🎨 Palette: Improve accessibility of navigation hints

[google-labs-jules]

💡 What: Replaced symbolic navigation hints (↑↓, ⏎) with screen-reader friendly descriptive text (Up/Down, Enter).
🎯 Why: Screen readers in CLI environments rely on raw text output and fail to announce symbolic text properly, causing an accessibility issue for visually impaired users.
📸 Before/After: N/A
♿ Accessibility: Improved keyboard navigation hints for screen readers.

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PR created automatically by Jules for task 2893266540305379694 started by @YoungSx

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