[Bug] Autocomplete dropdown truncates skill/command descriptions regardless of terminal width

Bug Description
## Skill/command descriptions truncated in autocomplete dropdown

When typing / to invoke a skill or command, the autocomplete dropdown truncates descriptions regardless of terminal width. Even on a maximized fullscreen terminal, long descriptions are cut off with no way to read them fully.

Current behavior: Descriptions are hard-truncated to fit a single line in the dropdown. No tooltip, wrap, or expand mechanism exists.

Expected behavior: One or more of:

• Descriptions wrap to multiple lines or show a tooltip/preview pane on hover/selection
• A secondary panel appears below the dropdown showing the full description of the highlighted item
• The dropdown width adapts to the longest description (with a reasonable max)
• Arrow-key selection reveals the full description in a detail area

Screenshot:
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Environment: macOS, Claude Code CLI (latest), standard terminal (full width)

This makes it difficult to discover and differentiate between skills, especially when multiple skills have similar names but different purposes (e.g., several responsive-mobile-first skills).

Environment Info

• Platform: darwin
• Terminal: WarpTerminal
• Version: 2.1.70
• Feedback ID: 6fbaadd7-ddc5-48db-aafa-a76d723f2630

Errors

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