This commit adds the profile tab to the experimental user menu. We're adding it to the user menu because it contains links/buttons that are not available anywhere else. We may remove the tab again if we find better places for those links/buttons, but for now it'll stay.
For more context on the experimental user menu, see https://github.com/discourse/discourse/pull/17379.
Some of the changes in this PR are extracted from https://github.com/discourse/discourse/pull/17379.
Similar to the bookmarks tab in the new user menu, the messages tab also displays a mix of notifications and messages. When there are unread message notifications, the tab displays all of these notifications at the top and fills the remaining space in the menu with a list of the user's messages. The bubble/badge count on the messages tab indicates how many unread message notifications there are.
Some of the changes in this commit are extracted from https://github.com/discourse/discourse/pull/17379.
The bookmarks tab in the new user menu is different from the other tabs in that it can display a mixture of notifications and bookmarks. When there are unread bookmark reminder notifications, the tab displays all of these notifications at the top and fills the remaining space in the menu with the rest of the bookmarks. The bubble/badge count on the bookmarks tab indicates how many unread bookmark reminder notifications there are.
On the technical aspect, since this commit introduces a new `bookmark-item` component, we've done some refactoring so that all 3 "item" components (`notification-item`, `reviewable-item` and the new `bookmark-item`) inherit from a base component and get identical HTML structure so they all look consistent.
Internal tickets: t70584 and t65045.
Osama Sayegh