fix: harden favorites controller lifecycle

tests/favorite-row-picker.test.ts

@@ -2,7 +2,10 @@
 
 import { beforeEach, describe, expect, test, vi } from "vitest";
 
-import { syncFavoriteRowPickers } from "../src/content/market/favorite-row-picker";
+import {
+  disposeFavoriteRowPickers,
+  syncFavoriteRowPickers
+} from "../src/content/market/favorite-row-picker";
 import type { FavoriteCreatorInput, FavoriteFolder } from "../src/content/market/favorites-store";
 
 const firstFolder = createFolder("folder-1", "合作");
@@ -129,6 +132,7 @@ async function flushAsyncEvents(): Promise<void> {
 
 describe("favorite-row-picker", () => {
   beforeEach(() => {
+    disposeFavoriteRowPickers(document);
     document.body.innerHTML = "";
   });
 
@@ -355,6 +359,26 @@ describe("favorite-row-picker", () => {
     expect(readPopover()).toBeNull();
   });
 
+  test("disposes an open picker and clears its detached action handler", () => {
+    const actionCell = createActionCell();
+    const onSetCreatorFolderIds = vi.fn(async () => {});
+
+    sync({ actionCell, onSetCreatorFolderIds });
+    const button = readFavoriteButton(actionCell);
+    button.click();
+    expect(readPopover()).not.toBeNull();
+
+    disposeFavoriteRowPickers(document);
+    disposeFavoriteRowPickers(document);
+
+    expect(readPopover()).toBeNull();
+    expect(button.onclick).toBeNull();
+    document.dispatchEvent(new KeyboardEvent("keydown", { key: "Escape" }));
+    document.body.dispatchEvent(new Event("pointerdown", { bubbles: true }));
+    button.click();
+    expect(onSetCreatorFolderIds).not.toHaveBeenCalled();
+  });
+
   test("clamps a bottom-right picker within the viewport", () => {
     const actionCell = createActionCell();
     const originalWidth = Object.getOwnPropertyDescriptor(