feat: replace color dropdown with clickable links in catalog sidebar

- Updated `side-bar.html` to use clickable links instead of a dropdown for color selection
- Enhanced catalog view to generate URLs for color filters and "any color" option
- Simplified the user experience for color filtering and improved accessibility

templates/catalog/_fragments/side-bar.html

@@ -88,14 +88,12 @@
         {% if available_colors %}
         <section class="a-section color-section">
             <h2>Цвет</h2>
-            <select name="color" onchange="this.form.submit()">
-                <option value="">Любой</option>
-                {% for color in available_colors %}
-                    <option value="{{ color.id }}" {% if selected_color_id == color.id|stringformat:"i" %}selected{% endif %}>
-                        {{ color.name }}
-                    </option>
-                {% endfor %}
-            </select>
+            <a href="{{ any_color_url }}" class="category {% if not selected_color_id %}active{% endif %}">Любой</a>
+            {% for color in available_colors %}
+                <a href="{{ color.catalog_url }}" class="category {% if selected_color_id == color.id|stringformat:"i" %}active{% endif %}">
+                    {{ color.name }}
+                </a>
+            {% endfor %}
         </section>
         {% endif %}
     </form>