🎨 Palette: Improve accessibility of keyboard navigation hints

[google-labs-jules]

💡 What: Replaced symbolic characters (↑↓, ⏎, esc) with screen-reader friendly text (Up/Down, Enter, Esc) in the CommandSuggestionList footer.
🎯 Why: Screen readers in CLI environments rely on raw text output and fail to announce purely symbolic text properly, which causes an accessibility regression for users relying on assistive technology.
📸 Before/After:
Before: ↑↓ nav · ⏎ select · esc close
After: Up/Down nav · Enter select · Esc close
♿ Accessibility: Improved screen reader announcements for keyboard navigation controls.

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PR created automatically by Jules for task 1279861711359993449 started by @YoungSx

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