feat: chapter runtime refactoring and related updates

- Refactor chapter runtime: replace window coordinator/snapshot with warmup orchestrator
- Update EPUB core: parser, reading session, JS bridge, navigator layout
- Update reader controller: data source, location resolution, persistence
- Update chapter runtime: data cache, loader, runtime store, disk cache, warmup orchestrator
- Remove deprecated navigation state machine and pagination state
- Update text rendering: book cache, HTML normalizer
- Update UI: text content view, dark image adjuster, text selection controller
- Update settings and reader configuration
- Add CODE_REVIEW.md and AUDIT_FINAL.md documentation
- Update pod dependencies (remove SSAlertSwift, SnapKit)
- Update podspec and pod configuration files

Co-Authored-By: Claude <noreply@anthropic.com>

Sources/RDReaderView/EPUBCore/RDEPUBReadingSession.swift

@@ -7,18 +7,10 @@ public final class RDEPUBReadingSession {
 
     public let publication: RDEPUBPublication
 
-    public private(set) var navigatorState: RDEPUBNavigatorState = .initializing
-
     public private(set) var activePages: [EPUBPage] = []
 
     public private(set) var activeChapters: [EPUBChapterInfo] = []
 
-    public private(set) var stagedPages: [EPUBPage]?
-
-    public private(set) var stagedChapters: [EPUBChapterInfo]?
-
-    public private(set) var stagedRestoreLocation: RDEPUBLocation?
-
     public private(set) var pendingNavigationLocation: RDEPUBLocation?
 
     public private(set) var pendingNavigationPageNum: Int?
@@ -37,16 +29,10 @@ public final class RDEPUBReadingSession {
         publication.resourceResolver
     }
 
-    public func transition(to state: RDEPUBNavigatorState) {
-        navigatorState = state
-    }
-
     public func resetRuntimeState() {
-        navigatorState = .initializing
         activePages = []
         activeChapters = []
         clearPendingNavigation()
-        clearStagedSnapshot()
         currentViewport = nil
         currentReadingContext = nil
     }
@@ -56,36 +42,6 @@ public final class RDEPUBReadingSession {
         activeChapters = snapshot.chapters
     }
 
-    public func stageSnapshot(_ snapshot: PaginationSnapshot, restoreLocation: RDEPUBLocation?) {
-        stagedPages = snapshot.pages
-        stagedChapters = snapshot.chapters
-        stagedRestoreLocation = restoreLocation
-    }
-
-    public func stagedSnapshot() -> PaginationSnapshot? {
-        guard let stagedPages, let stagedChapters else {
-            return nil
-        }
-        return (stagedPages, stagedChapters)
-    }
-
-    public func consumeStagedSnapshotIfAllowed() -> (snapshot: PaginationSnapshot, restoreLocation: RDEPUBLocation?)? {
-        guard navigatorState.isStableForSnapshotApplication,
-              let stagedPages,
-              let stagedChapters else {
-            return nil
-        }
-        let restoreLocation = stagedRestoreLocation
-        clearStagedSnapshot()
-        return ((stagedPages, stagedChapters), restoreLocation)
-    }
-
-    public func clearStagedSnapshot() {
-        stagedPages = nil
-        stagedChapters = nil
-        stagedRestoreLocation = nil
-    }
-
     public func clearPendingNavigation() {
         pendingNavigationLocation = nil
         pendingNavigationPageNum = nil
@@ -241,7 +197,6 @@ public final class RDEPUBReadingSession {
         pendingNavigationLocation = shouldKeepPendingNavigation ? normalizedLocation : nil
         pendingNavigationPageNum = shouldKeepPendingNavigation ? pageIndex + 1 : nil
         pendingNavigationHighlightRangeInfo = hasTargetHighlightRangeInfo ? targetHighlightRangeInfo : nil
-        transition(to: .jumping)
         return pageIndex + 1
     }
 
@@ -292,9 +247,6 @@ public final class RDEPUBReadingSession {
         if pendingNavigationPageNum == pageNumber {
             clearPendingNavigation()
         }
-        if navigatorState == .jumping || navigatorState == .moving {
-            transition(to: .idle)
-        }
     }
 
     public func currentReadingLocation(bookIdentifier: String?) -> RDEPUBLocation? {