9 @@ class OntologyManager {
                 const type = entityItem.querySelector('.entity-type').textContent;
 
                 const matchesSearch = !query || label.includes(query) || uri.includes(query);
-                const typeLower = type.toLowerCase();
+                const typeToFilter = { 'class': 'classes', 'property': 'properties', 'individual': 'individuals', 'ontology': 'ontologies' };
                 const matchesFilter = this.currentFilter === 'all' ||
-                    typeLower === this.currentFilter ||
-                    typeLower + 's' === this.currentFilter ||
-                    typeLower + 'es' === this.currentFilter;
+                    (typeToFilter[type.toLowerCase()] || type.toLowerCase()) === this.currentFilter;
 
                 const isVisible = matchesSearch && matchesFilter;
                 entityItem.style.display = isVisible ? 'flex' : 'none';