fix(agent-browser): preserve preview injection origin

tests/unit/agent-browser-core.test.ts

@@ -609,6 +609,33 @@ describe('AgentBrowserModule', () => {
     expect(externalGlobal.__MAKELORE_DATA__).toBeUndefined();
   });
 
+  it('uses the target Origin when the prime navigation reports about:blank', async () => {
+    const adapter = new FakeAdapter();
+    const preview = new FakePreviewDataSession();
+    adapter.onCreate = (view) => {
+      view.webContents.loadHandler = async (url) => {
+        view.webContents.emit('did-navigate', {}, url);
+      };
+      view.webContents.debugger.responders.set('Page.addScriptToEvaluateOnNewDocument', async () => ({
+        identifier: 'script-root',
+      }));
+    };
+    const module = new AgentBrowserModule(adapter, { previewDataSession: preview });
+
+    await module.open({
+      projectId: 'clock',
+      projectPath,
+      url: 'http://127.0.0.1:4173/',
+      injectProjectData: true,
+    });
+
+    expect(preview.opens).toEqual([{
+      projectPath,
+      origin: 'http://127.0.0.1:4173',
+      browserGeneration: 1,
+    }]);
+  });
+
   it('fails and tears down before target load when preview session setup fails', async () => {
     const adapter = new FakeAdapter();
     const preview = new FakePreviewDataSession();