feat: EPUB 阅读器搜索、选中注释、书签 chrome 状态及大量重构优化

- 新增 RDEPUBReaderSearchCoordinator 与 RDEPUBSelectionState 管理搜索和选中状态
- 新增 BookmarkChromeStateTests、NavigationBackwardTests、SelectionAnnotateTests 等 UI 测试
- 新增多个边界测试 epub 样本（损坏结构、空归档、缺失文件、流式外链验证）
- 重构阅读器 chrome 状态管理，统一 tool bar 与 search bar 交互
- 优化大书分页缓存策略（RDEPUBChapterSummaryDiskCache、RDEPUBPageCountCache）
- 移除废弃的 RDEPUBLocationConverter 和 RDEPUBPageBreakPolicy
- 更新 epub-bridge.js 与 JS bridge 通信协议
- 全面更新现有 UI 测试以适配新的 helper 和状态管理

Sources/RDReaderView/EPUBUI/TextPage/RDEPUBTextAnnotationOverlay.swift

@@ -2,6 +2,9 @@ import UIKit
 
 /// 原生文本渲染路径的批注覆盖层，负责绘制用户高亮、搜索命中高亮和当前选区装饰。
 final class RDEPUBTextAnnotationOverlay: RDEPUBSelectionOverlayView {
+    private let normalSearchColor = UIColor(red: 0.21, green: 0.48, blue: 0.95, alpha: 0.16)
+    private let activeSearchColor = UIColor(red: 0.14, green: 0.42, blue: 0.95, alpha: 0.34)
+
     /// 将用户高亮批注以富文本属性形式应用到页面内容上
     /// - Parameters:
     ///   - highlights: 高亮批注数组
@@ -58,8 +61,6 @@ final class RDEPUBTextAnnotationOverlay: RDEPUBSelectionOverlayView {
     ) {
         guard let searchState else { return }
 
-        let normalColor = UIColor(red: 248 / 255, green: 225 / 255, blue: 108 / 255, alpha: 0.55)
-        let activeColor = UIColor(red: 255 / 255, green: 159 / 255, blue: 67 / 255, alpha: 0.75)
         let pageRange = absoluteOffsetRange(for: page)
         let pageStart = pageRange.lowerBound
         let pageEndExclusive = pageRange.upperBound
@@ -72,7 +73,7 @@ final class RDEPUBTextAnnotationOverlay: RDEPUBSelectionOverlayView {
             guard overlapStart < overlapEnd else { continue }
 
             let relativeRange = NSRange(location: Int(overlapStart - contentBaseOffset), length: Int(overlapEnd - overlapStart))
-            let color = match == searchState.currentMatch ? activeColor : normalColor
+            let color = match == searchState.currentMatch ? activeSearchColor : normalSearchColor
             content.addAttribute(.backgroundColor, value: color, range: relativeRange)
         }
     }
@@ -97,9 +98,6 @@ final class RDEPUBTextAnnotationOverlay: RDEPUBSelectionOverlayView {
         let pageEndExclusive = pageRange.upperBound
 
         if let searchState {
-            let normalColor = UIColor(red: 248 / 255, green: 225 / 255, blue: 108 / 255, alpha: 0.55)
-            let activeColor = UIColor(red: 255 / 255, green: 159 / 255, blue: 67 / 255, alpha: 0.75)
-
             for match in searchState.matches {
                 guard let matchStart = match.rangeLocation else { continue }
                 let matchEnd = matchStart + match.rangeLength
@@ -113,7 +111,7 @@ final class RDEPUBTextAnnotationOverlay: RDEPUBSelectionOverlayView {
 
                 let isActive = match == searchState.currentMatch
                 let kind: RDEPUBTextOverlayDecoration.Kind = isActive ? .activeSearch : .search
-                let color = isActive ? activeColor : normalColor
+                let color = isActive ? activeSearchColor : normalSearchColor
                 background.append(RDEPUBTextOverlayDecoration(kind: kind, absoluteRange: absoluteRange, rects: rects, color: color))
             }
         }