Improve cross-domain tracking and add "Always" script category

Move linker config into gtag('config') call with accept_incoming and
decorate_forms for reliable cross-domain linking. Capture _gl parameter
in sessionStorage to preserve attribution across navigation. Add
referrer-based attribution replay fallback so GA4 reports source/medium
instead of (not set) when UTMs are absent. Add "Always" script category
that executes without waiting for consent.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/js/consent-manager.js

@@ -65,6 +65,7 @@ var AttConsent = (function() {
 			wp_set_consent('statistics',  categories.analytics  ? 'allow' : 'deny');
 			wp_set_consent('marketing',   categories.marketing  ? 'allow' : 'deny');
 		}
+
 	}
 
 	/**
@@ -88,6 +89,28 @@ var AttConsent = (function() {
 			if (a.ut) { params.campaign_term    = a.ut; }
 			if (a.uo) { params.campaign_content = a.uo; }
 
+			// If no UTMs/gclid, derive source/medium from referrer so GA4
+			// doesn't report (not set). Important for cross-domain tracking
+			// where the _gl param may have been lost before consent was granted.
+			if (!a.us && !a.gc && a.r) {
+				try {
+					var ref = new URL(a.r);
+					var linkerDomains = config.linker_domains || [];
+					var isLinkerDomain = linkerDomains.some(function(d) {
+						return ref.hostname === d || ref.hostname.endsWith('.' + d);
+					});
+					// Only set referral attribution if referrer is from a different
+					// host and NOT a configured cross-domain linker domain (those
+					// should be seamless continuations, not referrals).
+					if (ref.hostname !== window.location.hostname && !isLinkerDomain) {
+						params.campaign_source = ref.hostname;
+						params.campaign_medium = 'referral';
+					}
+				} catch (e) {
+					// Invalid referrer URL - skip.
+				}
+			}
+
 			if (Object.keys(params).length > 0) {
 				gtag('set', params);
 			}