Enhance visit filtering and batching for remote data submission

extension/service-worker.js

@@ -24,16 +24,38 @@ async function archiveLocally(visits) {
 async function sendToCollector(visits) {
   // Empty settings deliberately disable sending; the local SQLite archive still works.
   if (!CONFIG.collectorUrl || !CONFIG.apiToken) return true;
+  const remoteVisits = visits
+    .filter((visit) => {
+      if (typeof visit?.url !== "string") return false;
       try {
+        const protocol = new URL(visit.url).protocol;
+        return protocol === "http:" || protocol === "https:";
+      } catch {
+        return false;
+      }
+    })
+    .map((visit) => ({
+      ...visit,
+      title: String(visit.title ?? "").slice(0, 1000)
+    }));
+  try {
+    for (let offset = 0; offset < remoteVisits.length; offset += 100) {
       const response = await fetch(CONFIG.collectorUrl, {
         method: "POST",
         headers: {
           "Content-Type": "application/json",
           "Authorization": `Bearer ${CONFIG.apiToken}`
         },
-      body: JSON.stringify({ device_id: CONFIG.deviceId, visits })
+        body: JSON.stringify({
+          device_id: CONFIG.deviceId,
+          visits: remoteVisits.slice(offset, offset + 100)
+        })
       });
-    if (!response.ok) throw new Error(`HTTP ${response.status}`);
+      if (!response.ok) {
+        const detail = (await response.text()).trim().slice(0, 1000);
+        throw new Error(`HTTP ${response.status}${detail ? `: ${detail}` : ""}`);
+      }
+    }
     return true;
   } catch (error) {
     console.warn("Collector unavailable", error.message);