Updates .gitignore to exclude user data

Ensures that project-specific user data within the xcworkspace directory is excluded from version control, preventing potential conflicts and maintaining user-specific settings locally.

Refactors card overlay into its own view

Moves the card overlay logic into a dedicated `CardOverlay` struct
for better organization and reusability. This change improves code
readability and maintainability by encapsulating the overlay's
implementation. Additionally, the color extension was modified to use UInt64 instead of CGFloat

Removes trailing newlines

Removes unnecessary trailing newlines from the end of files.
This cleans up the codebase and avoids potential linting issues.

Update README.md

Removes project-specific user data

Removes user-specific Xcode settings and breakpoints to ensure a clean and consistent project configuration across different development environments.
This prevents potential conflicts and ensures reproducibility.