feat(theme): локальный выбор и показанная тема handoff (#13)

components/form.php

@@ -198,6 +198,8 @@ $basePickerAccept = 'image/jpeg,image/png,image/gif,image/webp,image/bmp,image/a
 		function redirectToTour(record) {
 			let targetUrl = record.meta.redirectBase + encodeURIComponent(record.key);
 			if (record.meta.redirectUtm) targetUrl += '&' + record.meta.redirectUtm;
+			const shownTheme = window.ZoomzillaTheme.current();
+			targetUrl += '&shown_theme=' + encodeURIComponent(shownTheme);
 			window.PublicNavigationGuard.allowNavigation(() => { window.location.href = targetUrl; });
 		}