Add manual channel marker feature on YouTube home page

js&css/extension/init.js

@@ -52,6 +52,8 @@ extension.events.on('init', function () {
 	extension.features.openNewTab();
 	extension.features.removeListParamOnNewTab();
 	extension.features.removeMemberOnly();
+	extension.features.channelMarker();
+
 	// extension.features.hideSponsoredVideosOnHome?.();	
 	bodyReady();
 });

js&css/extension/www.youtube.com/channel-marker.js

@@ -0,0 +1,60 @@
+console.log("YT Sub Highlight running");
+
+// Load saved channels
+const savedChannels = new Set(
+  JSON.parse(localStorage.getItem("yt-marked-channels") || "[]")
+);
+
+function saveChannels() {
+  localStorage.setItem(
+    "yt-marked-channels",
+    JSON.stringify([...savedChannels])
+  );
+}
+
+function enhanceChannel(link) {
+  if (link.dataset.enhanced) return;
+  link.dataset.enhanced = "true";
+
+  const channelUrl = link.href;
+
+  const star = document.createElement("span");
+  star.textContent = savedChannels.has(channelUrl) ? " ⭐" : " ☆";
+  star.style.cursor = "pointer";
+  star.style.marginLeft = "6px";
+  star.style.fontSize = "14px";
+  star.title = "Click to mark this channel";
+
+  // ✅ FIX: stop navigation when clicking star
+  star.addEventListener("click", (event) => {
+    event.preventDefault();    // stops link navigation
+    event.stopPropagation();   // stops event bubbling
+
+    if (savedChannels.has(channelUrl)) {
+      savedChannels.delete(channelUrl);
+      star.textContent = " ☆";
+    } else {
+      savedChannels.add(channelUrl);
+      star.textContent = " ⭐";
+    }
+
+    saveChannels();
+  });
+
+  link.appendChild(star);
+}
+
+function scanChannels() {
+  document
+    .querySelectorAll('a[href^="/@"]')
+    .forEach(enhanceChannel);
+}
+
+// Initial run
+scanChannels();
+
+// Handle infinite scroll
+new MutationObserver(scanChannels).observe(document.body, {
+  childList: true,
+  subtree: true
+});