[Performance] Optimize linesToColumns

[gonzaloriestra]

WHY are these changes introduced?

The linesToColumns function currently performs two passes over the input data and calls the expensive unstyled utility (which uses regex to strip ANSI codes) multiple times for the same strings. This introduces measurable overhead in CLI output generation.

WHAT is this pull request doing?

• Optimizes linesToColumns to use a single pass that caches the unstyled lengths of each cell.
• Reduces calls to the expensive unstyled utility by 50%.
• Eliminates redundant intermediate array mappings.
• Adds an early return for empty or nullish input to improve robustness.

How to test your changes?

CI

Post-release steps

None

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 12050113292855011574 started by @gonzaloriestra

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