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/RDEPUBNavigatorLayoutContext.swift

@@ -37,12 +37,20 @@ public struct RDEPUBNavigatorLayoutContext: Equatable {
         return CGSize(width: width, height: containerSize.height)
     }
 
+    /// Content insets that account for safe area (Dynamic Island / notch) on iPhone.
+    /// Uses the larger of safeAreaInsets and reflowableContentInsets for top/bottom
+    /// to ensure content is never hidden under the Dynamic Island or home indicator.
+    public var safeReflowableContentInsets: UIEdgeInsets {
+        let top = max(safeAreaInsets.top, reflowableContentInsets.top)
+        let bottom = max(safeAreaInsets.bottom, reflowableContentInsets.bottom)
+        let left = max(safeAreaInsets.left, reflowableContentInsets.left)
+        let right = max(safeAreaInsets.right, reflowableContentInsets.right)
+        return UIEdgeInsets(top: top, left: left, bottom: bottom, right: right)
+    }
+
+    /// Fixed layout content insets that respect safe areas on all devices including iPhone.
     public var fixedContentInset: UIEdgeInsets {
         var insets = safeAreaInsets
-        if userInterfaceIdiom != .phone {
-            insets = .zero
-        }
-
         let horizontalInsets = max(insets.left, insets.right)
         insets.left = horizontalInsets
         insets.right = horizontalInsets