🎨 Palette: Improved input responsiveness and visual feedback

[aidasofialily-cmd]

This PR introduces a micro-UX improvement to the SPEED CLICKER game:

1. Immediate Feedback: The score display now updates instantly when a user "clicks" (presses a key), providing a more tactile and responsive feel.
2. Visual Polish: The game display now stays on a single line even during mode toggles, avoiding messy terminal output and scrolling.
3. Improved Efficiency: The game loop now uses a dynamic poll() timeout instead of a fixed sleep_for(10ms), following best practices for real-time CLI applications.
4. Documentation: Recorded the "Tactile CLI Feedback" learning in the Palette journal.

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PR created automatically by Jules for task 4914052454992541766 started by @aidasofialily-cmd

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