🎨 Palette: [UX] Format large financial numbers in daily ledger

[EiJackGH]

💡 What: Added , thousands separators to financial and BTC value print statements in the daily trading ledger loop (bitcoin_trading_simulation.py).
🎯 Why: When running simulations with large initial-cash values (e.g. $1,000,000), numbers like $1000000.00 are incredibly difficult to parse quickly in the terminal. Using $1,000,000.00 significantly reduces cognitive load.
📸 Before/After:
Before:
Day 20: Portfolio Value: $1000000.00, Cash: $1000000.00, BTC: 0.0000
After:
Day 20: Portfolio Value: $1,000,000.00, Cash: $1,000,000.00, BTC: 0.0000
♿ Accessibility: Improves scanability and reduces cognitive load when analyzing large blocks of numerical output in the CLI.

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PR created automatically by Jules for task 11630905783650143991 started by @EiJackGH

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