抽取cookie清理逻辑为新的第六步

background/steps/clear-login-cookies.js

@@ -0,0 +1,19 @@
+(function attachBackgroundStep6(root, factory) {
+  root.MultiPageBackgroundStep6 = factory();
+})(typeof self !== 'undefined' ? self : globalThis, function createBackgroundStep6Module() {
+  function createStep6Executor(deps = {}) {
+    const {
+      completeStepFromBackground,
+      runPreStep6CookieCleanup,
+    } = deps;
+
+    async function executeStep6() {
+      await runPreStep6CookieCleanup();
+      await completeStepFromBackground(6);
+    }
+
+    return { executeStep6 };
+  }
+
+  return { createStep6Executor };
+});