* Add sidebar icons and menus (Help, Account)
* Place the account dropdown menu above the tooltip
* Hide tooltip when dropdown menu is shown
* Fixup tooltip position
* Add Digital Science link
* Add aria-labels on the dropdown toggles
* Update sidebar items spacings
- Add space between notification and DS icons
- Balance margin/padding in the scrollable part
* Revert changing the side of .dev-tool-bar-open-button
* Remove `!important` in link color
* Add Help tooltip
* Revert dropdown-menu z-index change
* Move `AccountMenuItems` to its own file
* Revert "Remove `!important` in link color"
This reverts commit b2de83f815d05cd1e224604d4ca355986ba76b99.
GitOrigin-RevId: 286266ea5348384f2592f748d3ae32c452558988
