feat: default language to auto-detect on first install

Remove system language detection on onboarding; new installs start
with auto-detect instead of matching system locale. Also removes the
now-dead getSystemLanguage() helper.

Author: axot

OpenSuperMLX/Onboarding/OnboardingView.swift

@@ -47,9 +47,8 @@ class OnboardingViewModel: ObservableObject {
     private var downloadTask: Task<Void, Error>?
 
     init() {
-        let systemLanguage = LanguageUtil.getSystemLanguage()
-        AppPreferences.shared.mlxLanguage = systemLanguage
-        self.selectedLanguage = systemLanguage
+        AppPreferences.shared.mlxLanguage = "auto"
+        self.selectedLanguage = "auto"
         self.useAsianAutocorrect = AppPreferences.shared.useAsianAutocorrect
 
         initializeModels()

OpenSuperMLX/Utils/AppPreferences.swift

@@ -47,7 +47,7 @@ final class AppPreferences {
     @UserDefault(key: "selectedMLXModel", defaultValue: "mlx-community/Qwen3-ASR-1.7B-8bit")
     var selectedMLXModel: String
 
-    @UserDefault(key: "mlxLanguage", defaultValue: "en")
+    @UserDefault(key: "mlxLanguage", defaultValue: "auto")
     var mlxLanguage: String
 
     // Transcription settings

OpenSuperMLX/Utils/LanguageUtil.swift

@@ -28,13 +28,4 @@ class LanguageUtil {
         "hi": "Hindi",
         "fi": "Finnish",
     ]
-
-    static func getSystemLanguage() -> String {
-        if let preferredLanguage = Locale.preferredLanguages.first {
-            let preferredLanguage = preferredLanguage.prefix(2).lowercased()
-            return availableLanguages.contains(preferredLanguage) ? preferredLanguage : "en"
-        } else {
-            return "eng"
-        }
-    }
 }