Haystack/Infinite canvas mode

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Check for existing issues

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Describe the feature

I'd love Zed to have an infinite canvas editing mode where I can visually sequence control flow through movable text buffers.
This mode is an example of what's possible with GUI vs TUI and is a game changer when debugging a messy spaghetti code.

You can think of it like a mindmap-assisted code comprehension.

Source of inspiration https://haystackeditor.com/

If applicable, add mockups / screenshots to help present your vision of the feature

No response