If a user has ~7 schedules, it becomes almost impossible and inconvenient to view the list of courses for that schedule in the extension popup.

• Add a max height of ~225px to the schedule list drop down (this should allow for four schedules visible without scrolling), and start a scrollbar inside the dropdown if the user adds more schedules.

Current: (look at the footer when viewing this video)
https://github.com/user-attachments/assets/bd0c5102-bb14-4167-9b5a-680cd6a47649

Expected (imagine a scrollbar inside the dropdown as if there were more than four schedules):