feat: city guide on city pages (tagline, facts, About, seasons)

Editable per city under Viator tours > Destinations. Shown above the
tours on page 1 of an unfiltered listing only; filtering and paging jump
to the results. Text recovered from the six old /tour-destination/ pages
is imported once into empty guides.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

viator-collector/assets/js/vc-design.js

@@ -86,6 +86,22 @@
     });
   });
 
+  /* ---------- city guide: long About text folds behind "Read more" ---------- */
+  Array.prototype.forEach.call(app.querySelectorAll("[data-vc-clamp]"), function (text) {
+    var btn = text.nextElementSibling;
+    text.classList.add("is-clamped");
+    if (!btn || text.scrollHeight <= text.clientHeight + 8) {
+      text.classList.remove("is-clamped");
+      return;
+    }
+    btn.hidden = false;
+    btn.addEventListener("click", function () {
+      var open = text.classList.toggle("is-clamped") === false;
+      btn.setAttribute("aria-expanded", open ? "true" : "false");
+      btn.querySelector("span").textContent = open ? "Read less" : "Read more";
+    });
+  });
+
   /* ---------- single tour: "view all photos" scrolls the gallery ---------- */
   var viewAll = app.querySelector(".tg-viewall, .gallery__viewall");
   if (viewAll) viewAll.addEventListener("click", function () {