Add admin visibility and affiliation indicators on people index

[maebeale]

What is the goal of this PR and why is this important?

• Admins need to quickly identify unpublished people in the people index
• Affiliation labels should distinguish facilitator vs non-facilitator roles
• Profile button hover was inflating Ahoy view counts via Turbo prefetch

How did you approach the change?

• Added admin-only bg-blue-100 row styling for unpublished people, matching the existing workshop index pattern
• Changed affiliation column to iterate over affiliations (not organizations) so per-affiliation styling can be applied
• Added grey left border on non-facilitator affiliation labels to visually distinguish facilitator affiliations
• Added turbo_prefetch: false to person_profile_button and organization_profile_button helpers to prevent hover prefetch from triggering Ahoy view tracking

UI Testing Checklist

• People index shows blue background on rows for unpublished people (not searchable or no active affiliations)
• Facilitator affiliation labels have no left border; non-facilitator labels have grey left border
• Hovering profile buttons does NOT trigger network requests to show pages
• Clicking profile buttons still navigates correctly

Anything else to add?

• The turbo_prefetch: false fix applies globally to all callers of both helpers, not just the people index

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