The update includes modifications in the lectures' order by start_time in course model. The lecture duration is now correctly calculated by minutes instead of hours. Additionally, in the lecture view, an online indicator is added for each lecture and popover is implemented to show the lecture start and end times..
A new method has been added to the `CoursesController` which allows admins to fill default live video URLs for online lectures that don't have one. This feature is accessible via a button on the courses admin page. The routing for this new action has also been set up.
This commit refines event summary parsing in the course model. Instead of splitting the summary, it uses regular expressions to extract the unit code and short lecture title more accurately. The update also includes better handling of events that don't match this format.
- Made TrackedTimeEntries polymorphic to belong to both Lecture and WorkItems models
- Added associated migrations for existing data
- Added to administrate UI
