🎨 Palette: Add encouraging empty state for high score

[EiJackGH]

💡 What: Added an encouraging empty state ("None yet! Go set a record!") to the high score display when the player's personal best is 0.

🎯 Why: In CLI applications, hiding UI elements when data is empty leaves users wondering if the system is tracking their progress. Providing an explicit empty state clarifies the system state and gives new users an immediate, actionable goal.

📸 Before/After:
Before: ==========================\n SPEED CLICKER\n==========================\n\nControls:\n ... (Score hidden entirely)
After: ==========================\n SPEED CLICKER\n==========================\n Personal Best: None yet! Go set a record!\n\nControls:\n ...

♿ Accessibility: Improves cognitive accessibility by explicitly confirming to new users that their progress (or lack thereof) is being tracked and providing clear guidance on what to do next.

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PR created automatically by Jules for task 9691857344491002740 started by @EiJackGH

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