🎨 Palette: Format financial values with thousands separators in daily ledger

[EiJackGH]

💡 What:

Formatted financial numbers (price, cash, total_value) and BTC amounts in the daily simulation ledger with thousands separators (e.g., , formatting).

🎯 Why:

To improve readability and significantly reduce cognitive load for users when scanning dense numerical outputs in the CLI, matching the UX pattern already implemented in the final summary report.

📸 Before/After:

Before:
🟢 Day 12: Buy 0.1234 BTC at $45000.00
Day 12: Portfolio Value: $12000.00, Cash: $1000.00, BTC: 0.1234

After:
🟢 Day 12: Buy 0.1234 BTC at $45,000.00
Day 12: Portfolio Value: $12,000.00, Cash: $1,000.00, BTC: 0.1234

♿ Accessibility:

No specific technical a11y attributes added (as this is a CLI), but formatting large numbers with separators is a recognized cognitive accessibility best practice for neurodiverse users (and all users).

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PR created automatically by Jules for task 14682114135537787579 started by @EiJackGH

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