增加进入书籍阅读时动画效果的配置

高级设置：延缓书籍加载、使用共享元素动画

app/src/main/java/io/legato/kazusa/constant/PreferKey.kt

@@ -208,6 +208,7 @@ object PreferKey {
     const val paddingDisplayCutouts = "paddingDisplayCutouts"
 
     const val delayBookLoadEnable = "delayBookLoadEnable"
+    const val sharedElementEnterTransitionEnable = "sharedElementEnterTransitionEnable"
 
     const val bookshelfLayoutGridLandscape = "bookshelfLayoutGridLandscape"