Staff tabs and article editing

What changed

Staff tabs group round controls, users, news articles and round reset.

Staff-made articles appear below the editor; Edit loads an article and Save changes updates its existing entry.

Portal assets use versioned URLs to avoid stale publishing controls.

Article storage initializes safely when its migration has not run yet.

Covert results have their own blue news category and icon.

Quick actions merges tax and both scan-sharing controls into one box; all start unchecked after round reset.