feat(bf): trial widget + booking link beside the HOST27 deal

On /odoo-black-friday/ the offer row is now two columns at >=901px: the deal (left,
unchanged and still the single dominant primary) with the free trial and a booking
link beside it (right, deliberately smaller and quieter).

- Trial: the existing #trialCard/#trialForm moves verbatim from the features grid into
  the row's aside. Same ids, same static/black-friday.js handler, same consent gate and
  label (AW-18065522009/AtAPCIjjvrAdENn6p6ZD) — no second trial mechanism.
- Booking: a plain <a target=_blank rel=noopener> to Oliver's verified Google
  appointment page (no iframe). Its click fires AW-18065522009/P0j5CPiCv7AdENn6p6ZD
  through the same gate via window.o4pAds.bookConversion; the click is never
  preventDefault-ed, so a blocked tag can never stop the link opening.
- ads-consent.js gains the booking label (from the page, not hard-coded) and the
  bookConversion hook; the buy path is untouched.

Deal buy stays the dominant action; ONE plausible Buy mark; one price; countdown pair
unchanged.

static/ads-consent.js

@@ -170,6 +170,7 @@
       id: id,
       sendTo: sendTo,
       trialSendTo: banner.getAttribute("data-ads-trial-send-to"),
+      bookSendTo: banner.getAttribute("data-ads-book-send-to"),
     };
 
     var choice = readChoice();
@@ -210,6 +211,21 @@
     fireConversion(cfg.trialSendTo, action);
   };
 
+  /* ---- the booking conversion: fired on a click of the booking link ---- *
+   * The booking happens on Google's domain, off-site, so a click is all we can observe. The
+   * caller does NOT preventDefault: the link opens in a new tab on its own, so even a blocked,
+   * slow or absent tag can never stop the booking page from opening — this only ADDS the event.
+   * Without consent (or the label) it fires nothing and simply runs the (optional) action.
+   */
+  window.o4pAds.bookConversion = function (action) {
+    if (typeof action !== "function") action = function () {};
+    if (!cfg || !cfg.bookSendTo || !isGranted() || typeof window.gtag !== "function") {
+      action();
+      return;
+    }
+    fireConversion(cfg.bookSendTo, action);
+  };
+
   if (document.readyState === "loading") {
     document.addEventListener("DOMContentLoaded", init);
   } else {