chore: checkpoint current milestone work

Sources/RDReaderView/EPUBTextRendering/RDEPUBTextPaginationSupport.swift

@@ -2,24 +2,16 @@ import CoreText
 import UIKit
 
 extension NSAttributedString {
+    func rd_paginatedFrames(
+        size: CGSize,
+        fragmentOffsets: [String: Int] = [:]
+    ) -> [RDEPUBTextLayoutFrame] {
+        RDEPUBTextLayouter(attributedString: self, pageSize: size)
+            .layoutFrames(fragmentOffsets: fragmentOffsets)
+    }
+
     func ss_pageRanges(size: CGSize) -> [NSRange] {
-        var ranges: [NSRange] = []
-        let framesetter = CTFramesetterCreateWithAttributedString(self)
-        let path = CGPath(rect: CGRect(origin: .zero, size: size), transform: nil)
-        var visibleRange = CFRangeMake(0, 0)
-        var location = 0
-
-        while visibleRange.location + visibleRange.length < length {
-            let frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(location, 0), path, nil)
-            visibleRange = CTFrameGetVisibleStringRange(frame)
-            guard visibleRange.length > 0 else {
-                break
-            }
-            ranges.append(NSRange(location: location, length: visibleRange.length))
-            location += visibleRange.length
-        }
-
-        return ranges
+        rd_paginatedFrames(size: size).map(\.contentRange)
     }
 }
 
@@ -32,4 +24,4 @@ extension UIColor {
         getRed(&red, green: &green, blue: &blue, alpha: &alpha)
         return String(format: "rgba(%d, %d, %d, %.3f)", Int(red * 255), Int(green * 255), Int(blue * 255), alpha)
     }
-}
+}