allow to mute and unmute tabs and get mute status into tab info

extension/background.js

@@ -141,6 +141,8 @@ async function dispatch(command, args) {
     case "tabs.dedupe":       return tabsDedupe();
     case "tabs.sort":         return tabsSort(args);
     case "tabs.merge_windows": return tabsMergeWindows();
+    case "tabs.mute":         return tabsMute(args);
+    case "tabs.unmute":       return tabsUnmute(args);
 
     // ── Groups ────────────────────────────────────────────────────────────
     case "group.list":   return groupList();
@@ -439,8 +441,27 @@ async function tabsMergeWindows() {
   return { moved };
 }
 
+async function tabsMute({ tabId }) {
+  const tab = tabId ? await chrome.tabs.get(tabId) : await getActiveTab();
+  await chrome.tabs.update(tab.id, { muted: true });
+  return { tabId: tab.id, muted: true };
+}
+
+async function tabsUnmute({ tabId }) {
+  const tab = tabId ? await chrome.tabs.get(tabId) : await getActiveTab();
+  await chrome.tabs.update(tab.id, { muted: false });
+  return { tabId: tab.id, muted: false };
+}
+
 function tabInfo(t) {
-  return { id: t.id, windowId: t.windowId, active: t.active, title: t.title, url: t.url };
+  return {
+    id: t.id,
+    windowId: t.windowId,
+    active: t.active,
+    muted: Boolean(t.mutedInfo && t.mutedInfo.muted),
+    title: t.title,
+    url: t.url,
+  };
 }
 
 // ── Groups ────────────────────────────────────────────────────────────────────