refactor(userscript): thread seriesId through latest-chapter scan

userscript/manga-bookmark.user.js

@@ -311,9 +311,11 @@
   }
 
   // Highest chapter the site lists, or null when the markup yields nothing.
-  function computeLatestChapter(site, anchors) {
+  // seriesId is only consulted by adapters whose pages carry other series'
+  // chapter links; the rest ignore it.
+  function computeLatestChapter(site, anchors, seriesId) {
     const a = adapterFor(site);
-    return a ? a.latestChapterFromAnchors(anchors) : null;
+    return a ? a.latestChapterFromAnchors(anchors, seriesId) : null;
   }
 
   function currentSite() {
@@ -834,7 +836,7 @@
     if (!existing) return;
     applyLatestChapterIfChanged(
       existing,
-      computeLatestChapter(p.site, anchorsFromDocument(document))
+      computeLatestChapter(p.site, anchorsFromDocument(document), p.seriesId)
     );
   }
 
@@ -864,7 +866,7 @@
         const res = await fetch(bm.series_url, { credentials: "same-origin" });
         if (!res.ok) continue;
         const html = await res.text();
-        const latest = computeLatestChapter(bm.site, anchorsFromHTML(html));
+        const latest = computeLatestChapter(bm.site, anchorsFromHTML(html), bm.series_id);
         await applyLatestChapterIfChanged(state.byKey[bm.key] || bm, latest);
       } catch (e) {
         /* offline or blocked — try again after the throttle window */