[WIP] Fix main thread blocking when retrieving SSH keys

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>mici ui: don't block main thread on getting SSH keys</issue_title>
<issue_description></issue_description>

<agent_instructions>mici ui specifically</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes mici ui: don't block main thread on getting SSH keys #37294

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[sshane]

@copilot try again