🎨 Palette: Highlight personal best achievement message at game exit

[aidasofialily-cmd]

This PR adds bold yellow formatting (CLR_CTRL) and celebratory emojis (✨ NEW BEST! 🥳) to the personal best achievement message displayed when a player completes a run with a new high score.

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PR created automatically by Jules for task 6579307405564819962 started by @aidasofialily-cmd

[google-labs-jules]

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