refactor(speech): drop quantized whisper variants; migrate speech screens

- `models.speech_to_text.whisper_{tiny,base,small}_en` switch from
  `pair(base, quantized)` to `base(...)`. The quantized whisper builds
  are slated for removal (#1134-followup) — picking them up by default
  was wrong even before they go away.
- `apps/speech/screens/{TextToSpeechScreen,TextToSpeechLLMScreen,Quiz}.tsx`
  migrated from the bare `KOKORO_*` constants to
  `models.text_to_speech.<lang>.<voice>()`.
- `SpeechToTextScreen` and `voice_chat` pickers drop the "Whisper Tiny Q"
  duplicate entry now that there's a single Whisper Tiny variant.

Author: msluszniak

apps/llm/app/voice_chat/index.tsx

@@ -43,10 +43,6 @@ const LLM_MODELS: ModelOption<LLMModelSources>[] = [
 const STT_MODELS: ModelOption<STTModelSources>[] = [
   {
     label: 'Whisper Tiny',
-    value: models.speech_to_text.whisper_tiny_en({ quant: false }),
-  },
-  {
-    label: 'Whisper Tiny Q',
     value: models.speech_to_text.whisper_tiny_en(),
   },
   {
@@ -73,7 +69,7 @@ function VoiceChatScreen() {
     models.llm.qwen3_0_6b()
   );
   const [selectedSTT, setSelectedSTT] = useState<STTModelSources>(
-    models.speech_to_text.whisper_tiny_en({ quant: false })
+    models.speech_to_text.whisper_tiny_en()
   );
   const [error, setError] = useState<string | null>(null);
 

apps/speech/screens/Quiz.tsx

@@ -17,10 +17,7 @@ import Animated, {
   runOnJS,
 } from 'react-native-reanimated';
 import { SafeAreaProvider, SafeAreaView } from 'react-native-safe-area-context';
-import {
-  KOKORO_AMERICAN_ENGLISH_MALE_SANTA,
-  useTextToSpeech,
-} from 'react-native-executorch';
+import { models, useTextToSpeech } from 'react-native-executorch';
 import {
   AudioManager,
   AudioContext,
@@ -59,7 +56,7 @@ const createAudioBufferFromVector = (
 
 export const Quiz = ({ onBack }: { onBack: () => void }) => {
   // --- Hooks & State ---
-  const model = useTextToSpeech(KOKORO_AMERICAN_ENGLISH_MALE_SANTA);
+  const model = useTextToSpeech(models.text_to_speech.en_us.santa());
 
   const [shuffledQuestions] = useState(() => shuffleArray(QUESTIONS));
   const [currentIndex, setCurrentIndex] = useState(0);

apps/speech/screens/SpeechToTextScreen.tsx

@@ -25,10 +25,6 @@ type STTModelSources = SpeechToTextProps['model'];
 const MODELS: ModelOption<STTModelSources>[] = [
   {
     label: 'Whisper Tiny',
-    value: speechToText.whisper_tiny_en({ quant: false }),
-  },
-  {
-    label: 'Whisper Tiny Q',
     value: speechToText.whisper_tiny_en(),
   },
   {
@@ -57,7 +53,7 @@ const isSimulator = DeviceInfo.isEmulatorSync();
 
 export const SpeechToTextScreen = ({ onBack }: { onBack: () => void }) => {
   const [selectedModel, setSelectedModel] = useState<STTModelSources>(
-    speechToText.whisper_tiny_en({ quant: false })
+    speechToText.whisper_tiny_en()
   );
 
