🎨 Palette: Improve score readability and game-over context

[aidasofialily-cmd]

This PR introduces small but impactful micro-UX improvements to the SPEED CLICKER game:

1. Readability: Scores now include thousands separators (e.g., 1,234) instead of raw numbers, making them much easier to read at a glance.
2. Visual Polish: The live score line now uses the ANSI \033[K (Erase in Line) sequence. This ensures that when the score or status message changes length, no leftover characters from the previous update remain on the screen, providing a much cleaner "tactile" feel.
3. Achievement Context: When a player breaks their personal record, the game-over screen now explicitly shows their previous best score (e.g., "You beat your previous best of 10!"). This provides meaningful context and enhances the user's sense of accomplishment.

♿ Accessibility: Improved numeric readability is a key accessibility win for users with cognitive or visual impairments. The use of standard ANSI clearing sequences improves compatibility across different terminal emulators.

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PR created automatically by Jules for task 3421603949046176275 started by @aidasofialily-cmd

[google-labs-jules]

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