Box the setup welcome art to align correctly in clack prompts

[Copilot]

The setup welcome screen was rendered through @clack/prompts intro(), which applies a leading prompt prefix to only the first line. That caused the multi-line clark/prompt welcome art to appear shifted left relative to the rest of the interaction.

• Welcome prompt rendering

  • Replace the setup entry banner from p.intro(...) to a boxed p.note(...) presentation.
  • Keep the existing pixel-art logo and badge content unchanged, but render them as one framed block so the layout stays visually aligned within the prompt flow.

• Regression coverage

  • Add a focused setup UI test that asserts runSetup() renders the boxed welcome output before shell validation.
  • This locks in the intended prompt primitive so future prompt refactors do not reintroduce the alignment issue.

• Result

  • The welcome art now participates in the same framed interaction model as the rest of the prompt UI instead of relying on a single-line intro prefix.

export async function runSetup({ defaults = false } = {}) {
  p.note(getWelcomeMessage(), "Welcome");

  if (!isZshShell()) {
    p.log.error("Suitup setup must be run from zsh.");
    // ...
  }
}

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