feat: add market row selection column

tests/market-dom-sync.test.ts

@@ -39,6 +39,9 @@ describe("market-dom-sync", () => {
     const table = syncMarketTable(document);
 
     expect(table).not.toBeNull();
+    expect(
+      document.querySelector('[data-market-header-cell="selection"]')
+    ).not.toBeNull();
     expect(
       document.querySelector('[data-market-header-cell="singleVideoAfterSearchRate"]')
     ).not.toBeNull();
@@ -63,7 +66,9 @@ describe("market-dom-sync", () => {
     expect(
       document.querySelector('[data-market-header-cell="cpSearch"]')
     ).not.toBeNull();
-    expect(document.querySelectorAll("[data-market-row-cell]").length).toBe(16);
+    expect(document.querySelectorAll("[data-market-row-cell]").length).toBe(18);
+    expect(table?.headerSelectionCheckbox).not.toBeNull();
+    expect(table?.rows[0]?.selectionCheckbox).not.toBeNull();
   });
 
   test("renders loading, success, missing, and failed states", () => {
@@ -170,7 +175,11 @@ describe("market-dom-sync", () => {
       throw new Error("Expected market table");
     }
 
+    expect(table.headerSelectionCheckbox).not.toBeNull();
+    expect(table.rows[0]?.selectionCheckbox).not.toBeNull();
     expect(readRightHeaderTexts()).toEqual(["21-60s报价", "操作"]);
+    expect(readSelectionHeaderText()).toBe("全选");
+    expect(readSelectionRowCheckboxCount()).toBe(2);
     expect(readPluginHeaderTexts()).toEqual([
       "单视频看后搜率",
       "个人视频看后搜率",
@@ -926,6 +935,18 @@ function readScrollHintText() {
   );
 }
 
+function readSelectionHeaderText() {
+  return (
+    document
+      .querySelector('[data-market-header-cell="selection"]')
+      ?.textContent?.trim() ?? ""
+  );
+}
+
+function readSelectionRowCheckboxCount() {
+  return document.querySelectorAll('[data-market-selection-checkbox="row"]').length;
+}
+
 function readAuthorNames() {
   const authorColumn = document.querySelector(
     '[data-testid="author-section"] .content-column'