🎨 Palette: Add empty state for personal best

[EiJackGH]

💡 What: Added an explicit, encouraging empty state ("None yet! Play to set a record!") to the Personal Best display when the user's high score is 0.

🎯 Why: In CLI applications, a missing piece of UI (like omitting the Personal Best text entirely) when data is empty can feel broken or unpolished. Providing an explicit empty state clarifies the system state to the user and improves the onboarding experience, encouraging them to play.

📸 Before/After:

• Before: First-time players see no mention of a Personal Best at all.
• After: First-time players see: Personal Best: None yet! Play to set a record!

♿ Accessibility: N/A for this specific CLI change, though it improves general usability and cognitive clarity for new users.

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PR created automatically by Jules for task 14513075707957072836 started by @EiJackGH

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