feat: ios mobil arayüz tasarımı

ios/Bookibra/ViewModels/HomeViewModel.swift

@@ -0,0 +1,61 @@
+import Foundation
+import SwiftUI
+
+struct ShelfCategory: Identifiable {
+    let id: String
+    let name: String
+    let books: [BookRemote]
+}
+
+@MainActor
+final class HomeViewModel: ObservableObject {
+    @Published var categories: [ShelfCategory] = []
+
+    func refresh(from localBooks: [LibraryBook]) {
+        var map: [String: [BookRemote]] = [:]
+        for local in localBooks {
+            let targets = local.categories.isEmpty ? ["Design"] : local.categories
+            let remote = Self.makeRemote(from: local)
+            for name in targets {
+                map[name, default: []].append(remote)
+            }
+        }
+
+        let preferred = ["Design", "Psychology", "Novels"]
+        var built = preferred.map { name in
+            ShelfCategory(id: name, name: name, books: map[name] ?? [])
+        }
+
+        let extras = map.keys
+            .filter { !preferred.contains($0) }
+            .sorted()
+            .map { ShelfCategory(id: $0, name: $0, books: map[$0] ?? []) }
+        built.append(contentsOf: extras)
+
+        categories = built
+    }
+
+    func gradient(for name: String) -> LinearGradient {
+        switch name.lowercased() {
+        case "design": return Theme.designShelf
+        case "psychology": return Theme.psychologyShelf
+        case "novels": return Theme.novelsShelf
+        default: return Theme.novelsShelf
+        }
+    }
+
+    private static func makeRemote(from local: LibraryBook) -> BookRemote {
+        BookRemote(
+            title: local.title,
+            authors: local.authors,
+            publishedYear: local.publishedYear,
+            isbn10: local.isbn10,
+            isbn13: local.isbn13,
+            coverImageUrl: local.coverUrlString.flatMap(URL.init(string:)),
+            language: local.language,
+            description: local.summary,
+            categories: local.categories,
+            sourceLocale: local.sourceLocale
+        )
+    }
+}