Scenario: AJAX submit, then simulate "processing..." UI in same page, then redirect
Expected Behavior: AJAX → Processing UI → 3s delay → Redirect
PRD Reference: AC-1.4.4
Future Use: This page will be used to test whether the ListenLayer tracking script can capture form data when processing UI is simulated without page navigation.
Note: This form simulates a processing page by showing an overlay in the same page (no page navigation). After 3 seconds, it redirects to the thank-you page.
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