One helper for the appsFirst order; the tell page's header matches what it draws #958

Follow-ups to #929 from product-reviewer-2's verdict.

• One helper for the order. The appsFirst ORDER BY was copied into all three repository listings (listReposVisibleTo, listReposWritableTo, listReposByOwner); I had replaced every match where I meant one. It is now one newestFirst(options) helper. Behaviour is the same: newest first, or apps first and then newest.
• The tell page's header matches what it draws. Dependencies stay in view, and who has it and its labels sit in the closed Details section. The old header said the dependency form did not belong on the page, but the page draws dependenciesCard.

Removed: nothing. tsc is clean; studio, web-ui, palette, web and the cross files pass (334).

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