feat: Expanded Calendar View

- The main idea is that we want to transform the current interface into a termly calendar view ((similar to the Google Calendar and myunsw)
- Users will have the ability to switch between day, week and monthly agenda views
- In future, we plan for this to be used in social timetabling whereby a user may create custom events for future dates (and for the new homepage interface)

Start by reviewing the existing calendar interface and the repository's TypeScript/React structure; the issue does not identify specific files, tests, or entry points. Define the termly calendar requirements for day, week, and monthly agenda views, while treating social timetabling and the new homepage interface as future work.

Written by the indexing model from the issue text.