[appdevelopsk]

The current catalog_filter_landing labels every /apps?goal=... load as source=editorial_guide, including direct, bookmarked, and shared URLs. This falsely attributes traffic to our four guides. New logic compares only same-origin document.referrer path to the specific allowed guide matching the goal; reports source=editorial_guide only when matched and otherwise direct_or_shared, including suppressed/malformed referrers. No raw referrer URL or search text is sent to GA4. Existing 92 Play cards, five detail links, and manual category events unchanged. Update offline source regression test and add matching-guide guard; now ten Python test methods in that module, not executed in container. Locally executed a Node.js equivalent logic test with 9/9 cases (four guide types, missing/invalid/cross-origin/wrong guide cases). No GitHub Actions, deployment, or proof of GA4 delivery.