🎨 Palette: Improve score readability and HUD polish

[aidasofialily-cmd]

This PR introduces several micro-UX improvements to the "Speed Clicker" terminal game to enhance readability and visual polish.

💡 What:

• Added a formatWithCommas helper to format scores with thousands separators (e.g., 1,000,000 instead of 1000000).
• Implemented the CLR_EOL macro (\033[K) to replace fragile space-padding for line updates.
• Standardized HUD styling by applying consistent colors to both labels and values.

🎯 Why:

• Large numbers are difficult to read at a glance in a fast-paced game; commas provide immediate visual grouping.
• Manual space padding can leave visual artifacts if the line length fluctuates; CLR_EOL ensures a clean terminal state.
• Consistent color coding helps users quickly distinguish between different HUD elements.

♿ Accessibility:

• Improved visual contrast and information hierarchy through consistent color usage and formatted numeric data.

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PR created automatically by Jules for task 6643702494115697253 started by @aidasofialily-cmd

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