Update BookPage (#55)

- Display a content as full screen
- Move info into top-right button
- Automatically push the last shown item on launch

![CleanShot 2025-04-11 at 14 58
21@2x](https://github.com/user-attachments/assets/1df28406-bdc2-4072-a63e-7eaa07a26ab4)

Author: muukii

Sources/StorybookKit/Internals/Preview/PreviewRegistryWrapper.swift

@@ -89,16 +89,24 @@ struct PreviewRegistryWrapper: Comparable {
     case "DeveloperToolsSupport.DefaultPreviewSource<SwiftUI.ViewPreviewBody>": // iOS 18
       let makeBody: MakeFunctionWrapper<any SwiftUI.View> = .init(source["structure", "singlePreview", "makeBody"])
       return {
-        VStack {
-          if let title, !title.isEmpty {
-            Text(title)
-              .font(.system(size: 17, weight: .semibold))
-          }
+        VStack {         
           AnyView(makeBody())
-          Text("\(fileID):\(line)")
-            .font(.caption.monospacedDigit())
-          BookSpacer(height: 16)
-        }
+            .toolbar { 
+              ToolbarItem(placement: .topBarTrailing) { 
+                Menu { 
+                  Button { 
+                    UIPasteboard.general.string = "\(fileID):\(line)"
+                  } label: { 
+                    Text("\(fileID):\(line)")
+                      .font(.caption.monospacedDigit())
+                  }
+                } label: {                   
+                  Image(systemName: "info.circle")                  
+                }
+
+              }
+            }         
+        }        
       }
 
     case "DeveloperToolsSupport.DefaultPreviewSource<__C.UIView>": // iOS 18

Sources/StorybookKit/Primitives/BookPage.swift

@@ -87,7 +87,7 @@ public struct BookPage: BookView, Identifiable {
             destination
           }
         } else {
-          destination
+          destination         
         }
       }
       .listStyle(.plain)

Sources/StorybookKit/StorybookDisplayRootView.swift

@@ -42,16 +42,36 @@ public struct BookActionHosting<Content: View>: View {
 }
 
 struct BookContainer: View {
-
+  
+  struct UniqueBox<T>: Hashable {
+    
+    static func == (lhs: UniqueBox<T>, rhs: UniqueBox<T>) -> Bool {
+      lhs.uuid == rhs.uuid
+    }
+    
+    func hash(into hasher: inout Hasher) {
+      hasher.combine(uuid)
+    }
+    
+    let uuid: UUID = .init()
+    let value: T
+    
+    init(value: T) {
+      self.value = value
+    }
+  }
+    
   // MARK: Properties
 
   @ObservedObject private var store: BookStore
 
-  @State private var lastUsedItem: BookPage?      
+  @State private var lastUsedItem: UniqueBox<BookPage>?      
   @State private var query: String = ""
   @State private var result: [BookPage] = []
   @State private var currentTask: Task<Void, Error>?
 
+  @State var path: NavigationPath = .init()
+  
   // MARK: Initializers
 
   @MainActor
@@ -65,7 +85,7 @@ struct BookContainer: View {
 
   public var body: some View {
 
-    NavigationStack {
+    NavigationStack(path: $path) {
       List {
 
         if result.isEmpty == false {
@@ -91,15 +111,23 @@ struct BookContainer: View {
       }
       .navigationTitle(store.title)
       .searchable(text: $query, prompt: "Search")
-        
+      .navigationDestination(for: UniqueBox<BookPage>.self) { page in
+        page
+          .value
+          .destination
+          .environment(\.bookContext, store)
+      }
     }
+    
     .tabItem {
       Image(systemName: "list.bullet")
       Text("List")
     }
     .environment(\.bookContext, store)
     .onAppear {
-      lastUsedItem = store.historyPages.first
+      if let value = store.historyPages.first {
+        path.append(UniqueBox(value: value))
+      }
     }
     .onChange(of: query, perform: { value in
 
@@ -123,13 +151,7 @@ struct BookContainer: View {
         self.result = result
       }
 
-    })
-    .sheet(item: $lastUsedItem) { item in
-      ScrollView {
-        item.destination
-          .padding(.vertical, 24)
-      }
-    }
+    })    
   }
 
 }