🎨 Palette: Improve screen reader accessibility for command navigation hints

[google-labs-jules]

💡 What: Replaced symbolic navigation hints (↑↓, ⏎) with screen-reader friendly text (Up/Down, Enter).
🎯 Why: Screen readers in CLI environments rely on raw text output and fail to announce purely symbolic text properly. This change ensures colorblind and visually impaired users navigating via screen readers can understand the keyboard navigation hints.
📸 Before/After:
Before: ↑↓ nav · ⏎ select · esc close
After: Up/Down nav · Enter select · Esc close
♿ Accessibility: Improved screen reader compatibility by using readable text for navigation instructions instead of raw symbols.

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PR created automatically by Jules for task 17629315432946776747 started by @YoungSx

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