Release 0.5.2

### Added - An API key or a plugin's secret has a Show button at the end of its field, so you can check what you typed before saving. ### Changed - Screen readers read a setting's description and any problem found with it along with its field, and a field the server found a problem with rings red. - When a plugin's settings can't be read, the message beside Reset is in red, as the other errors in a card are. - The Tags section in the sidebar unfolds and folds as a reply's sources and steps do, rather than jumping open and shut. - The sidebar's chats sit under a Chats heading that folds them away, as the Tags heading does. Both headings are bolder and darker, and the dates under Chats lighter and closer together, so the dates read as a step below them. - The composer's model and thinking effort choices moved out of the card into a quiet line under it, leaving only Attach and Send beside the box. A long model name is cut short there rather than pushing the effort onto a second line, and hovering it shows the whole name. - For admins, Settings and Admin are now tabs at the top of the settings and admin sidebars, in place of the title, rather than a single link at the bottom of the list.