Issues sidebar on mobile
The issue sidebar takes up significant horizontal space on mobile, and causes a lot of text wrapping and other graphical issues.
My recommended solution would probably be to add a button/banner element (either below the issue title/author or below the issue itself, above the emoji bar) that says "More information" with a dropdown icon. By default the sidebar would be collapsed, but when pressed this would open vertically to display the information in the issue sidebar.
/cc @creamzy