Label each schedule variation

[zac-k-03]

As a student, I want the system to label each schedule variation (e.g., "Shortest Time on Campus," "Earliest Finish," "Balanced") so that I can quickly understand my choices.

• Labeling Mechanism:
	○ Implement a labeling system that assigns descriptive tags to each generated timetable based on key metrics:
		- "Shortest Time on Campus": Minimal total on-campus time.
		- "Earliest Finish": The last class of the day ends the earliest.
		- "Balanced": A balanced spread of classes with moderate gaps.
	○ Ensure that the labels are computed based on quantitative criteria (e.g., sum of gap durations, start and end times).
• UI Integration:
	○ Display the labels prominently alongside each timetable variation.
	○ Ensure that labels update dynamically if the user changes constraints or regenerates the schedules.
• Testing & Validation:
	○ Unit tests to verify that each label is assigned correctly based on the corresponding criteria.
	○ Validate that multiple schedules are properly differentiated by their labels.
	○ Confirm that the labeling logic does not conflict with the core scheduling algorithm.
• User Feedback:
	○ Optionally include an info icon next to the label that explains what the label means in terms of schedule metrics.
	○ Gather user feedback to refine label definitions if necessary.