🎨 Palette: Add CLI arguments for customization and accessibility

[google-labs-jules]

💡 What: Refactored the script to use argparse. Added support for configuration (--days, --initial-cash) and display options (--quiet, --no-color).
🎯 Why: To make the tool more usable without code edits and accessible to users who cannot view colors or prefer less verbose output.
♿ Accessibility: Added --no-color flag for accessibility.

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PR created automatically by Jules for task 18307836749879557825 started by @EiJackGH

[google-labs-jules]

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