feat: 设置面板与章节运行时联动优化

- 设置页打开时仅重新计算当前章节预览，关闭后触发完整补全
- 新增 preview 加载优先级，支持设置页内当前章预览
- 添加设置页防抖机制，合并连续字号/行距变更
- 支持下滑手势关闭设置页，通过 presentation delegate 通知运行时
- 重新分页时跳过导航和尺寸校验，避免状态冲突
- currentTextPageSize 线程安全优化，后台线程使用缓存尺寸
- 更新 CocoaPods 依赖

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

Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBReaderChromeCoordinator.swift

@@ -8,7 +8,7 @@ import UIKit
 /// - 同步工具栏的主题和状态
 /// - 弹出设置面板和目录面板
 /// - 处理返回按钮的关闭逻辑
-final class RDEPUBReaderChromeCoordinator {
+final class RDEPUBReaderChromeCoordinator: NSObject, UIAdaptivePresentationControllerDelegate {
     private unowned let context: RDEPUBReaderContext
 
     init(context: RDEPUBReaderContext) {
@@ -19,6 +19,13 @@ final class RDEPUBReaderChromeCoordinator {
         context.controller
     }
 
+    // MARK: - UIAdaptivePresentationControllerDelegate
+
+    func presentationControllerDidDismiss(_ presentationController: UIPresentationController) {
+        // 设置页面被用户下滑关闭时
+        context.runtime?.settingsPanelDidDisappear()
+    }
+
     /// 创建顶部工具栏视图，绑定返回、搜索和书签切换回调。
     func makeTopToolView() -> RDEPUBReaderTopToolView {
         let toolView = RDEPUBReaderTopToolView()
@@ -110,6 +117,10 @@ final class RDEPUBReaderChromeCoordinator {
     func presentSettings() {
         guard let controller else { return }
         guard controller.configuration.showsSettingsPanel else { return }
+
+        // 通知 Runtime 设置页面即将打开
+        context.runtime?.settingsPanelWillAppear()
+
         let settingsController = RDEPUBReaderSettingsViewController(
             configuration: controller.configuration,
             brightness: controller.currentBrightness
@@ -135,9 +146,14 @@ final class RDEPUBReaderChromeCoordinator {
         settingsController.onThemeChange = { [weak controller] theme in
             controller?.updateConfiguration { $0.theme = theme }
         }
+        settingsController.onDismiss = { [weak self] in
+            // 通知 Runtime 设置页面已关闭
+            self?.context.runtime?.settingsPanelDidDisappear()
+        }
 
         let navigationController = UINavigationController(rootViewController: settingsController)
         navigationController.modalPresentationStyle = .pageSheet
+        navigationController.presentationController?.delegate = self
         controller.present(navigationController, animated: true)
     }