Webpack was printing several warnings about missing default exports,
particularly from components, where we auto-generate a default import via the
component index.
As part of this, the emoji picker recent handling (which is not a component) is
moved elsewhere to avoid the generated import.
We use a trick with refs to automatically focus the element, also making use of mx_HiddenFocusable to hide the unnecessary outline.
The menu itself has been restructured to hide some elements from screen readers (reduce noise) and to have a single unordered list. Screen readers mention when the user "enters" a list, and each item was previously saying "enter list <action>" when it should have just been "<action>".
By focusing automatically, the keyboard can be used to go up/down the menu as may be expected by keyboard users.
Tjis is quite confusing as the welcome page is designed for when
you're not logged in, ie. has a sign-in button. There's also no way
to get back into the app so it really looks like it's logged you
out.
Reverts 116367fd69
