Fix SwiftLint closure body length violation in TranslationsMiddleware

Author: razvanlitianu

firefox-ios/Client/Frontend/Translations/TranslationsMiddleware.swift

@@ -196,22 +196,26 @@ final class TranslationsMiddleware: FeatureFlaggable {
         return true
     }
 
+    /// Returns the list of target languages to check for translation eligibility.
+    /// When the language picker flag is ON, returns the user's full preferred list.
+    /// When OFF, returns only the primary device language (preserving legacy behavior).
+    private func targetLanguagesForEligibilityCheck() async -> [String] {
+        if featureFlags.isFeatureEnabled(.translationLanguagePicker, checking: .buildOnly) {
+            let manager = PreferredTranslationLanguagesManager(prefs: profile.prefs)
+            let supported = await translationsService.fetchSupportedTargetLanguages()
+            return manager.preferredLanguages(supportedTargetLanguages: supported)
+        }
+        return [Locale.current.languageCode].compactMap { $0 }
+    }
+
     /// Checks whether the current page in the active tab is eligible for translation,
     /// and if so, dispatches a toolbar action to update the translation state.
     private func checkTranslationsAreEligible(for action: ToolbarAction) {
         Task { @MainActor in
             guard action.translationConfiguration?.isTranslationFeatureEnabled == true else { return }
 
             do {
-                let preferredLanguages: [String]
-                if featureFlags.isFeatureEnabled(.translationLanguagePicker, checking: .buildOnly) {
-                    let manager = PreferredTranslationLanguagesManager(prefs: profile.prefs)
-                    let supported = await translationsService.fetchSupportedTargetLanguages()
-                    preferredLanguages = manager.preferredLanguages(supportedTargetLanguages: supported)
-                } else {
-                    preferredLanguages = [Locale.current.languageCode].compactMap { $0 }
-                }
-
+                let preferredLanguages = await targetLanguagesForEligibilityCheck()
                 let isEligible = try await translationsService.shouldOfferTranslation(
                     for: action.windowUUID,
                     using: preferredLanguages