   const model = useSpeechToText({

apps/speech/screens/TextToSpeechLLMScreen.tsx

@@ -9,12 +9,7 @@ import {
 import { SafeAreaProvider, SafeAreaView } from 'react-native-safe-area-context';
 import FontAwesome from '@expo/vector-icons/FontAwesome';
 import SWMIcon from '../assets/swm_icon.svg';
-import {
-  useLLM,
-  useTextToSpeech,
-  KOKORO_AMERICAN_ENGLISH_FEMALE_HEART,
-  LLAMA3_2_1B_QLORA,
-} from 'react-native-executorch';
+import { models, useLLM, useTextToSpeech } from 'react-native-executorch';
 import {
   AudioManager,
   AudioContext,
@@ -52,8 +47,8 @@ const createAudioBufferFromVector = (
 export const TextToSpeechLLMScreen = ({ onBack }: TextToSpeechLLMProps) => {
   const [displayText, setDisplayText] = useState('');
   const [isTtsStreaming, setIsTtsStreaming] = useState(false);
-  const llm = useLLM({ model: LLAMA3_2_1B_QLORA });
-  const tts = useTextToSpeech(KOKORO_AMERICAN_ENGLISH_FEMALE_HEART);
+  const llm = useLLM({ model: models.llm.llama3_2_1b() });
+  const tts = useTextToSpeech(models.text_to_speech.en_us.heart());
 
   const processedLengthRef = useRef(0);
   const audioContextRef = useRef<AudioContext | null>(null);

apps/speech/screens/TextToSpeechScreen.tsx

@@ -10,52 +10,35 @@ import {
 } from 'react-native';
 import { SafeAreaProvider, SafeAreaView } from 'react-native-safe-area-context';
 import {
+  models,
   useTextToSpeech,
   TextToSpeechModelConfig,
-  KOKORO_AMERICAN_ENGLISH_FEMALE_HEART,
-  KOKORO_AMERICAN_ENGLISH_FEMALE_RIVER,
-  KOKORO_AMERICAN_ENGLISH_FEMALE_SARAH,
-  KOKORO_AMERICAN_ENGLISH_MALE_ADAM,
-  KOKORO_AMERICAN_ENGLISH_MALE_MICHAEL,
-  KOKORO_AMERICAN_ENGLISH_MALE_SANTA,
-  KOKORO_BRITISH_ENGLISH_FEMALE_EMMA,
-  KOKORO_BRITISH_ENGLISH_MALE_DANIEL,
-  KOKORO_FRENCH_FEMALE_SIWIS,
-  KOKORO_SPANISH_FEMALE_DORA,
-  KOKORO_SPANISH_MALE_ALEX,
-  KOKORO_ITALIAN_FEMALE_SARA,
-  KOKORO_ITALIAN_MALE_NICOLA,
-  KOKORO_PORTUGUESE_FEMALE_DORA,
-  KOKORO_PORTUGUESE_MALE_SANTA,
-  KOKORO_GERMAN_FEMALE_ANNA,
-  KOKORO_POLISH_MALE_MATEUSZ,
-  KOKORO_HINDI_FEMALE_ALPHA,
-  KOKORO_HINDI_MALE_OMEGA,
-  KOKORO_HINDI_MALE_PSI,
 } from 'react-native-executorch';
 import { ModelPicker, ModelOption } from '../components/ModelPicker';
 
