UX Improvement and bug fixes

[Mehdi-Bl]

Added

• Dark Mode support
• Live token count updates during file selection
• Separated include/exclude configuration boxes for better organization
• Auto detect and exclude binary files
• Use .gitignore to exclude files/folders

Improved

• Enhanced UX/UI with better spacing and visual hierarchy
• Faster UI rendering and response times
• Simplified text entry for file patterns (vs. YAML format)

Fixed

• Multiple bug fixes in file selection and processing
• Added robust testing for file selection edge cases