🎨 Palette: [UX improvement] Add comma formatting to scores and enhance achievement feedback

[aidasofialily-cmd]

💡 What: The UX enhancement added

This PR introduces thousand separators (commas) to all numeric displays in the Speed Clicker game and enhances the "New Best" achievement feedback.

🎯 Why: The user problem it solves

Large numbers in clicker games are difficult to read at a glance. Adding commas makes scores like 1234567 much easier to parse as 1,234,567. Additionally, showing the previous high score during a record-breaking run provides better context for the player's achievement.

♿ Accessibility: Any a11y improvements made

• Improved cognitive ease by grouping digits, making large numbers more accessible to users with dyscalculia or general reading difficulties in fast-paced environments.
• Added visual and contextual clarity to state changes (new high score).

🛠️ Technical Details

• Added a robust formatWithCommas helper function in C++.
• Verified logic with a standalone test suite covering edge cases (zero, negative, large numbers).
• Maintained consistent terminal formatting and ensured no regressions in UX standards (cursor handling, etc.).

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PR created automatically by Jules for task 15976917118235747829 started by @aidasofialily-cmd

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