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refactor(empty-state): make children optional with no actions

Address Copilot review on #2127. The action-less branch of
`EmptyStateProps` required `children`, which forced every search
empty state on the Skills page to pass a meaningless `<></>` to
satisfy the type. Relax the union to `children?: ReactNode` and drop
the placeholder fragments from all six skills components.

Rendered DOM is unchanged (the empty fragment never produced a node),
so no test updates are needed.