feat(epub): align wxread css and overlay pagination behavior

Sources/RDReaderView/EPUBUI/RDEPUBReaderController.swift

@@ -679,8 +679,9 @@ public final class RDEPUBReaderController: UIViewController {
 
         if publication.readingProfile == .textReflowable {
             let renderer = resolvedTextRenderer()
-            let builder = RDEPUBTextBookBuilder(renderer: renderer, cache: textBookCache)
             let pageSize = currentTextPageSize()
+            let layoutConfig = currentTextLayoutConfig(pageSize: pageSize)
+            let builder = RDEPUBTextBookBuilder(renderer: renderer, cache: textBookCache, layoutConfig: layoutConfig)
             let renderStyle = currentTextRenderStyle()
 
             DispatchQueue.global(qos: .userInitiated).async { [weak self] in
@@ -913,7 +914,7 @@ public final class RDEPUBReaderController: UIViewController {
         let restoreLocation = currentVisibleLocation() ?? persistenceLocation()
         let pageSize = currentTextPageSize()
         let style = currentTextRenderStyle()
-        let builder = RDPlainTextBookBuilder()
+        let builder = RDPlainTextBookBuilder(layoutConfig: currentTextLayoutConfig(pageSize: pageSize))
         if let newBook = try? builder.build(textFileURL: textFileURL, pageSize: pageSize, style: style) {
             applyTextBook(newBook, restoreLocation: restoreLocation)
         }
@@ -1231,6 +1232,26 @@ public final class RDEPUBReaderController: UIViewController {
         )
     }
 
+    private func currentTextLayoutConfig(pageSize: CGSize) -> RDEPUBTextLayoutConfig {
+        let viewportSize = currentLayoutContext().viewportSize
+        let derivedFrameSize = CGSize(
+            width: max(viewportSize.width, pageSize.width),
+            height: max(viewportSize.height, pageSize.height)
+        )
+        return RDEPUBTextLayoutConfig(
+            frameWidth: derivedFrameSize.width,
+            frameHeight: derivedFrameSize.height,
+            edgeInsets: .zero,
+            numberOfColumns: 1,
+            columnGap: 20,
+            avoidOrphans: true,
+            avoidWidows: true,
+            avoidPageBreakInsideEnabled: true,
+            hyphenation: true,
+            imageMaxHeightRatio: 0.85
+        )
+    }
+
     private func resolvedTextRenderer() -> RDEPUBTextRenderer {
         RDEPUBDTCoreTextRenderer()
     }