Add Support for Tracking UTMs and Other Key Submission Data

• utm_source – Where the traffic came from (e.g., facebook, newsletter, referral_partner).

• utm_medium – The marketing channel (e.g., cpc, email, social).

• utm_campaign – The specific campaign name or promotion (e.g., spring_sale, launch_event).

• utm_term – Paid keyword or search term (useful for PPC).

• utm_content – Variation of ad or link (e.g., banner_a, cta_blue_button).

Other potential items to track:

• landing_page – First page the visitor saw.

• form_page_url – Page where they filled the form.

• referrer_url – Where they came from before arriving.