feat: ios mobil arayüz tasarımı

ios/Bookibra/DesignSystem/Theme.swift

@@ -0,0 +1,29 @@
+import SwiftUI
+
+enum Theme {
+    static let background = Color(red: 0.97, green: 0.96, blue: 0.94)
+    static let textPrimary = Color.black
+    static let textSecondary = Color.gray
+
+    static let designShelf = LinearGradient(
+        colors: [Color(red: 0.87, green: 0.66, blue: 0.45), Color(red: 0.79, green: 0.55, blue: 0.34)],
+        startPoint: .top,
+        endPoint: .bottom
+    )
+
+    static let psychologyShelf = LinearGradient(
+        colors: [Color(red: 0.58, green: 0.67, blue: 0.78), Color(red: 0.45, green: 0.55, blue: 0.66)],
+        startPoint: .top,
+        endPoint: .bottom
+    )
+
+    static let novelsShelf = LinearGradient(
+        colors: [Color.white, Color(red: 0.9, green: 0.9, blue: 0.9)],
+        startPoint: .top,
+        endPoint: .bottom
+    )
+
+    static func headerSerif(size: CGFloat) -> Font {
+        .custom("NewYork-Regular", size: size, relativeTo: .largeTitle)
+    }
+}