feat: Refactor rides app with unique constraints, mixins, and enhanced documentation

- Added migration to convert unique_together constraints to UniqueConstraint for RideModel.
- Introduced RideFormMixin for handling entity suggestions in ride forms.
- Created comprehensive code standards documentation outlining formatting, docstring requirements, complexity guidelines, and testing requirements.
- Established error handling guidelines with a structured exception hierarchy and best practices for API and view error handling.
- Documented view pattern guidelines, emphasizing the use of CBVs, FBVs, and ViewSets with examples.
- Implemented a benchmarking script for query performance analysis and optimization.
- Developed security documentation detailing measures, configurations, and a security checklist.
- Compiled a database optimization guide covering indexing strategies, query optimization patterns, and computed fields.

templates/components/ui/card.html

@@ -1,3 +1,6 @@
+{% load safe_html %}
+{# Security: Header, content, and footer are sanitized to prevent XSS. #}
+
 <div class="border rounded-lg shadow-sm bg-card text-card-foreground">
     {% if header or title %}
     <div class="flex flex-col space-y-1.5 p-6">
@@ -8,19 +11,19 @@
         <p class="text-sm text-muted-foreground">{{ description }}</p>
         {% endif %}
         {% if header %}
-        {{ header|safe }}
+        {{ header|sanitize }}
         {% endif %}
     </div>
     {% endif %}
-    
+
     <div class="p-6 pt-0">
-        {{ content|safe }}
+        {{ content|sanitize }}
         {% block card_content %}{% endblock %}
     </div>
-    
+
     {% if footer %}
     <div class="flex items-center p-6 pt-0">
-        {{ footer|safe }}
+        {{ footer|sanitize }}
     </div>
     {% endif %}
 </div>