Enhance CLI output with ASCII dashboard and fix quiet mode

[EiJackGH]

🎨 Palette: Improved CLI UX with Dashboard Report

💡 What:

• Replaced the plain text final report with a structured ASCII box dashboard.
• Consolidated duplicate Colors class definitions in bitcoin_trading_simulation.py.
• Fixed a bug where "Daily Trading Ledger" and trade logs were printed even in --quiet mode.
• Added ROI % and Total Trades (Buys/Sells) to the final report.

🎯 Why:

• Users found the plain text output hard to parse at a glance.
• The --quiet flag was broken, cluttering the output when running batch simulations.
• Duplicate code (Colors class) was a maintenance risk and caused test failures.

📸 Before/After:
Before:

------ Final Portfolio Performance ------
Initial Cash: $10000.00
Final Portfolio Value: $10000.00
💰 Profit/Loss: $0.00
Buy and Hold Strategy Value: $9718.99
-----------------------------------------

After:

╔══════════════════════════════════════════╗
║       Final Portfolio Performance        ║
╠══════════════════════════════════════════╣
║ Initial Cash:             $     10,000.00 ║
║ Final Value:              $     10,000.00 ║
║ 💰 Profit/Loss:          $          0.00 ║
║    ROI:                            0.00% ║
╠══════════════════════════════════════════╣
║ Trades (B/S):                         0/0 ║
║ Buy & Hold:               $      9,718.99 ║
╚══════════════════════════════════════════╝

♿ Accessibility:

• Improved readability with clear structure and alignment.
• --quiet mode now works correctly for screen reader users who want less verbosity.

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PR created automatically by Jules for task 3070512735153693794 started by @EiJackGH

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