🎨 Palette: Enhanced CLI output with colors and emojis

[google-labs-jules]

💡 What: Added ANSI color codes and emojis to the simulation output.
🎯 Why: To make the trading ledger and final performance summary easier to scan and more visually engaging.
📸 Before/After: Added green for Buy/Profit, red for Sell/Loss, purple for headers.
♿ Accessibility: Improved visual hierarchy and distinction between positive and negative outcomes.
Also fixed a Pandas FutureWarning regarding explicit casting.

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PR created automatically by Jules for task 11642824777338296529 started by @EiJackGH

[google-labs-jules]

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