[Feature] Schedules Explorer Timetable

[btwj]

Description

This is a pretty big feature, but it involves major changes to the schedule explorer.

• Based on the courses in the schedule, we should render a weekly timetable similar to SIO's one.
• For this feature, we need to build an interface to select sections for courses.
• This feature also requires a rather complex weekly timetable component.

Designs

No response