Add CORS headers to webpack.config.js

[Jon-edge]

CHANGELOG

Does this branch warrant an entry to the CHANGELOG?

• Yes
• No

Dependencies

none

Description

none

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Note

Low Risk
Dev-only webpack configuration change; primary risk is impacting local development behavior, not production runtime.

Overview
Adds explicit CORS and cross-origin isolation response headers to the webpack-dev-server configuration to support local development (including SharedArrayBuffer/web-worker use cases).

Updates CHANGELOG.md under Unreleased to document the dev-server header change.

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