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/black-friday.js

@@ -375,6 +375,20 @@
     }
   })();
 
+  /* ---- Booking link — fire the Google Ads booking conversion on the click, through the same
+     consent gate as the buy and trial conversions. The link is a plain <a target="_blank">, so
+     the click is never preventDefault-ed: the Google appointment page opens regardless, and a
+     blocked, slow or absent tag merely skips the event. Fires nothing without consent. ---- */
+  (function () {
+    var link = document.getElementById('bookingCTA');
+    if (!link) return;
+    link.addEventListener('click', function () {
+      if (window.o4pAds && typeof window.o4pAds.bookConversion === 'function') {
+        window.o4pAds.bookConversion();
+      }
+    });
+  })();
+
   /* ---- Footer contact form ---- */
   (function () {
     var form = document.getElementById('footerContactForm');