fix(showcase): layout grid acceptance test

[aklkv]

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Jira ticket: HDS-XXX
Figma file: [if it applies]

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Project	Deployment	Preview	Updated (UTC)
hds-showcase	Ready	Preview	Nov 4, 2025 6:26pm
hds-website	Ready	Preview	Nov 4, 2025 6:26pm

[shleewhite]

We can supress the color contrast errors for now, you just need to add:

let axeOptions = {
      rules: {
        'color-contrast': {
          enabled: false,
          selectors: [['.shw-placeholder']],
        },
      },
    };

and pass that to a11yAudit