Add bindings refactor prototype pages

[bogdandoaga]

Motivation

• Provide a static UI prototype to demonstrate how a folder rename/delete event surfaces a modal to refactor bindings.
• Surface an explicit breaking-change banner and explain that the refactor runs as a system user using the required copy strings.
• Make the flow discoverable from a simple prototype index for quick review.

Description

• Add prototype/index.html which links to the bindings refactor prototype.
• Add prototype/bindings-refactor.html which implements the breaking-change banner with the copy Breaking change detected: folder path update and Refactor under system user to update all impacted bindings.
• Implement a modal dialog (role="dialog" aria-modal="true") showing impacted bindings as a checklist with all checkboxes checked by default and actions for Review later and Run refactor.
• Include self-contained styling via inline CSS so the pages are static and portable.

Testing

• Served the prototype directory with python -m http.server and verified the pages were reachable at http://127.0.0.1:8000/.
• Ran a Playwright script to load http://127.0.0.1:8000/bindings-refactor.html and capture a screenshot saved as artifacts/bindings-refactor.png, which completed successfully.

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Codex Task