feat: add advanced context actions and optional translation

test/open-chat.test.js

@@ -0,0 +1,14 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+const { openChat } = await import('../background/open-chat.js').catch(()=>({}));
+test('window failure falls back to tab, background mode stays inactive, final failure rejects', async()=>{
+  assert.equal(typeof openChat,'function');
+  const opened=[];
+  const browser={windows:{create:async()=>{throw Error('window failed');}},tabs:{create:async v=>opened.push(v)}};
+  await openChat(browser,'https://chatgpt.com/','new-window');
+  assert.deepEqual(opened,[{url:'https://chatgpt.com/',active:true}]);
+  await openChat(browser,'https://chatgpt.com/','background-tab');
+  assert.equal(opened[1].active,false);
+  browser.tabs.create=async()=>{throw Error('tab failed');};
+  await assert.rejects(openChat(browser,'https://chatgpt.com/','new-window'));
+});