test: 增强 UI 测试基础设施与阅读器自动化测试

- 新增 BookmarkTests/PageNavigationTests/TableOfContentsTests 等阅读器功能测试
- 扩展 AccessibilityIdentifiers 支持更多 UI 元素定位
- XCUIApplication+Launch: 增加启动参数支持（reset state、自定义书籍）
- ReaderAnnotationTests: 完善标注测试覆盖
- ViewController: 支持 --demo-reset-state 参数清理持久化状态
- 新增凡人修仙传测试样本

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ReadViewDemo/ReadViewDemoUITests/ReaderUITests/TableOfContentsTests.swift

@@ -0,0 +1,33 @@
+import XCTest
+
+final class TableOfContentsTests: XCTestCase {
+    private let app = XCUIApplication()
+
+    override func setUpWithError() throws {
+        continueAfterFailure = false
+    }
+
+    func testTocButtonExists() {
+        app.launchAndOpenSampleBook(bookTitleQuery: "宝山辽墓材料与释读")
+        app.waitForReader()
+        app.showReaderChromeIfNeeded()
+
+        let tocButton = app.buttons[IDs.readerToc]
+        XCTAssertTrue(tocButton.waitForExistence(timeout: 5), "目录按钮未出现")
+    }
+
+    func testTocButtonTappable() {
+        app.launchAndOpenSampleBook(bookTitleQuery: "宝山辽墓材料与释读")
+        app.waitForReader()
+        app.showReaderChromeIfNeeded()
+
+        let tocButton = app.buttons[IDs.readerToc]
+        XCTAssertTrue(tocButton.waitForExistence(timeout: 5))
+        XCTAssertTrue(tocButton.isEnabled, "目录按钮不可点击")
+        tocButton.tap()
+
+        let tocPanel = app.tables[IDs.readerTocTable]
+        XCTAssertTrue(tocPanel.waitForExistence(timeout: 5), "目录面板未出现")
+        XCTAssertTrue(app.navigationBars[IDs.readerTocNavBar].waitForExistence(timeout: 2), "目录导航栏未暴露")
+    }
+}