🎨 Palette: Improved score readability and achievement feedback

[aidasofialily-cmd]

🎨 Palette: Improved score readability and achievement feedback

💡 What: The UX enhancement added

• Introduced a thousand-separator formatter (1,234,567) for all score and highscore displays.
• Enhanced the "NEW BEST!" live feedback with contextual information (previous score) and visual flair (emoji + yellow highlight).
• Added proper color resets to the HUD to prevent UI bleed.

🎯 Why: The user problem it solves

• Raw large integers (e.g., 1234567) are difficult to read at a glance in a fast-paced clicker game. Comma formatting makes the score immediately readable.
• The previous "NEW BEST!" message lacked context; users now see exactly how much they've improved by seeing their old record.

♿ Accessibility

• Improved readability of numeric data through standard thousands-separators.
• Enhanced visual hierarchy of achievements using color and symbolic indicators.
• Ensured terminal state consistency with proper ANSI reset sequences.

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PR created automatically by Jules for task 18072129861810513636 started by @aidasofialily-cmd

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