Add audit timestamps to edit pages with Ahoy event tracking

[Copilot]

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

Edit pages lacked visibility into resource creation/modification history. Users couldn't see when records were created or last updated, or track change history without navigating to separate admin tools.

How did you approach the change?

Shared partial for audit metadata (app/views/shared/_audit_info.html.erb)

• Displays created_at and updated_at timestamps with user attribution
• Supports multiple association patterns: created_by, updated_by, or fallback to user
• Links to Ahoy events filtered by resource_type and resource_id (admin-only)
• Positioned bottom-right with subtle styling

Controller enhancement (app/controllers/admin/ahoy_activities_controller.rb)

• Added resource_type and resource_id filtering to events index
• Enables direct navigation from edit pages to filtered event history

Rollout

• Applied to 25 edit pages across all major resource types

Example rendering:

Created: Feb 15, 2026 at 4:30 PM by John Doe 📊
Last updated: Feb 15, 2026 at 5:45 PM by Jane Smith 📊

Anything else to add?

Time format uses %-l to avoid leading spaces in single-digit hours. Authorization check (allowed_to?(:index?, :ahoy_activity)) restricts Ahoy links to admins only.

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