🎨 Palette: Prevent trailing text artifacts during dynamic terminal updates

[EiJackGH]

💡 What: Added the ANSI escape sequence \033[K (Erase in Line) immediately following carriage returns (\r) in terminal output strings, and removed the previously hardcoded padding spaces.

🎯 Why: When dynamically updating a single line in a CLI (e.g., scores, timers), using a carriage return simply moves the cursor back to the start of the line. If the new string is shorter than the previously rendered string, the end of the old string will still be visible as a "trailing artifact." Previously, the code relied on hardcoding multiple spaces to artificially pad strings and overwrite this leftover text, which is brittle. Using \033[K robustly clears the line from the cursor to the end, preventing any artifacts regardless of string length.

📸 Before/After:
Before: std::cout << "\rGO! \n" << std::flush;
After: std::cout << "\r\033[KGO!\n" << std::flush;

♿ Accessibility: This UX polish ensures terminal readers and visual users don't encounter confusing or garbled text during rapid UI updates. Additionally, a new learning entry was recorded in .Jules/palette.md to establish this standard for future interactions.

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PR created automatically by Jules for task 4127214504803152438 started by @EiJackGH

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