Add Dark Mode Feature

[Klvvr1]

### Description
To improve user experience and reduce eye strain in low-light environments, we need to implement a dark mode theme across the entire application. This feature should allow users to toggle between light and dark themes, with the preference being saved for future sessions.

### Goals

• Enhance accessibility and user comfort during nighttime usage.
• Provide a modern, user-preferred customization option.
• Ensure consistent visual design across both themes.

[ahmedalbatati3]

Closes #17

[Klvvr1]

Mistake in Re-Opening the Old Branch From Local Cause Conflict in Code