Error fixing and debugging implementation.

Web/app.py

@@ -3826,11 +3826,14 @@ def api_item_detail(item_id):
         {f'<p><strong>Ausgeliehen von:</strong> {html.escape(str(borrower_value))}</p>' if borrower_value and status_label == 'Ausgeliehen' else ''}
         {borrows_html}
         """
+        ctx = get_tenant_context()
+        current_tenant_id = ctx.tenant_id if ctx else None
 
         client.close()
         return jsonify({
             'html': detail_html,
-            'images': item.get('Images', item.get('Bilder', []))
+            'images': item.get('Images', item.get('Bilder', [])),
+            'tenant': str(current_tenant_id)
         }), 200
     except Exception as e:
         app.logger.error(f"Error fetching item detail: {e}")

Web/templates/library_table.html

@@ -1381,9 +1381,14 @@
                             : `/uploads/${image}`;
 
                         return `
-                        <div class="item-image-wrapper">
-                            <img src="${imageSrc}" alt="Buchcover / Bild" class="item-image" loading="lazy">
-                        </div>
+                                <div class="item-image-wrapper">
+                                    <img src="${imageSrc}"
+                                        alt="Buchcover"
+                                        class="item-image"
+                                        loading="lazy"
+                                        onload="console.log('Bild geladen:', '${imageSrc}')"
+                                        onerror="console.error('FEHLER beim Laden des Bildes im DOM:', '${imageSrc}')">
+                                </div>
                     `;
                     }).join('');