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When an embedded visualization URL references a slug that no longer exists, return a user-friendly HTML page (200) instead of Django default 404. This displays cleanly inside iframes and avoids cross-origin error handling issues. Cache headers prevent the response from being cached so the real visualization appears once re-created. Co-Authored-By: Claude Opus 4.6
Co-Authored-By: Claude Opus 4.6
The view now correctly returns 404 with friendly HTML content. Update the test to match. Co-Authored-By: Claude Opus 4.6
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Copy of #600 with a local branch to allow Heroku CI to run