feat: EPUB阅读器搜索、注释、CFI模块及大书远距跳转优化

- 实现EPUB阅读器搜索功能及选中注释功能
- 优化CFI模块，修复代码审查发现的11个问题
- 实现大书远距目录跳转与后台补全优化方案
- 优化设置面板与章节运行时联动
- 重构及大量改进优化

Sources/RDReaderView/EPUBTextRendering/BuildPipeline/RDEPUBChapterTailNormalizer.swift

@@ -1,12 +1,13 @@
 import Foundation
 
-/// Normalizes suspicious trailing or whitespace-only page frames after pagination.
 struct RDEPUBChapterTailNormalizer {
+
     func normalize(
         _ frames: [RDEPUBTextLayoutFrame],
         content: NSAttributedString,
         href: String
     ) -> [RDEPUBTextLayoutFrame] {
+
         guard frames.count > 1 else { return frames }
 
         var normalized = frames
@@ -16,10 +17,12 @@ struct RDEPUBChapterTailNormalizer {
         for frame in normalized {
             if shouldDropWhitespaceOnlyFrame(frame, in: content) {
                 let note = "normalized: dropped whitespace-only intermediate page \(NSStringFromRange(frame.contentRange))"
+
                 if var previous = compacted.popLast() {
                     previous.diagnostics.append(note)
                     compacted.append(previous)
                 } else {
+
                     #if DEBUG
                     print("[EPUB][Pagination] href=\(href) dropped leading/intermediate whitespace frame \(NSStringFromRange(frame.contentRange))")
                     #endif
@@ -73,6 +76,7 @@ struct RDEPUBChapterTailNormalizer {
         previousFrame: RDEPUBTextLayoutFrame,
         in content: NSAttributedString
     ) -> Bool {
+
         guard trailingFrame.contentRange.length > 0,
               NSMaxRange(previousFrame.contentRange) == trailingFrame.contentRange.location else {
             return false
@@ -80,6 +84,7 @@ struct RDEPUBChapterTailNormalizer {
 
         let visibleCount = visibleCharacterCount(in: content, range: trailingFrame.contentRange)
         let trailingAttachmentCount = attachmentCount(in: content, range: trailingFrame.contentRange)
+
         guard visibleCount <= 2,
               trailingFrame.contentRange.length <= 2,
               visibleCount > 0 || trailingAttachmentCount > 0 else {
@@ -94,6 +99,7 @@ struct RDEPUBChapterTailNormalizer {
         _ previousFrame: RDEPUBTextLayoutFrame,
         with trailingFrame: RDEPUBTextLayoutFrame
     ) -> RDEPUBTextLayoutFrame {
+
         let mergedRange = NSRange(
             location: previousFrame.contentRange.location,
             length: NSMaxRange(trailingFrame.contentRange) - previousFrame.contentRange.location
@@ -109,6 +115,7 @@ struct RDEPUBChapterTailNormalizer {
             semanticHints: uniqueValues(from: previousFrame.semanticHints + trailingFrame.semanticHints),
             attachmentPlacements: uniqueValues(from: previousFrame.attachmentPlacements + trailingFrame.attachmentPlacements),
             trailingFragmentID: trailingFrame.trailingFragmentID ?? previousFrame.trailingFragmentID,
+
             diagnostics: previousFrame.diagnostics
                 + trailingFrame.diagnostics
                 + ["normalized: merged short trailing page \(NSStringFromRange(trailingFrame.contentRange)) into previous page"]
@@ -121,6 +128,7 @@ struct RDEPUBChapterTailNormalizer {
     ) -> Int {
         guard range.length > 0 else { return 0 }
         let string = content.attributedSubstring(from: range).string
+
         let filteredScalars = string.unicodeScalars.filter { scalar in
             !CharacterSet.whitespacesAndNewlines.contains(scalar)
                 && !CharacterSet.controlCharacters.contains(scalar)