Ability for admin group to view and modify all boards (even other users)

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Is your feature request related to a problem? Please describe.
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As someone in the admin group, I am not able to access / view other users boards or modify them.

Describe the solution you'd like
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The ability to enable the option to view all boards even if I do not own them and they're not shared with me

Describe alternatives you've considered
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Preventing anyone else from making boards.

Additional context
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N/A

The issue names no files, tests, or entry points. Start by tracing how Deck enforces board ownership and sharing for admin-group users, then define the permission and UI behavior before identifying the relevant tests; done means admins can view and modify unshared boards without changing ordinary users' access.