🎨 Palette: Erase Dynamic Lines using ANSI \033[K

[EiJackGH]

💡 What: The UX enhancement added an ANSI escape sequence \033[K to clear the terminal line when text is updated dynamically via carriage return \r.
🎯 Why: The user problem it solves is preventing "trailing artifacts" where a longer string on the line isn't fully overwritten by a shorter new string. The old approach of hardcoding 11-15 spaces after the string was brittle and error-prone.
📸 Before/After: Not applicable (invisible visual polish that prevents artifacts from forming).
♿ Accessibility: N/A, but improves visual coherence of the UI.

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PR created automatically by Jules for task 1136015281669970418 started by @EiJackGH

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