Reorganize settings page navigation and contents

Results of the design review for settings (05.08.2025) with the design team.

Navigation

• Create separation under admin settings
  • Core
  • Apps
  • everything else
• Add search in navigation (or search everywhere in settings?)
• Navigation resets scroll on navigating, should retain scroll position

Personal settings

• Personal info ( https://github.com/nextcloud/server/pull/61358 )
  • Language, locale, and day of the week doesn't fit w the rest, move somewhere else
  • Organize everything into sections and have a single column instead of a multicolumn layout
• Security ( https://github.com/nextcloud/server/issues/63454 )
  • Adjust and limit width
  • Move devices and sessions to mobile and desktop?
  • App password is difficult to reach, move somewhere else @nickvergessen thoughts for this and the previous point, as we are moving things out of the security section?
  • Make it easier to log in with qr code ref https://github.com/nextcloud/server/issues/44603 -
• Notifications
  • reduce width between mail and push columns
• External storage
  • move below in the navigation
• Mobile and desktop
  • move below security section
  • update the android banner
  • rename to something more general --> Apps and clients?

Admin settings

• Artificial intelligence
  • Rename to Assistant and use assistant icon @DaphneMuller what are your thoughts?
  • organize everything to one line each: task name [toggle] [dropdown]
  • move context chat here
• Admin privileges page should be moved somewhere else
• Context chat
  • table looks very technical, update with better design
  • move to AI section
• combine Activity and Notifications into one section
• AppAPI
  • Improve subline to be more informative
  • Left align everything

cc @jancborchardt @kra-mo @marcoambrosini