Minor fixes for the 2-panel design

--public

• Fixed layout issues for large screens
• Minor design change in the schedule
• The saved courses selector now has a badge to indicate the amount of saved courses
• Help popover on course cards now does not block interactions with the rest of the page

--end_public

Addresses #194 (closed), #195 (closed), #196 (closed), #197 (closed), and #198 (closed)