refactor: align two-stems preference name

Co-authored-by: OpenCode <noreply@opencode.ai>

Author: hi-ogawa

packages/app/src/app.tsx

@@ -31,8 +31,7 @@ export function App() {
     Partial<Record<ModelFilename, string>>
   >({});
 
-  const { model, method, shifts } = preferences;
-  const twoStems = preferences.targetStem;
+  const { model, method, shifts, twoStems } = preferences;
 
   const selectedModelFiles = Object.values(modelFiles);
   const requiredFiles = requiredModelFiles(
@@ -264,8 +263,8 @@ export function App() {
                     onChange={(event) =>
                       setPreferences((current) => ({
                         ...current,
-                        targetStem: (event.target.value ||
-                          null) as typeof current.targetStem,
+                        twoStems: (event.target.value ||
+                          null) as typeof current.twoStems,
                       }))
                     }
                   >

packages/app/src/lib/preferences.ts

@@ -4,7 +4,7 @@ const STORAGE_KEY = "demucs-onnx:main:v2";
 
 const preferencesSchema = z.object({
   model: z.enum(["htdemucs", "htdemucs_ft"]),
-  targetStem: z.enum(["drums", "bass", "other", "vocals"]).nullable(),
+  twoStems: z.enum(["drums", "bass", "other", "vocals"]).nullable(),
   method: z.enum(["add", "minus"]),
   shifts: z.number().int().min(1).max(4),
 });
@@ -13,7 +13,7 @@ export type Preferences = z.infer<typeof preferencesSchema>;
 
 const DEFAULT_PREFERENCES: Preferences = {
   model: "htdemucs",
-  targetStem: null,
+  twoStems: null,
   method: "add",
   shifts: 1,
 };