Improve console readability with color formatting for better contrast

[Copilot]

This PR addresses readability concerns by implementing a comprehensive color scheme throughout the console application to ensure better contrast and visual clarity.

Changes Made

Console Color Implementation:

• Added ConsoleColor formatting to all user-facing text elements
• Implemented consistent color scheme across all application modules
• Added proper color reset calls to prevent color bleeding

Color Scheme:

• Cyan: Section headers ("Choose an option:", "Reverse String", etc.)
• Green: Input prompts and positive results/confirmations
• Yellow: Result headers and the exit option highlight
• White: Menu items and user input results display
• Red: Error messages and negative results
• DarkGray: Continuation prompts ("Press Enter to continue...")

Files Modified:

• Program.cs: Enhanced main menu, input prompts, and result display
• PrintOperations.cs: Added colors to pattern printing and palindrome checker
• Mathoperations.cs: Improved area calculation and prime number checker display

Benefits

• Better Contrast: High contrast colors ensure text is easily readable against various terminal backgrounds
• Visual Hierarchy: Different colors help users quickly identify different types of information
• User Experience: Color coding provides immediate visual feedback (green for success, red for errors)
• Accessibility: Thoughtful color choices improve readability for users with different visual preferences

The implementation ensures that font visibility and contrast issues are resolved, making the application significantly more readable and user-friendly.

Fixes #8.

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