Layout moves too much when typing in the search bar

[nicolo-ribaudo]

Describe the bug

Screencast.From.2026-03-16.23-08-27.mp4

When typing, the contents of the page keep jumping up and down. It seems to be caused by adding&removing that "claim package" button.

While checking if the new package name is available or not the button/header should probably stay there, rather than being optimistically removed to then be re-added as soon as the relative fetch ends.

Additional context

No response

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