🎨 Palette: Improve CLI UX with colors and emojis

[google-labs-jules]

💡 What: Improved the CLI output of the bitcoin trading simulation by adding colors and emojis. Also fixed a pandas warning.
🎯 Why: To make the simulation results easier to scan and understand at a glance, and to remove distracting warnings.
📸 Before/After:

• Before: Plain text output, pandas warning interspersed.
• After:
  • Headers in Purple/Bold.
  • Buy events: 🟢 Green.
  • Sell events: 🔴 Red.
  • Profit: 💰 Green.
  • Loss: 📉 Red.
  • No warnings.
    ♿ Accessibility: High contrast colors (Green/Red) aid in quickly distinguishing positive and negative outcomes. Standard emojis provide visual anchors.

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PR created automatically by Jules for task 15201687343967991427 started by @EiJackGH

[google-labs-jules]

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