Release 0.7.2

### Changed - For forks: `shared/ui/TimeAgo.tsx` has a new `TimeAgo`, how long ago something happened with the full time on hover, which the admin's users, API keys, and cron runs now share. - Code in settings and admin, such as model IDs, packages, and role names, now has one size everywhere: a step smaller than the text around it, as in a reply, but never under the caption size. Some of it was as large as the text around it. For forks: `shared/ui/Code.tsx` has a new `Code`. - For forks: `shared/ui/ExternalLink.tsx` has a new `ExternalLink`, a link that opens outside the app in a new tab, which reply links, sources, tool results, and Report an issue now share. - The × buttons that remove, clear, or close something now look alike: removing a role from a user's row turns grey on hover rather than red, and the composer's Clear is the muted grey rather than a fainter one. For forks: `shared/ui/CloseButton.tsx` has a new `CloseButton`, and `removeChip` is gone. - For forks: component sizes now follow one scale, as Mantine's do. `Button`'s `small` and `default` are `sm` and `md`, `IconButton`'s `small`, `default`, `toggle`, and `row` are `sm`, `md`, `lg`, and `xl`, with a new `xs`, and `Alert`'s `small` is `sm`. `IconButton` takes a `radius` of `sm`, `md`, or `full`.