Full migration and transition to Rust; Remove python artifacts

crates/myfsio-server/templates/csrf_error.html

@@ -0,0 +1,14 @@
+{% extends "base.html" %}
+{% block content %}
+<div class="text-center py-5">
+  <p class="text-uppercase text-muted small mb-2">Security Check Failed</p>
+  <h1 class="display-6 mb-3">Session Expired or Invalid</h1>
+  <p class="text-muted mb-4">Your session may have expired or the form submission was invalid. Please refresh the page and try again.</p>
+  {% if reason %}
+  <p class="text-danger small">{{ reason }}</p>
+  {% endif %}
+  <div class="d-flex flex-wrap justify-content-center gap-3">
+    <a class="btn btn-primary" href="{{ url_for(endpoint="ui.buckets_overview") }}">Return to buckets</a>
+  </div>
+</div>
+{% endblock %}