feat(userscript): drain the retry queue on navigate and on reconnect

userscript/manga-bookmark.user.js

@@ -440,6 +440,31 @@
     saveQueue(queue);
   }
 
+  let draining = false;
+
+  // Replays everything owed. Cheap in the normal case — it returns on the first
+  // line when the queue is empty, which is why it can hang off navigation. A
+  // 401 stops the whole pass: the token is wrong, so the next entry would fail
+  // the same way, and the queue is left intact so fixing the token fixes it.
+  async function drain() {
+    if (draining || queue.length === 0) return;
+    draining = true;
+    authFailed = false;
+    try {
+      for (const e of queue.slice()) {
+        if (e.op === "delete") await pushDelete(e.key);
+        else await pushBookmark(e.key, e.sendStatus);
+        if (authFailed) {
+          toast("Sync auth failed — check the token", true);
+          break;
+        }
+      }
+    } finally {
+      draining = false;
+    }
+    render();
+  }
+
   // ============================================================
   // Mutations (optimistic: update UI/cache first, then sync)
   // ============================================================
@@ -1018,6 +1043,9 @@
     // Asura is client-routed, so full loads are rare — checking here too is
     // what keeps its bookmarks current. The throttle still caps the rate.
     backgroundRefreshLatest();
+    // Drain only, not a full refresh: Asura may go a long time without a
+    // reload, and an extra GET per client-side route change is not wanted.
+    drain();
   }
 
   // Framework-agnostic URL-change watcher: patch history + poll as a fallback,
@@ -1053,6 +1081,7 @@
     state.page = detect();
     render();
     installNavWatcher();
+    window.addEventListener("online", drain); // signal returned while the page stayed open
     // Sync first: both auto-record and the latest-chapter checks below need to
     // know which series are bookmarked and how fresh they are.
     refresh().then(() => {