fix: 修复右对齐短文本显示不完整及多项功能改进

右对齐文本显示修复（如"巫鸿"只显示"鸿"的问题）:
- RDEPUBChapterTailNormalizer: 短尾页合并时检查 avoidPageBreakInside 语义，
  避免将带有此标记的短文本（如 right-info 署名）错误合并回上一页
- RDEPUBTextContentView: 续段归一化时跳过右对齐/居中对齐的段落，
  防止错误修改 firstLineHeadIndent 导致首字不可见
- RDEPUBCSSCompatibilityLayer: 为含 text-align:right/center 的 CSS 块
  自动注入 text-indent:0 !important，确保右对齐/居中文本无首行缩进
- RDEPUBTextRendererSupport: 排版属性归一化时将右对齐/居中段落的
  firstLineHeadIndent 重置为 0

图片查看器及脚注点击功能:
- 新增 RDEPUBImageViewController 和 RDEPUBImageViewerCoordinator，
  支持从 WebView 和 TextPage 两种模式查看图片
- epub-bridge.js: 检测图片和脚注图片的点击事件，脚注图片显示弹窗
- RDEPUBJavaScriptBridge: 新增 imageDidTap/footnoteDidTap 桥接消息
- RDEPUBWebView: 新增图片和脚注点击的 delegate 方法
- RDEPUBAttachmentNormalizer: 改进脚注检测，优先使用 alt 文本判断
- RDEPUBPaginationModels: 新增 .footnote 附件类型
- RDEPUBPageLayoutSnapshot: 运行时动态解析附件类型，脚注优先级高于图片

位置解析改进:
- RDEPUBReaderController+LocationResolution: 利用 rangeInfo 提升页码定位精度

其他:
- RDEPUBTextBookCache: schema 版本升级至 13
- RDEPUBReaderTheme: 主题更新
- Pod 项目文件更新

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

Sources/RDReaderView/EPUBUI/TextPage/RDEPUBPageLayoutSnapshot.swift

@@ -200,10 +200,23 @@ struct RDEPUBPageLayoutSnapshot {
         let placement = page.metadata.attachmentPlacements.indices.contains(attachmentIndex)
             ? page.metadata.attachmentPlacements[attachmentIndex]
             : nil
-        let kind = page.metadata.attachmentKinds.indices.contains(attachmentIndex)
+        let metadataKind = page.metadata.attachmentKinds.indices.contains(attachmentIndex)
             ? page.metadata.attachmentKinds[attachmentIndex]
             : nil
-        return (placement, kind)
+        let resolvedKind = attachmentKind(at: range, on: page) ?? metadataKind
+        return (placement, resolvedKind)
+    }
+
+    private static func attachmentKind(
+        at range: NSRange,
+        on page: RDEPUBTextPage
+    ) -> RDEPUBTextAttachmentKind? {
+        guard range.location >= 0,
+              range.location < page.chapterContent.length else {
+            return nil
+        }
+        let attributes = page.chapterContent.attributes(at: range.location, effectiveRange: nil)
+        return RDEPUBAttachmentNormalizer.attachmentKind(for: attributes)
     }
 
     private static func offset(_ range: NSRange, by offset: Int) -> NSRange {

Sources/RDReaderView/EPUBUI/TextPage/RDEPUBTextContentView.swift

@@ -19,6 +19,13 @@ protocol RDEPUBTextContentViewDelegate: AnyObject {
         sourceRect: CGRect,
         sourcePoint: CGPoint
     )
+
+    func textContentView(
+        _ contentView: RDEPUBTextContentView,
+        didActivateImage image: UIImage,
+        sourceRect: CGRect,
+        altText: String?
+    )
     func textContentView(
         _ contentView: RDEPUBTextContentView,
         didRequestHighlightActions highlight: RDEPUBHighlight,
@@ -26,6 +33,17 @@ protocol RDEPUBTextContentViewDelegate: AnyObject {
     )
 }
 
