feat: 支持 EPUB 阅读并改善规则兼容与阅读稳定性

支持 EPUB 2/3 导入、目录、封面和章节插图，保留本地书管理与阅读进度。
修复 JSON 模板、动态替换与请求参数兼容，以及 RSS 翻页和连续滚动定位。
更新编辑器工具栏和回归测试，发布版本为 0.1.12（build 18）。

App/Features/Rules/Editor/SyntaxCodeEditor.swift

@@ -59,7 +59,12 @@ struct SyntaxCodeEditor: UIViewRepresentable {
             UIBarButtonItem(title: symbol == "\n" ? "↵" : symbol == "\t" ? "⇥" : symbol,
                 primaryAction: UIAction(title: "", subtitle: nil) { [weak view] _ in view?.insertText(symbol) })
         } + [UIBarButtonItem(systemItem: .flexibleSpace), UIBarButtonItem(title: "完成", primaryAction: UIAction(title: "", subtitle: nil) { [weak view] _ in view?.resignFirstResponder() })]
-        view.inputAccessoryView = bar
+        bar.items?.last?.accessibilityIdentifier = "syntaxCodeEditor.done"
+        if #available(iOS 26.0, *) {
+            view.inputAccessoryView = CodeInputAccessory(items: bar.items ?? [])
+        } else {
+            view.inputAccessoryView = bar
+        }
         view.text = text
         context.coordinator.highlight(view)
         return view
@@ -184,6 +189,66 @@ struct SyntaxCodeEditor: UIViewRepresentable {
     }
 }
 
+// Keep Done visible while allowing the editing shortcuts to scroll on narrow keyboards.
+private final class CodeInputAccessory: UIInputView {
+    init(items: [UIBarButtonItem]) {
+        super.init(frame: CGRect(x: 0, y: 0, width: 0, height: 44), inputViewStyle: .keyboard)
+        autoresizingMask = [.flexibleWidth]
+        backgroundColor = .secondarySystemGroupedBackground
+        let scroll = UIScrollView()
+        scroll.showsHorizontalScrollIndicator = false
+        scroll.delaysContentTouches = false
+        scroll.translatesAutoresizingMaskIntoConstraints = false
+        let stack = UIStackView()
+        stack.axis = .horizontal
+        stack.spacing = 4
+        stack.translatesAutoresizingMaskIntoConstraints = false
+        let actions = items.filter { $0.primaryAction != nil }
+        var done: UIButton?
+        for (index, item) in actions.enumerated() {
+            let button = UIButton(type: .system)
+            if let action = item.primaryAction { button.addAction(action, for: .touchUpInside) }
+            button.setImage(item.image, for: .normal)
+            button.setTitle(item.title, for: .normal)
+            button.tintColor = UIColor(ReadingTheme.accent)
+            button.titleLabel?.font = .systemFont(ofSize: 16)
+            button.accessibilityIdentifier = item.accessibilityIdentifier
+            button.accessibilityLabel = item.accessibilityLabel
+            button.translatesAutoresizingMaskIntoConstraints = false
+            if index == actions.count - 1 {
+                button.titleLabel?.font = .systemFont(ofSize: 16, weight: .semibold)
+                done = button
+                addSubview(button)
+            } else {
+                if index < 3 { button.accessibilityLabel = ["查找与替换", "撤销", "重做"][index] }
+                stack.addArrangedSubview(button)
+                button.widthAnchor.constraint(equalToConstant: 36).isActive = true
+            }
+        }
+        addSubview(scroll)
+        scroll.addSubview(stack)
+        guard let done else { return }
+        NSLayoutConstraint.activate([
+            done.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -8),
+            done.widthAnchor.constraint(equalToConstant: 60),
+            done.topAnchor.constraint(equalTo: topAnchor),
+            done.bottomAnchor.constraint(equalTo: bottomAnchor),
+            scroll.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 4),
+            scroll.trailingAnchor.constraint(equalTo: done.leadingAnchor, constant: -4),
+            scroll.topAnchor.constraint(equalTo: topAnchor),
+            scroll.bottomAnchor.constraint(equalTo: bottomAnchor),
+            stack.leadingAnchor.constraint(equalTo: scroll.contentLayoutGuide.leadingAnchor),
+            stack.trailingAnchor.constraint(equalTo: scroll.contentLayoutGuide.trailingAnchor),
+            stack.topAnchor.constraint(equalTo: scroll.contentLayoutGuide.topAnchor),
+            stack.bottomAnchor.constraint(equalTo: scroll.contentLayoutGuide.bottomAnchor),
+            stack.heightAnchor.constraint(equalTo: scroll.frameLayoutGuide.heightAnchor)
+        ])
+    }
+
+    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
+    override var intrinsicContentSize: CGSize { CGSize(width: UIView.noIntrinsicMetric, height: 44) }
+}
+
 struct RuleCodeFieldView: View {
     let title: String
     let path: String

App/Features/Rules/ReplaceRuleEditorView.swift

@@ -92,9 +92,10 @@ struct ReplaceRuleEditorView: View {
                     RuleCodeFieldView(title: "匹配内容", path: "pattern", text: $rule.pattern, language: .regex)
                 } label: { fieldPreview("匹配内容", value: rule.pattern) }
                 NavigationLink {
-                    RuleCodeFieldView(title: "替换为", path: "replacement", text: $rule.replacement, language: .regex)
+                    RuleCodeFieldView(title: "替换为", path: "replacement", text: $rule.replacement,
+                        language: rule.isRegex && rule.replacement.hasPrefix("@js:") ? .javascript : .regex)
                 } label: { fieldPreview("替换为（留空即删除）", value: rule.replacement) }
-                Text("正则替换使用 $1、$2 引用捕获组；普通文本替换按字面匹配。")
+                Text("正则替换使用 $1、$2 引用捕获组；以 @js: 开头可运行 JavaScript，result 为当前匹配文本，可读取 book 和 chapter。普通文本替换按字面匹配。")
                     .font(.footnote).foregroundStyle(.secondary)
             }
             Section("作用范围") {