feat: add advanced context actions and optional translation

background/open-chat.js

@@ -0,0 +1,9 @@
+export async function openChat(browser, url, openIn) {
+  if (openIn === 'new-window') {
+    try {
+      await browser.windows.create({ url });
+      return;
+    } catch { /* Fall back to a tab. */ }
+  }
+  await browser.tabs.create({ url, active: openIn !== 'background-tab' });
+}