앱 언어 설정이 한국어("ko")이면 Pretendard 폰트 그 외에는 시스템 폰트하는 FontModifier 추가

SodaLive/Sources/Extensions/KoreanFontModifier.swift

@@ -0,0 +1,43 @@
+//
+//  KoreanFontModifier.swift
+//  SodaLive
+//
+//  Created by klaus on 1/23/26.
+//
+
+import SwiftUI
+
+struct KoreanFontModifier: ViewModifier {
+    @Environment(\.locale) private var locale
+    let size: CGFloat
+    let weight: SwiftUI.Font.Weight
+
+    private func resolvedLanguageCode() -> String? {
+        if let raw = UserDefaults.standard.string(forKey: "app.language"),
+           let option = LanguageOption(rawValue: raw),
+           option != .system {
+            return option.rawValue
+        }
+        return locale.language.languageCode?.identifier
+    }
+    
+    func body(content: Content) -> some View {
+        if resolvedLanguageCode() == "ko" {
+            let name: String = switch weight {
+            case .bold: "Pretendard-Bold"
+            case .medium: "Pretendard-Medium"
+            case .light: "Pretendard-Light"
+            default: "Pretendard-Regular"
+            }
+            content.font(.custom(name, size: size))
+        } else {
+            content.font(.system(size: size, weight: weight))
+        }
+    }
+}
+
+extension View {
+    func appFont(size: CGFloat, weight: SwiftUI.Font.Weight = .regular) -> some View {
+        self.modifier(KoreanFontModifier(size: size, weight: weight))
+    }
+}