pixel: add ensure fbc fallback

src/lib/metapixel/MetaPixel.svelte

@@ -11,6 +11,7 @@ PixelControl interface.
 	import type { TrackingManager } from '../tracking.svelte.ts';
 	import { onNavigate } from '$app/navigation';
 	import { PixelControl, type PixelControlOptions } from './pixel-control.ts';
+	import { ensureFbc, type EnsureFbcOptions } from './fbc.ts';
 
 	interface Props {
 		/**
@@ -37,6 +38,11 @@ PixelControl interface.
 
 	let pixel = $state<PixelControl | null>(null);
 
+	const ensureFbcOptions: EnsureFbcOptions = $derived({
+		sameSite: 'Lax',
+		pixelLoaded: PixelControl.baseLoaded && !PixelControl.baseFailed
+	});
+
 	onMount(() => {
 		if (!trackingManager) {
 			throw new Error('MetaPixel component requires a TrackingManager to manage consent.');
@@ -47,6 +53,7 @@ PixelControl interface.
 		trackingManager.runWithConsent(() => {
 			if (autoPageView && pixel) {
 				pixel.pageView();
+				ensureFbc(ensureFbcOptions);
 			}
 		});
 	});
@@ -55,6 +62,7 @@ PixelControl interface.
 		trackingManager?.runWithConsent(() => {
 			if (autoPageView && pixel) {
 				pixel.pageView();
+				ensureFbc(ensureFbcOptions);
 			}
 		});
 	});