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/RDEPUBReaderController+DataSource.swift

@@ -295,6 +295,9 @@ extension RDEPUBReaderController: RDReaderDataSource, RDReaderDelegate {
         updateCurrentSelection(nil)
         reconcileTextPaginationSizeIfNeeded(for: pageNum)
 
+        // 如果正在重新分页，跳过后续操作，避免状态冲突
+        guard !isRepaginating else { return }
+
         // 用户开始导航时，应用后台解析完成的完整 map
         let previousCurrentPage = readerView.currentPage
         runtime.applyPendingFullPageMapIfNeeded()
@@ -362,10 +365,17 @@ extension RDEPUBReaderController: RDReaderDataSource, RDReaderDelegate {
         }
 
         isReconcilingTextPaginationSize = true
-        DispatchQueue.main.async { [weak self] in
+        // 使用防抖延迟，避免连续快速点击字号时重复触发
+        DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) { [weak self] in
             guard let self else { return }
             self.isReconcilingTextPaginationSize = false
             guard (self.textBook != nil || self.readerContext.bookPageMap != nil), !self.isRepaginating else { return }
+            // 再次检查尺寸是否仍然变化，避免过期的重新分页
+            let currentSize = self.readerView.resolvedSinglePageSize(pageNum: self.readerView.currentPage)
+            guard currentSize.width > 0, currentSize.height > 0 else { return }
+            let stillChanged = abs(currentSize.width - self.lastTextPaginationPageSize!.width) > 0.5
+                || abs(currentSize.height - self.lastTextPaginationPageSize!.height) > 0.5
+            guard stillChanged else { return }
             self.repaginatePreservingCurrentLocation()
         }
     }