+const tts = models.text_to_speech;
+
 const VOICES: ModelOption<TextToSpeechModelConfig>[] = [
-  { label: '🇺🇸 AF Heart', value: KOKORO_AMERICAN_ENGLISH_FEMALE_HEART },
-  { label: '🇺🇸 AF River', value: KOKORO_AMERICAN_ENGLISH_FEMALE_RIVER },
-  { label: '🇺🇸 AF Sarah', value: KOKORO_AMERICAN_ENGLISH_FEMALE_SARAH },
-  { label: '🇺🇸 AM Adam', value: KOKORO_AMERICAN_ENGLISH_MALE_ADAM },
-  { label: '🇺🇸 AM Michael', value: KOKORO_AMERICAN_ENGLISH_MALE_MICHAEL },
-  { label: '🇺🇸 AM Santa', value: KOKORO_AMERICAN_ENGLISH_MALE_SANTA },
-  { label: '🇬🇧 BF Emma', value: KOKORO_BRITISH_ENGLISH_FEMALE_EMMA },
-  { label: '🇬🇧 BM Daniel', value: KOKORO_BRITISH_ENGLISH_MALE_DANIEL },
-  { label: '🇫🇷 FF Siwis', value: KOKORO_FRENCH_FEMALE_SIWIS },
-  { label: '🇪🇸 EF Dora', value: KOKORO_SPANISH_FEMALE_DORA },
-  { label: '🇪🇸 EM Alex', value: KOKORO_SPANISH_MALE_ALEX },
-  { label: '🇮🇹 IF Sara', value: KOKORO_ITALIAN_FEMALE_SARA },
-  { label: '🇮🇹 IM Nicola', value: KOKORO_ITALIAN_MALE_NICOLA },
-  { label: '🇵🇹 PF Dora', value: KOKORO_PORTUGUESE_FEMALE_DORA },
-  { label: '🇵🇹 PM Santa', value: KOKORO_PORTUGUESE_MALE_SANTA },
-  { label: '🇩🇪 DF Anna', value: KOKORO_GERMAN_FEMALE_ANNA },
-  { label: '🇵🇱 PM Mateusz', value: KOKORO_POLISH_MALE_MATEUSZ },
-  { label: '🇮🇳 HF Alpha', value: KOKORO_HINDI_FEMALE_ALPHA },
-  { label: '🇮🇳 HM Omega', value: KOKORO_HINDI_MALE_OMEGA },
-  { label: '🇮🇳 HM Psi', value: KOKORO_HINDI_MALE_PSI },
+  { label: '🇺🇸 AF Heart', value: tts.en_us.heart() },
+  { label: '🇺🇸 AF River', value: tts.en_us.river() },
+  { label: '🇺🇸 AF Sarah', value: tts.en_us.sarah() },
+  { label: '🇺🇸 AM Adam', value: tts.en_us.adam() },
+  { label: '🇺🇸 AM Michael', value: tts.en_us.michael() },
+  { label: '🇺🇸 AM Santa', value: tts.en_us.santa() },
+  { label: '🇬🇧 BF Emma', value: tts.en_gb.emma() },
+  { label: '🇬🇧 BM Daniel', value: tts.en_gb.daniel() },
+  { label: '🇫🇷 FF Siwis', value: tts.fr.siwis() },
+  { label: '🇪🇸 EF Dora', value: tts.es.dora() },
+  { label: '🇪🇸 EM Alex', value: tts.es.alex() },
+  { label: '🇮🇹 IF Sara', value: tts.it.sara() },
+  { label: '🇮🇹 IM Nicola', value: tts.it.nicola() },
+  { label: '🇵🇹 PF Dora', value: tts.pt.dora() },
+  { label: '🇵🇹 PM Santa', value: tts.pt.santa() },
+  { label: '🇩🇪 DF Anna', value: tts.de.anna() },
+  { label: '🇵🇱 PM Mateusz', value: tts.pl.mateusz() },
+  { label: '🇮🇳 HF Alpha', value: tts.hi.alpha() },
+  { label: '🇮🇳 HM Omega', value: tts.hi.omega() },
+  { label: '🇮🇳 HM Psi', value: tts.hi.psi() },
 ];
 
 import FontAwesome from '@expo/vector-icons/FontAwesome';
@@ -95,7 +78,7 @@ const createAudioBufferFromVector = (
 
 export const TextToSpeechScreen = ({ onBack }: { onBack: () => void }) => {
   const [selectedSpeaker, setSelectedSpeaker] =
-    useState<TextToSpeechModelConfig>(KOKORO_AMERICAN_ENGLISH_FEMALE_HEART);
+    useState<TextToSpeechModelConfig>(tts.en_us.heart());
 
   const model = useTextToSpeech(selectedSpeaker);
 

packages/react-native-executorch/src/constants/modelRegistry.ts

@@ -486,9 +486,9 @@ export const models = {
     udnie: variant(STYLE_TRANSFER_UDNIE_VARIANTS, COREML_ON_IOS),
   },
   speech_to_text: {
-    whisper_tiny_en: pair(M.WHISPER_TINY_EN, M.WHISPER_TINY_EN_QUANTIZED),
-    whisper_base_en: pair(M.WHISPER_BASE_EN, M.WHISPER_BASE_EN_QUANTIZED),
-    whisper_small_en: pair(M.WHISPER_SMALL_EN, M.WHISPER_SMALL_EN_QUANTIZED),
+    whisper_tiny_en: base(M.WHISPER_TINY_EN),
+    whisper_base_en: base(M.WHISPER_BASE_EN),
+    whisper_small_en: base(M.WHISPER_SMALL_EN),
     whisper_tiny: base(M.WHISPER_TINY),
     whisper_base: base(M.WHISPER_BASE),
     whisper_small: base(M.WHISPER_SMALL),