* Refine Profile tab VoiceOver order to prioritise user information
Previously, VoiceOver user would have to traverse through header image, “follows you”, and the profile image before getting to the display name of the user.
Now, this element is the first element after the navigation bar.
* Add accessibility label to Timeline Compose post button
Previously, this button was using the SF symbol fallback label.
Now, it has a localized equivalent in addition to two other options: “New”, and “Create”
* Change accessible representation of Timeline nav bar menu
Previously, this would present as a static text.
Now, it has the header trait. In addition, by changing the representation, VoiceOver will read it out as “Home, Pop-up button, Header”, indicating that it opens a menu.
* Add accessibilityHint to Timeline tab Accounts selector
* Add accessibilityLabel and hint to PendingStatusesObserver
Previously, this button would have a label equal to the count of unread posts. Now, it states “X new posts” with the hint “Scrolls the timeline”
* Remove `.button` trait from `Link`s on Account Settings screen
SwiftUI currently sets both the `.button` and `.link` traits on these elements, which is a failure for WCAG 2.1 4.12: Name, Role, Value: https://www.w3.org/WAI/WCAG21/Understanding/name-role-value.html
There is a radar for this issue: FB11507660
* Improve accessibility by making `AppAccountView`s a Button
Previously, the component elements of the `fullView` would be rendered as 3-4 individual views that would _all_ be interactive and perform the same action.
Now, as a Button, only one accessibility element is vended.
* Fix account label color
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Co-authored-by: Thomas Ricouard <ricouard77@gmail.com>
