Remove SideRail Drawer

[wmontwe]

The Dropdown drawer is enabled on release, once it's released and nothing major is reported, we should remove the SideRail drawer.

Status: waiting for release feedback

Tasks:

• Remove side rail drawer feature (not used anymore since v11)
• Remove side rail compat ui within dropdown drawer (wait for release feedback!)

[krzysdz]

Are there any plans to make navigation easier? Some people prefer the SideRail Drawer, because it is (was) way faster than the new dropdown drawer, which requires more clicks and waiting for animations - see #9568.

[CaffeineOnIce]

Here's the feedback. It's genuinely an accessibility nightmare. I have 5 mails. I gotta tap like 3 or 4 times just to check something between different accounts. It's genuinely the worst change in this app, till date.