feat: migrate on-device Qwen3 ASR to CoreML for background Flow dictation

Replace MLX GPU inference with CoreML bundles so transcription continues
while the host app is backgrounded. Adds model download and warm-up,
vendored Qwen3Speech, and updates onboarding, settings, and copy for the
~1.6 GB CoreML package (iOS 18+).

OSGKeyboardShared/Utilities/ProviderDisplayName.swift

@@ -6,9 +6,12 @@
 import Foundation
 
 public enum ProviderDisplayName {
-    public static func name(for providerId: String) -> String {
+    public static func name(
+        for providerId: String,
+        language: AppUILanguage? = nil
+    ) -> String {
         let key = "provider.\(providerId)"
-        let localized = NSLocalizedString(key, comment: "")
+        let localized = SharedL10n.string(key, language: language)
         if localized != key { return localized }
         return LLMProvider.provider(id: providerId).name
     }