🎨 Palette: Improve score readability and UI polish

[aidasofialily-cmd]

💡 What: The UX enhancement added

• Added a formatWithCommas utility function to format large scores (e.g., "1,234,567" instead of "1234567").
• Implemented CLR_EOL (\033[K) for robust terminal line clearing, replacing manual space padding.
• Enhanced the start screen, live HUD, and game-over summary with consistent bold coloring and better context (displaying the previous personal best on new records).

🎯 Why: The user problem it solves

• Large scores were difficult to read at a glance in a fast-paced game.
• The HUD occasionally flickered or left "ghost" characters when score length changed.
• Players lacked immediate context on how much they had improved their record.

♿ Accessibility: Any a11y improvements made

• Improved visual hierarchy using bold terminal colors to distinguish labels from values.
• Standardized interactive key hints (e.g., [Any key]) for consistent instructional design.

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PR created automatically by Jules for task 7149532912222858465 started by @aidasofialily-cmd

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