feat: add unit overload, enrich unit cards in slots, and display cred…

[Duy-Nguyen1104]

Description

[For the credit points to be correctly implemented, this PR assume that the backend doubtfire-api to have fetched this PR: https://github.com/thoth-tech/doubtfire-api/pull/71 for credit_points attribute to be added to unit model]

This PR implements comprehensive credit points tracking, unit overload functionality, and displaying unit metadata (course name, credit points, level) in unit card.

• Regarding the credit points component, I have added color-coded progress bars with status indicators (early, moderate, on-track, complete) to help students track their degree completion.
• Add an overload option for students. A modal dialog will appear when students attempt to add overload units to a trimester, providing educational guidance about overload requirements.
• Updated unit-card.component.ts to include essential metadata display.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Verified overload dialog functionality with proper user flow
• Tested credit points display correctly upon adding / removing unit from slots

Testing Checklist:

• Tested in latest Chrome
• Tested in latest Edge

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• My changes generate no new warnings
• I have requested a review from @macite and @jakerenzella on the Pull Request

[giangnht19]

I have pulled and successfully tested on my local machine. Good work!

[Triet-coder]

Tested locally: all good. Keep pushing!