feat: EPUB 阅读器搜索、选中注释、书签 chrome 状态及大量重构优化

- 新增 RDEPUBReaderSearchCoordinator 与 RDEPUBSelectionState 管理搜索和选中状态
- 新增 BookmarkChromeStateTests、NavigationBackwardTests、SelectionAnnotateTests 等 UI 测试
- 新增多个边界测试 epub 样本（损坏结构、空归档、缺失文件、流式外链验证）
- 重构阅读器 chrome 状态管理，统一 tool bar 与 search bar 交互
- 优化大书分页缓存策略（RDEPUBChapterSummaryDiskCache、RDEPUBPageCountCache）
- 移除废弃的 RDEPUBLocationConverter 和 RDEPUBPageBreakPolicy
- 更新 epub-bridge.js 与 JS bridge 通信协议
- 全面更新现有 UI 测试以适配新的 helper 和状态管理

ReadViewDemo/ReadViewDemoUITests/ReaderUITests/ErrorAndEdgeCaseTests.swift

@@ -14,7 +14,7 @@ final class ErrorAndEdgeCaseTests: XCTestCase {
         let paging = app.collectionViews[IDs.readerPaging]
         if paging.waitForExistence(timeout: 5) { paging.swipeUp() }
 
-        app.waitForReaderState(containing: "reader=opened", timeout: 5)
+        app.waitForDemoReaderState(timeout: 5, description: "reader=opened") { $0.isOpened }
     }
 
     func testOpenAndCloseMultipleTimes() throws {
@@ -42,7 +42,7 @@ final class ErrorAndEdgeCaseTests: XCTestCase {
 
         for _ in 1...5 { paging.swipeLeft() }
 
-        app.waitForReaderState(containing: "reader=opened", timeout: 8)
+        app.waitForDemoReaderState(timeout: 8, description: "reader=opened") { $0.isOpened }
     }
 
     func testSettingsPanelScrollReachesAllControls() throws {
@@ -66,4 +66,85 @@ final class ErrorAndEdgeCaseTests: XCTestCase {
 
         app.buttons[IDs.settingsDone].tap()
     }
-}
+
+    func testHTTPSExternalLinkShowsConfirmationAlert() throws {
+        app.launchAndOpenSampleBook(bookTitleQuery: "Web交互流式外链验证", displayType: "scroll")
+        app.waitForReader(timeout: 20)
+
+        let httpsLink = externalLinkElement(named: "HTTPS Link")
+        guard httpsLink.waitForExistence(timeout: 8) else {
+            throw XCTSkip("HTTPS 外链元素未暴露")
+        }
+        httpsLink.tap()
+
+        XCTAssertTrue(app.alerts["打开外部链接"].waitForExistence(timeout: 5), "HTTPS 外链应弹出确认框")
+        XCTAssertTrue(app.buttons["打开"].waitForExistence(timeout: 2), "确认框应提供打开按钮")
+        app.buttons["取消"].tap()
+    }
+
+    func testMailtoExternalLinkBlockedByDefaultPolicy() throws {
+        app.launchAndOpenSampleBook(bookTitleQuery: "Web交互流式外链验证", displayType: "scroll")
+        app.waitForReader(timeout: 20)
+
+        let mailtoLink = externalLinkElement(named: "Mailto Link")
+        guard mailtoLink.waitForExistence(timeout: 8) else {
+            throw XCTSkip("Mailto 外链元素未暴露")
+        }
+        mailtoLink.tap()
+
+        XCTAssertFalse(app.alerts["打开外部链接"].waitForExistence(timeout: 2), "默认策略下 mailto 不应弹出确认框")
+        let state = app.waitForDemoReaderState(timeout: 5, description: "mailto activation recorded") { state in
+            (state.externalLinks ?? 0) >= 1 && state.lastExternalURL != nil
+        }
+        XCTAssertTrue(state.lastExternalURL?.contains("mailto:test@example.com") == true, "应记录 mailto 激活但不继续打开")
+    }
+
+    func testLargeWebResourceUsesStreamingPath() throws {
+        app.launchAndOpenSampleBook(bookTitleQuery: "Web交互流式外链验证", displayType: "scroll")
+        app.waitForReader(timeout: 20)
+
+        let state = app.waitForDemoReaderState(timeout: 15, description: "streamedResources>0") { state in
+            (state.streamedResources ?? 0) > 0
+        }
+        XCTAssertGreaterThan(state.streamedResources ?? 0, 0, "大资源应走流式传输路径")
+    }
+
+    func testInvalidEPUBReportsFailure() {
+        app.launchAndOpenSampleBook(bookTitleQuery: "损坏结构样本", resetsReaderState: true)
+
+        let state = app.waitForDemoReaderState(timeout: 12, description: "invalid epub failure") { state in
+            state.lastError != nil && state.lastError != "none"
+        }
+        XCTAssertNotEqual(state.lastError, "none")
+    }
+
+    func testEmptyArchiveReportsFailure() {
+        app.launchAndOpenSampleBook(bookTitleQuery: "空归档样本", resetsReaderState: true)
+
+        let state = app.waitForDemoReaderState(timeout: 12, description: "empty archive failure") { state in
+            state.lastError != nil && state.lastError != "none"
+        }
+        XCTAssertNotEqual(state.lastError, "none")
+    }
+
+    func testMissingSpineDocumentReportsFailure() {
+        app.launchAndOpenSampleBook(bookTitleQuery: "缺失文件样本", resetsReaderState: true)
+
+        let state = app.waitForDemoReaderState(timeout: 12, description: "missing file failure") { state in
+            state.lastError != nil && state.lastError != "none"
+        }
+        XCTAssertNotEqual(state.lastError, "none")
+    }
+
+    private func externalLinkElement(named label: String) -> XCUIElement {
+        let link = app.links[label]
+        if link.exists {
+            return link
+        }
+        let staticText = app.staticTexts[label]
+        if staticText.exists {
+            return staticText
+        }
+        return link
+    }
+}