This is a clean, well-targeted fix. The change correctly disables visual editing controls when the server is disconnected by checking previewServerState.type === 'connected' in addition to the environment variable.

The TimelineExpandedSection component makes API calls (/api/subscribe-to-sequence-props, /api/save-sequence-props) that would fail when disconnected, so hiding these controls prevents a confusing UX where buttons appear but don't work.

One minor observation: TimelineTracks.tsx also checks EXPERIMENTAL_VISUAL_MODE_ENABLED for rendering expanded track placeholders but doesn't include the server connection check. If a track is expanded when the server disconnects, TimelineTracks will still reserve placeholder space while TimelineListItem won't render the actual expanded content. This is a very minor edge case and not blocking—the PR as-is solves the main problem effectively.

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