+extension RDEPUBTextContentViewDelegate {
+    func textContentView(
+        _ contentView: RDEPUBTextContentView,
+        didActivateImage image: UIImage,
+        sourceRect: CGRect,
+        altText: String?
+    ) {
+        // Default: no-op. Implementors can present an image viewer.
+    }
+}
+
 final class RDEPUBTextContentView: UIView, UIGestureRecognizerDelegate, RDReaderCachePolicyProviding {
 
     private var contentInsets: UIEdgeInsets = .zero
@@ -508,6 +526,16 @@ final class RDEPUBTextContentView: UIView, UIGestureRecognizerDelegate, RDReader
         return nil
     }
 
+    private func imageFromPage(attachment: RDEPUBPageAttachment, page: RDEPUBTextPage) -> UIImage? {
+        guard page.chapterContent.length > attachment.stringRange.location else { return nil }
+        let attachmentValue = page.chapterContent.attribute(
+            .attachment,
+            at: attachment.stringRange.location,
+            effectiveRange: nil
+        )
+        return image(from: attachmentValue)
+    }
+
     private func applyHighlightsToContent(
         _ content: NSMutableAttributedString,
         highlights: [RDEPUBHighlight],
@@ -539,6 +567,9 @@ final class RDEPUBTextContentView: UIView, UIGestureRecognizerDelegate, RDReader
         let text = content.string as NSString
         let firstParagraphRange = text.paragraphRange(for: NSRange(location: 0, length: 0))
         guard firstParagraphRange.length > 0 else { return content }
+        guard !firstParagraphUsesNonLeadingAlignment(in: content, range: firstParagraphRange) else {
+            return content
+        }
 
         content.enumerateAttribute(.paragraphStyle, in: firstParagraphRange) { value, range, _ in
             guard let style = value as? NSParagraphStyle else { return }
@@ -558,6 +589,21 @@ final class RDEPUBTextContentView: UIView, UIGestureRecognizerDelegate, RDReader
         return !CharacterSet.newlines.contains(previousScalar)
     }
 
+    private func firstParagraphUsesNonLeadingAlignment(
+        in content: NSAttributedString,
+        range: NSRange
+    ) -> Bool {
+        var usesNonLeadingAlignment = false
+        content.enumerateAttribute(.paragraphStyle, in: range) { value, _, stop in
+            guard let style = value as? NSParagraphStyle else { return }
+            if style.alignment == .right || style.alignment == .center {
+                usesNonLeadingAlignment = true
+                stop.pointee = true
+            }
+        }
+        return usesNonLeadingAlignment
+    }
+
 #if canImport(DTCoreText)
 
     private func updateCoreTextLayoutFrameIfNeeded() {
@@ -650,6 +696,29 @@ final class RDEPUBTextContentView: UIView, UIGestureRecognizerDelegate, RDReader
             clearSelection()
             return
         }
+        // PRIORITY: Check for attachment tap
+        if let page = currentPage,
+           let attachment = interactionController.snapshot?.attachment(at: point) {
+            let kind = attachment.kind
+            let sourceRect = attachmentSourceRect(at: point, fallbackPoint: point) ?? CGRect.zero
+            // Footnote attachments carry their note text in alt/accessibility metadata.
+            // Prefer that semantic text over image preview even if attachment kind metadata is incomplete.
+            if let footnoteText = attachmentText(at: point), kind == .footnote || !footnoteText.isEmpty {
+                delegate?.textContentView(
+                    self,
+                    didActivateAttachmentText: footnoteText,
+                    sourceRect: sourceRect,
+                    sourcePoint: convert(point, from: overlayView)
+                )
+                return
+            }
+            // Regular image attachments: present image viewer
+            if let image = imageFromPage(attachment: attachment, page: page) {
+                let altText = attachmentText(at: point)
+                delegate?.textContentView(self, didActivateImage: image, sourceRect: sourceRect, altText: altText)
+                return
+            }
+        }
         if let attachmentText = attachmentText(at: point),
            let sourceRect = attachmentSourceRect(at: point, fallbackPoint: point) {
             delegate?.textContentView(