fix: course title not set when creating a reminder + unique key for timetable

[JothishKamal]

Pull Request Type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Purpose

• WHAT is this PR for?
• Fixes course title not being set when creating a reminder
• Fatal Exception: java.lang.IllegalArgumentException
  Key "0Timestamp(seconds=1754904600, nanoseconds=0)_BCSE334L_F2_Timestamp(seconds=1754907600, nanoseconds=0)" was already used. If you are using LazyColumn/Row please make sure you provide a unique key for each item.

Approach

• HOW does this change fulfill the purpose?
• Fixes the bug by setting course ID and title when adding a reminder in AcademicsScreenContent
• Fixes the bug by generating a random UUID for each period

Does this PR introduce any new bug?

• Yes
• No
• Maybe

Issue Reference: #63

[dk-a-dev]

yep this should work