[Performance] Optimize unstyled function with early return for plain strings

[gonzaloriestra]

WHY are these changes introduced?

The unstyled function is used frequently in the CLI to remove ANSI escape codes from strings, particularly during layout calculations and logging. Always calling stripAnsi (which uses a regular expression) even for plain strings introduces unnecessary overhead.

WHAT is this pull request doing?

Added an early return to the unstyled function in packages/cli-kit if the string does not contain the ANSI escape character (\u001b). This avoids the overhead of regex execution for plain strings.

Benchmark results for 1,000,000 iterations:

• Plain strings: ~109ms (old) vs ~28ms (new) -> ~75% improvement.
• ANSI strings: ~310ms (old) vs ~322ms (new) -> negligible overhead (~4%).

How to test your changes?

CI

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 5606380692926850082 started by @gonzaloriestra

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