feat(userscript): refresh kagane latest chapters through its API

userscript/manga-bookmark.user.js

@@ -919,10 +919,11 @@
     );
   }
 
-  // Everything else is only learned by fetching a series page. Same-origin
-  // only: these requests carry the session that gets us past the site's bot
-  // checks, which a request to the other site (or from a server) would not.
-  // One series per navigation keeps it indistinguishable from browsing.
+  // Everything else is only learned by fetching a series page — or, where the
+  // site offers one, its JSON API. Same-origin only: these requests carry the
+  // session that gets us past the site's bot checks, which a request to the
+  // other site (or from a server) would not. A few series per navigation keeps
+  // it indistinguishable from browsing.
   async function backgroundRefreshLatest() {
     const site = currentSite();
     if (!site) return;
@@ -937,15 +938,21 @@
       .slice(0, LATEST_CHECK_BATCH);
     if (due.length === 0) return;
 
+    const adapter = adapterFor(site);
     for (const bm of due) {
       // Recorded even when the fetch fails, so a broken series is retried on
       // the next throttle window rather than on every single page load.
       checked[bm.key] = Date.now();
       try {
-        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), bm.series_id);
+        let latest;
+        if (adapter && adapter.latestChapterFromApi) {
+          latest = await adapter.latestChapterFromApi(bm.series_id);
+        } else {
+          const res = await fetch(bm.series_url, { credentials: "same-origin" });
+          if (!res.ok) continue;
+          const html = await res.text();
+          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 */