[5.x] Fix: Include port in CSP for Live Preview #11498
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This fixes #11497 where Live Preview's Content Security Policy (CSP) does not include the port number in the frame-ancestors directive when determining allowed origins.
This issue affects configurations where the control panel is served on a custom port (e.g., http://127.0.0.1:8000/ or http://localhost:8080/). Since CSP treats http://127.0.0.1/ and http://127.0.0.1:8000/ as distinct origins, the live preview fails to load within an iframe.