refactor(inventory): redesign inventory home layout with compact cards

- Replace large operation cards with smaller, uniform inventory-card components
- Update icon sizes and text styles for better visual hierarchy
- Group operations into a cleaner 4x3 grid layout using Bootstrap columns
- Simplify card hover effects with subtler shadows and background gradients
- Remove unused purple utility classes and old card-body styles
- Add focus outline support for accessibility on inventory cards

fix(customers): show total debt only when applicable and add external links

- Display total debt row only if debt is greater than zero in customer detail
- Remove redundant conditional inside debt display cell
- Add target="_blank" and rel attributes to order detail links to open in new tab

myproject/customers/templates/customers/customer_detail.html

@@ -138,17 +138,15 @@
                                 <span class="badge bg-info">{{ last_year_orders_sum|floatformat:2 }} руб.</span>
                             </td>
                         </tr>
+                        {% if total_debt > 0 %}
                         <tr>
                             <td class="text-muted"><i class="bi bi-exclamation-triangle-fill text-danger"></i> Общий долг:</td>
                             <td colspan="2">
-                                {% if total_debt > 0 %}
-                                    <span class="badge bg-danger">{{ total_debt|floatformat:2 }} руб.</span>
-                                    <small class="text-muted ms-2">(Заказов: {{ active_orders_count }})</small>
-                                {% else %}
-                                    <span class="badge bg-success">0.00 руб.</span>
-                                {% endif %}
+                                <span class="badge bg-danger">{{ total_debt|floatformat:2 }} руб.</span>
+                                <small class="text-muted ms-2">(Заказов: {{ active_orders_count }})</small>
                             </td>
                         </tr>
+                        {% endif %}
                         
                         <!-- Разделитель -->
                         <tr>
@@ -305,7 +303,7 @@
                                             {% endif %}
                                         </td>
                                         <td class="text-end">
-                                            <a href="{% url 'orders:order-detail' order.order_number %}" class="btn btn-sm btn-outline-primary">
+                                            <a href="{% url 'orders:order-detail' order.order_number %}" class="btn btn-sm btn-outline-primary" target="_blank" rel="noopener noreferrer" title="Открыть в новой вкладке">
                                                 <i class="bi bi-eye"></i>
                                             </a>
                                         </td>