feat(ios): tab tabanlı navigasyon ve okuma durumu takibi ekle

ios/Bookibra/Models/LibraryBook.swift

@@ -16,6 +16,9 @@ final class LibraryBook {
     var language: String?
     var sourceLocale: String?
     var remotePayloadJson: String?
+    // Optional tutulur ki eski store'lar migration sırasında kırılmasın.
+    var statusRaw: String?
+    var readingProgress: Double?
 
     init(
         localId: UUID = UUID(),
@@ -30,7 +33,9 @@ final class LibraryBook {
         dateAdded: Date = .now,
         language: String? = nil,
         sourceLocale: String? = nil,
-        remotePayloadJson: String? = nil
+        remotePayloadJson: String? = nil,
+        statusRaw: String = ReadingStatus.wantToRead.rawValue,
+        readingProgress: Double = 0
     ) {
         self.localId = localId
         self.title = title
@@ -45,6 +50,8 @@ final class LibraryBook {
         self.language = language
         self.sourceLocale = sourceLocale
         self.remotePayloadJson = remotePayloadJson
+        self.statusRaw = statusRaw
+        self.readingProgress = min(max(readingProgress, 0), 1)
     }
 
     var authors: [String] {
@@ -60,4 +67,14 @@ final class LibraryBook {
             .map { $0.trimmingCharacters(in: .whitespacesAndNewlines) }
             .filter { !$0.isEmpty }
     }
+
+    var status: ReadingStatus {
+        get { ReadingStatus(rawValue: statusRaw ?? "") ?? .wantToRead }
+        set { statusRaw = newValue.rawValue }
+    }
+
+    var readingProgressValue: Double {
+        get { min(max(readingProgress ?? 0, 0), 1) }
+        set { readingProgress = min(max(newValue, 0), 1) }
+    }
 }