corrected type mismatch

Web/templates/edit_library.html

@@ -271,7 +271,8 @@
                 <small style="display:block; color:#666; margin-top: 5px;">Der Basis-Code steht oben. Alle weiteren Gruppenmitglieder werden hier untereinander aufgeführt.</small>
             </div>
 
-            <!-- ================= SYSTEM FILTERS 1-3 (ALWAYS RENDERED) ================= -->
+            {% if not show_library_features %}
+            <!-- ================= SYSTEM FILTERS 1-3 (INVENTORY / OTHER ITEMS ONLY) ================= -->
             <div class="filter-inputs">
                 <h3>Unterrichtsfach (Filter 1):</h3>
                 <div class="multi-filter">
@@ -307,6 +308,7 @@
                     {% endfor %}
                 </div>
             </div>
+            {% endif %}
 
             <!-- ================= DATES & FINANCIALS ================= -->
             <div class="form-group">
@@ -488,9 +490,11 @@
     document.addEventListener('DOMContentLoaded', function() {
         loadLocationOptions();
 
-        // Always load Filter 1 and Filter 2 options for all items
-        loadAndSelectFilterValues(1);
-        loadAndSelectFilterValues(2);
+        // Load Filter options if elements exist on page
+        if (document.getElementById('filter1-1')) {
+            loadAndSelectFilterValues(1);
+            loadAndSelectFilterValues(2);
+        }
 
         const scanCodeBtn = document.getElementById('scan-code4-btn');
         if (scanCodeBtn) scanCodeBtn.addEventListener('click', startCode4Scanner);