refactor(bf): hold the Google Ads id/label in the page, keep ads-consent.js generic

Tag id + conversion label now live as data-ads-id / data-ads-send-to on the banner
element, so the served HTML carries the tag config and the script stays reusable
(missing config -> inert). Re-verified: no cookie/request before consent, cookies +
tag after Accept, conversion + form submit on click, 700 ms fallback submit with the
tag blocked.

static/ads-consent.js

@@ -1,6 +1,9 @@
 /* ads-consent.js — Google Ads tag, gated behind a consent banner. Page-side only.
  *
  * Page: /odoo-black-friday/. Companion to /static/black-friday.js (which is untouched).
+ * The tag ID and the conversion label are read from the banner element's data-* attributes
+ * (#adsConsent[data-ads-id][data-ads-send-to]), so this file stays generic and reusable and
+ * the page holds the one copy of the config. Without those attributes the script stays inert.
  *
  * WHY A GATE: the Google Ads tag is NOT cookieless — it sets the advertising cookies
  * _gcl_au / _gcl_aw. So nothing loads and no request fires until the visitor accepts.
@@ -17,10 +20,9 @@
 (function () {
   "use strict";
 
-  var AW_ID = "AW-18065522009";
-  var SEND_TO = "AW-18065522009/vnDUCPDxt7AdENn6p6ZD";
   var STORE_KEY = "o4p_ads_consent"; // "granted" | "denied"
   var SUBMIT_FALLBACK_MS = 700;      // hard cap: submit even if the tag never answers
+  var cfg = null;                    // { id, sendTo } — read from the banner, never hard-coded
 
   /* ---- the visitor's stored choice ---- */
   function readChoice() {
@@ -61,7 +63,7 @@
 
   /* ---- the tag: loaded ONLY on consent ---- */
   function loadGtag() {
-    if (window.__o4pAdsLoaded) return;
+    if (!cfg || window.__o4pAdsLoaded) return;
     window.__o4pAdsLoaded = true;
     window.dataLayer = window.dataLayer || [];
     window.gtag =
@@ -70,10 +72,10 @@
         window.dataLayer.push(arguments);
       };
     window.gtag("js", new Date());
-    window.gtag("config", AW_ID);
+    window.gtag("config", cfg.id);
     var s = document.createElement("script");
     s.async = true;
-    s.src = "https://www.googletagmanager.com/gtag/js?id=" + AW_ID;
+    s.src = "https://www.googletagmanager.com/gtag/js?id=" + cfg.id;
     document.head.appendChild(s);
   }
 
@@ -84,8 +86,8 @@
     var action = form.getAttribute("action") || "";
     if (action.indexOf("/shop/post_basket") === -1) return;
 
-    // No consent, or no tag: do nothing, let the native POST go through untouched.
-    if (!isGranted() || typeof window.gtag !== "function") return;
+    // Not configured, no consent, or no tag: do nothing, let the native POST go through.
+    if (!cfg || !isGranted() || typeof window.gtag !== "function") return;
 
     e.preventDefault();
     var submitted = false;
@@ -96,7 +98,7 @@
     }
     try {
       window.gtag("event", "conversion", {
-        send_to: SEND_TO,
+        send_to: cfg.sendTo,
         event_callback: submitNow,
       });
     } catch (err) {
@@ -135,6 +137,12 @@
     var banner = bannerEl();
     if (!banner) return;
 
+    // Config lives in the page. Missing config -> stay inert (no tag, no conversion).
+    var id = banner.getAttribute("data-ads-id");
+    var sendTo = banner.getAttribute("data-ads-send-to");
+    if (!id || !sendTo) return;
+    cfg = { id: id, sendTo: sendTo };
+
     var choice = readChoice();
     if (choice === "granted") {
       loadGtag(); // returning visitor who already accepted: load straight away