This pull request refactors several UI components in the calendar generator to remove Material UI (MUI) dependencies and replace them with Tailwind CSS and Lucide icons. It also includes minor logic improvements and code cleanups in CourseTimelineComponent. The result is a more lightweight codebase with improved consistency in styling and icon usage.

UI Library Migration and Styling Updates:

• Replaced all MUI imports, components (Box, Typography, Tooltip, etc.), and icons in CalendarNavBar.jsx and CourseTimelineComponent.jsx with Tailwind CSS classes and Lucide icons for a consistent and lightweight UI.
• Updated layout and visual styling in CalendarNavBar.jsx and CourseTimelineComponent.jsx to use Tailwind utility classes, improving maintainability and visual consistency.

Icon Replacement:

• Swapped MUI icons (e.g., NavigateBeforeIcon, InfoIcon, CancelIcon) for Lucide icons (ChevronLeft, Info, CircleX, etc.) throughout navigation and info buttons in CalendarNavBar.jsx.

Code and Logic Improvements:

• Improved parsing and matching logic in CourseTimelineComponent.jsx for date/duration calculations by specifying radix in parseInt calls and clarifying destructuring assignments.
• Renamed variables for clarity in mouse event handlers and timeline calculations (clickX → hoverX, clickPercent → hoverPercent, etc.).
• Removed unused state and props (noCourses) from CalendarComponent.jsx and CalendarNavBar.jsx for cleaner code.

Dependency Cleanup:

• Removed all MUI and Emotion dependencies from package.json, reducing bundle size and eliminating unused libraries.

Theme Script Update:

• Simplified and improved the theme-setting script in index.html to use local storage and native color scheme toggling, ensuring better performance and user experience.