🎨 Palette: Add visual indicator for truncated command suggestions

[google-labs-jules]

💡 What: Added a visual indicator (... and X more command(s)) to the CommandSuggestionList component when the total number of available commands exceeds the number currently displayed on screen.

🎯 Why: To improve discoverability. Without this indicator, users might incorrectly assume that the visible list represents the entire set of available commands. This simple micro-interaction gives them immediate feedback that more options exist if they scroll or refine their search.

📸 Before/After: N/A - Visual text addition only in a React Ink component.

♿ Accessibility: The addition provides context directly into the DOM/terminal output stream which helps users (and screen readers parsing terminal text) understand the full scope of available choices without guessing.

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PR created automatically by Jules for task 6532757263794765400 started by @YoungSx

[google-labs-jules]

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