Fix JavaScript CSRF token error in data analyzer

- Add missing {% csrf_token %} to data analyzer template
- Resolves "Cannot read properties of null (reading 'value')" error
- JavaScript now properly accesses CSRF token for form submission

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

data_analyzer/templates/data_analyzer/detail.html

@@ -314,6 +314,7 @@
 {% block content %}
 <div class="data-analyzer-page">
     <div class="container">
+        {% csrf_token %}
         <!-- Main Content Grid -->
         <div class="main-grid">
             <!-- Input Form -->