Release 0.7.4

### Changed - A settings or admin page for a role, plugin, model, or key that isn't there says so in a dashed card with the section's icon, "Role not found" or the like, and why it may be gone, in place of a bare line under the missing name. - The way back above a settings or admin page, such as ← Roles, is a row tinted when hovered, as the sidebar's Back to chats is.