To-Do List

[amah853]

This pull request introduces a new "To-Do List" feature alongside improvements to the schedule display and some minor CSS fixes. The main user interface now displays both the schedule and the to-do list side-by-side, with the to-do list allowing users to add, view, and complete tasks (optionally associated with specific class periods). Additionally, some CSS comment syntax issues were corrected.

New To-Do List feature:

• Added a new TodoList component (src/ui/TodoList.js) that allows users to add, group, and remove to-do items, with optional association to schedule periods. Tasks are persisted using the existing cookieManager and are removed when marked complete.
• Integrated the TodoList into the main UI by updating Index.js to display both the schedule and the to-do list side-by-side in .page2-content. [1] [2]

Schedule display improvements:

• Updated ScheduleDisplay to use a new tile-style layout with a header and icon, and improved the "No classes today" message for consistency with the new UI style. [1] [2]

CSS fixes and cleanup:

• Fixed CSS comment syntax in style.css by converting invalid // comments to proper block comments, preventing CSS parsing errors. [1] [2]

[amah853]

@nicolaschan any update on this PR? thanks.