Closes #40608


Release Notes:

- settings_ui: Fixed an issue where tabbing to the nav bar from the
search bar while the nav bar was scrolled would result in the first
_visible_ nav entry being selected, instead of the literal first nav
entry
- settings_ui: Fixed an issue where scrolling the selected nav entry off
screen would cause the keyboard shortcut hint for the focus nav / focus
content binding to dissapear
- settings_ui: Fixed an issue where text input controls could not be
focused via the keyboard