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/Helpers/XCUIApplication+Launch.swift

@@ -1,8 +1,16 @@
 import XCTest
 
 extension XCUIApplication {
-    func launchAndOpenSampleBook(displayType: String? = nil, pageNumber: Int? = nil) {
-        var args = ["--demo-book-title", "回归验证样本"]
+    func launchAndOpenSampleBook(
+        bookTitleQuery: String = "回归验证样本",
+        displayType: String? = nil,
+        pageNumber: Int? = nil,
+        resetsReaderState: Bool = true
+    ) {
+        var args = ["--demo-book-title", bookTitleQuery]
+        if resetsReaderState {
+            args.append("--demo-reset-state")
+        }
         if let displayType {
             args += ["--demo-display-type", displayType]
         }
@@ -21,6 +29,10 @@ extension XCUIApplication {
         return state
     }
 
+    func waitForReaderPage(_ pageNumber: Int, timeout: TimeInterval = 12) {
+        waitForReaderState(containing: "page=\(pageNumber)", timeout: timeout)
+    }
+
     func showReaderChromeIfNeeded() {
         if buttons[IDs.readerBack].exists && buttons[IDs.readerSettings].exists {
             return
@@ -34,18 +46,33 @@ extension XCUIApplication {
         }
     }
 
+    func hideReaderChromeIfNeeded() {
+        for _ in 0..<3 {
+            guard buttons[IDs.readerBack].exists else { return }
+
+            let content = otherElements[IDs.readerContent]
+            if content.waitForExistence(timeout: 2) {
+                content.coordinate(withNormalizedOffset: CGVector(dx: 0.5, dy: 0.6)).tap()
+            }
+            RunLoop.current.run(until: Date().addingTimeInterval(0.5))
+        }
+    }
+
     func waitForReaderState(containing expectedText: String, timeout: TimeInterval = 8) {
         let state = staticTexts[IDs.demoReaderState]
         let deadline = Date().addingTimeInterval(timeout)
+        var lastLabel = "<missing>"
 
         while Date() < deadline {
-            if state.exists && state.label.contains(expectedText) {
-                return
+            if state.exists {
+                lastLabel = state.label
+                if lastLabel.contains(expectedText) {
+                    return
+                }
             }
             RunLoop.current.run(until: Date().addingTimeInterval(0.1))
         }
 
-        let currentLabel = state.exists ? state.label : "<missing>"
-        XCTFail("阅读器状态未包含 \(expectedText)，当前：\(currentLabel)")
+        XCTFail("阅读器状态未包含 \(expectedText)，当前：\(lastLabel)")
     }
 }