Added Gantt Graph to Visualize Event Overlaps and Modified Event Collision Detection in Calendar_saver

[TairanJ]

This pull request includes significant changes to the access_amherst_backend project, focusing on improving event similarity detection, enhancing the dashboard, and adding new functionality for Gantt charts. The most important changes are grouped by theme below:

Event Similarity Detection:

• access_amherst_backend/access_amherst_algo/calendar_scraper/calendar_saver.py: Replaced the existing event similarity check using difflib.SequenceMatcher with a more robust approach using TF-IDF vectors and cosine similarity to compare event titles. [1] [2] [3]

Dashboard Enhancements:

• access_amherst_backend/access_amherst_algo/templates/access_amherst_algo/dashboard.html: Added new scripts and styles to improve the dashboard layout, including forcing a two-column grid, increasing the maximum width, and preventing card overflow. Also added a Gantt chart for visualizing overlapping events and adjusted the heatmap container styling. [1] [2] [3] [4] [5] [6]

New Gantt Chart Functionality:

• access_amherst_backend/access_amherst_algo/urls.py: Added a new URL pattern for updating the Gantt chart data.
• access_amherst_backend/access_amherst_algo/views.py: Implemented the update_gantt view to fetch events within a specified date and time range, returning the data in JSON format for the Gantt chart.

Debugging and Development:

• access_amherst_backend/access_amherst_backend/settings.py: Enabled debug mode and added 127.0.0.1 to the allowed hosts to facilitate local development.