fix: enforce preset profile engine compatibility

app/src/components/Generation/EngineModelSelector.tsx

@@ -57,7 +57,7 @@ function getSelectValue(engine: string, modelSize?: string): string {
   return engine;
 }
 
-function handleEngineChange(form: UseFormReturn<GenerationFormValues>, value: string) {
+export function applyEngineSelection(form: UseFormReturn<GenerationFormValues>, value: string) {
   if (value.startsWith('qwen_custom_voice:')) {
     const [, modelSize] = value.split(':');
     form.setValue('engine', 'qwen_custom_voice');
@@ -123,7 +123,7 @@ export function EngineModelSelector({ form, compact, selectedProfile }: EngineMo
 
   useEffect(() => {
     if (!currentEngineAvailable && availableOptions.length > 0) {
-      handleEngineChange(form, availableOptions[0].value);
+      applyEngineSelection(form, availableOptions[0].value);
     }
   }, [availableOptions, currentEngineAvailable, form]);
 
@@ -133,7 +133,7 @@ export function EngineModelSelector({ form, compact, selectedProfile }: EngineMo
     : undefined;
 
   return (
-    <Select value={selectValue} onValueChange={(v) => handleEngineChange(form, v)}>
+    <Select value={selectValue} onValueChange={(v) => applyEngineSelection(form, v)}>
       <FormControl>
         <SelectTrigger className={triggerClass}>
           <SelectValue />

app/src/components/Generation/GenerationForm.tsx

@@ -1,3 +1,4 @@
+import { useEffect } from 'react';
 import { Loader2, Mic } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
@@ -19,19 +20,41 @@ import {
   SelectValue,
 } from '@/components/ui/select';
 import { Textarea } from '@/components/ui/textarea';
-import { getLanguageOptionsForEngine } from '@/lib/constants/languages';
+import { getLanguageOptionsForEngine, type LanguageCode } from '@/lib/constants/languages';
 import { useGenerationForm } from '@/lib/hooks/useGenerationForm';
 import { useProfile } from '@/lib/hooks/useProfiles';
 import { useUIStore } from '@/stores/uiStore';
-import { EngineModelSelector, getEngineDescription } from './EngineModelSelector';
+import { EngineModelSelector, applyEngineSelection, getEngineDescription } from './EngineModelSelector';
 import { ParalinguisticInput } from './ParalinguisticInput';
 
+function getEngineSelectValue(engine: string): string {
+  if (engine === 'qwen') return 'qwen:1.7B';
+  if (engine === 'qwen_custom_voice') return 'qwen_custom_voice:1.7B';
+  if (engine === 'tada') return 'tada:1B';
+  return engine;
+}
+
 export function GenerationForm() {
   const selectedProfileId = useUIStore((state) => state.selectedProfileId);
   const { data: selectedProfile } = useProfile(selectedProfileId || '');
 
   const { form, handleSubmit, isPending } = useGenerationForm();
 
+  useEffect(() => {
+    if (!selectedProfile) {
+      return;
+    }
+
+    if (selectedProfile.language) {
+      form.setValue('language', selectedProfile.language as LanguageCode);
+    }
+
+    const preferredEngine = selectedProfile.default_engine || selectedProfile.preset_engine;
+    if (preferredEngine) {
+      applyEngineSelection(form, getEngineSelectValue(preferredEngine));
+    }
+  }, [form, selectedProfile]);
+
   async function onSubmit(data: Parameters<typeof handleSubmit>[0]) {
     await handleSubmit(data, selectedProfileId);
   }

app/src/components/VoiceProfiles/ProfileForm.tsx

@@ -375,6 +375,15 @@ export function ProfileForm() {
     }
   }, [availableDefaultEngines, defaultEngine]);
 
+  useEffect(() => {
+    if (!selectedPresetVoiceId) {
+      return;
+    }
+
+    if (!presetVoices.some((voice: PresetVoice) => voice.voice_id === selectedPresetVoiceId)) {
+      setSelectedPresetVoiceId('');
+    }
+  }, [presetVoices, selectedPresetVoiceId]);
   async function handleTranscribe() {
     const file = form.getValues('sampleFile');
     if (!file) {