These buttons fire mock GA4 hits at google-analytics.com/g/collect.
The real request to Google will fail (expected) — what matters is that the
collector captures a copy and POSTs it to ingest. Watch the Network tab for
the ingest POST, then check Firestore.
Load order modes: ?siteId=…&preload=1 fires a page_view
before injecting the collector (expect partialCapture:true on the
health doc and an event with transport:"observer");
&consent=1 pushes a Consent Mode default before load (expect
consentPending:true).