Add CORS headers to webpack.config.js

[samholmes]

This is to support core v2.41.0 and greater.

CHANGELOG

Does this branch warrant an entry to the CHANGELOG?

• Yes
• No

Dependencies

none

Description

none

---

Note

Low Risk
Dev-server-only configuration change; low impact outside local development, with main risk being overly permissive local CORS behavior.

Overview
Adds explicit CORS and cross-origin isolation headers to the webpack-dev-server config (Access-Control-*, Cross-Origin-*) to allow local development usage from other origins and enable SharedArrayBuffer/worker scenarios.

Updates the CHANGELOG.md Unreleased section to document the local-dev header change.

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