Convert workflow builder to module

[ViolanteCodes]

Converts workflow builder to module, fixes escaping all at once (so copilot doesn't tag each module as it goes in), and adds first battery of tests for workflow builder

[Copilot]

Pull request overview

This PR converts the workflow-builder.js static asset from a classic-script global to an ES module export, updates the Django admin template to import it as a module, and adds regression tests to ensure key workflow-builder UI strings are properly HTML-escaped to prevent XSS.

Changes:

• Export WorkflowBuilder as an ES module and remove the window.WorkflowBuilder global assignment.
• Update workflow_builder.html to import { WorkflowBuilder } from the static asset via a <script type="module">.
• Add Vitest + JSDOM tests covering module import wiring and escaping regressions in getNodeDescription() and buildFormProperties().

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests_js/workflow-builder/moduleAndEscaping.test.js	Adds module-wiring and XSS-escaping regression tests for key builder-rendered HTML.
django_forms_workflows/templates/admin/django_forms_workflows/workflow_builder.html	Switches admin initialization to a module script that imports WorkflowBuilder instead of relying on a global.
django_forms_workflows/static/django_forms_workflows/js/workflow-builder.js	Exports WorkflowBuilder as an ES module and escapes additional interpolated fields in rendered HTML.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.