Bug: "insertBefore" NotFoundError when adding a new page

[crewletapp]

Bug Report

Description

The application crashes with a React DOM reconciliation error whenever a new page is added.

Error Message

NotFoundError: Cannot perform "insertBefore" on "Node": The node to be inserted is not a child of this node.
at ir (https://app.superdesign.dev/static/js/lib-react.ea884da0.js:2:94091)
at ir (https://app.superdesign.dev/static/js/lib-react.ea884da0.js:2:94202)
at ir (https://app.superdesign.dev/static/js/lib-react.ea884da0.js:2:94202)
at iS (https://app.superdesign.dev/static/js/lib-react.ea884da0.js:2:104085)
at iw (https://app.superdesign.dev/static/js/lib-react.ea884da0.js:2:98998)
at ib (https://app.superdesign.dev/static/js/lib-react.ea884da0.js:2:98868)
at iw (https://app.superdesign.dev/static/js/lib-react.ea884da0.js:2:101164)
at ib (https://app.superdesign.dev/static/js/lib-react.ea884da0.js:2:98868)
at iw (https://app.superdesign.dev/static/js/lib-react.ea884da0.js:2:98990)
at ib (https://app.superdesign.dev/static/js/lib-react.ea884da0.js:2:98868)

Steps to Reproduce

1. Open the application
2. Add a new page

Expected Behavior

New page is added without errors.

Actual Behavior

Application crashes with the above NotFoundError.

Root Cause (suspected)

This is a React DOM reconciliation conflict. Likely causes:

1. Unstable/missing key props on page list items — when the list re-renders after a new page is inserted, React miscalculates which DOM nodes to move/insert
2. Portal target unmounted — if a ReactDOM.createPortal is used in page components and its container gets removed from the DOM during re-render, this exact error fires
3. External DOM mutation (e.g. browser extension) interfering with React's virtual DOM

Suggested Fix

• Verify every item in the page list has a stable, unique key prop (not array index)
• Audit any ReactDOM.createPortal usage tied to page components
• Check for any third-party scripts modifying the DOM directly

Environment

• App: https://app.superdesign.dev
• Reported by user: eckzahn115209@gmail.com