[Feature] Command palette: show full description beyond 2-line truncation

Summary

When searching for commands or skills via /, the description text in the autocomplete palette is truncated at 2 lines with no way to see the rest.

Current behavior

Typing / and filtering commands shows each entry with its description clipped to 2 lines. There is no way to expand or scroll the description, even for longer skill descriptions.

Desired behavior

One or more of:

• Wrap description text beyond 2 lines (e.g. up to 4–5 lines, or dynamically sized)
• Show the full description on hover (for GUI/IDE contexts)
• Show the full description when an item is selected/highlighted in the palette

Why it matters

Plugin skills and custom commands often have multi-sentence descriptions that are meaningful for disambiguation. The 2-line cap forces authors to choose between a useful description and one that fits the truncation — especially painful for skills with similar names.

Environment

• Claude Code CLI (terminal + Ghostty)
• Also relevant for IDE extensions where hover tooltips may be feasible