fix(ui): delete prompts use data-confirm, so a quote in a name no longer runs script (#5099)

#5099 "A name containing a quote runs script when an admin clicks Delete".
Inline handlers like onclick="return confirm('Delete {{ rule.name }}?')" are
HTML-decoded before the JavaScript is parsed, so autoescaping did not stop a
name such as  x');fetch(…);//  from running.

- Every prompt (22 handlers, plus the docker prune and token revoke ones)
  is now data-confirm="…", read through dataset by one submit listener in
  base.html; nothing rendered is parsed as JavaScript.
- The remaining inline handlers take integers only (|int), and the time
  range buttons pass this.dataset.range.
- tests/test_inline_handlers.py fails on any {{ }} in an inline handler that
  is not |int, with a self-test; tests/_templates.py is the one template
  walker the template guards now share.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

steward/templates/ansible/browse.html

@@ -28,7 +28,7 @@
             {% if view_editable and session.user_role == 'admin' %}
             <a href="/ansible/playbooks/edit/{{ view_source }}/{{ view_path }}" class="btn btn-sm">Edit</a>
             <form method="post" action="/ansible/playbooks/delete" style="display:inline;"
-                  onsubmit="return confirm('Delete {{ view_path }}?');">{{ csrf_field() }}
+                  data-confirm="Delete {{ view_path }}?">{{ csrf_field() }}
                 <input type="hidden" name="source_name" value="{{ view_source }}">
                 <input type="hidden" name="playbook_path" value="{{ view_path }}">
                 <button type="submit" class="btn btn-sm btn-danger">Delete</button>