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/EPUBUI/RDEPUBReaderController+DataSource.swift

@@ -390,9 +390,6 @@ extension RDEPUBReaderController: RDReaderDataSource, RDReaderPageProvider, RDRe
         if let location = fallbackLocation(for: effectivePageNum) {
             persist(location: location)
         }
-        if readingSession?.navigatorState == .jumping || readingSession?.navigatorState == .moving {
-            readingSession?.transition(to: .idle)
-        }
 
         runtime.locationCoordinator.recordPageChangeIfNeeded()
     }
@@ -432,8 +429,9 @@ extension RDEPUBReaderController: RDReaderDataSource, RDReaderPageProvider, RDRe
 
             let currentSize = self.readerView.resolvedSinglePageSize(pageNum: self.readerView.currentPage)
             guard currentSize.width > 0, currentSize.height > 0 else { return }
-            let stillChanged = abs(currentSize.width - self.lastTextPaginationPageSize!.width) > 0.5
-                || abs(currentSize.height - self.lastTextPaginationPageSize!.height) > 0.5
+            guard let previousPageSize = self.lastTextPaginationPageSize else { return }
+            let stillChanged = abs(currentSize.width - previousPageSize.width) > 0.5
+                || abs(currentSize.height - previousPageSize.height) > 0.5
             guard stillChanged else { return }
             self.repaginatePreservingCurrentLocation()
         }