feat: make stem output the primary app choice

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

Author: hi-ogawa-agent

packages/app/e2e/model-files.spec.ts

@@ -31,6 +31,7 @@ test("coordinates individual model file slots", async ({ page }) => {
     page.getByTestId("model-file-slot").getByText("Ready"),
   ).toHaveCount(2);
 
+  await page.getByText("Advanced settings", { exact: true }).click();
   await page.locator("#model").selectOption("htdemucs_ft");
   await expect(page.getByTestId("model-file-slot")).toHaveCount(5);
   await expect(page.getByLabel("Select dft.bin").locator("..")).toContainText(

packages/app/e2e/preferences.spec.ts

@@ -15,7 +15,9 @@ test("restores and updates configuration preferences", async ({ page }) => {
   await page.goto("/");
 
   await expect(page.locator("#model")).toHaveValue("htdemucs_ft");
-  await expect(page.locator("#twoStems")).toHaveValue("bass");
+  await expect(
+    page.getByRole("radio", { name: /Bass \+ backing/ }),
+  ).toBeChecked();
   await expect(page.locator("#method")).toHaveValue("minus");
   await expect(page.locator("#method")).toBeEnabled();
   await expect(page.locator("#outputSummary")).toContainText(
@@ -24,7 +26,7 @@ test("restores and updates configuration preferences", async ({ page }) => {
   await expect(page.locator("#shifts")).toHaveValue("3");
   await expect(page.getByLabel("Select htdemucs_ft_bass.onnx")).toBeAttached();
 
-  await page.locator("#twoStems").selectOption("");
+  await page.getByRole("radio", { name: /Four stems/ }).check();
   await expect(page.locator("#method")).toBeDisabled();
   await expect(page.locator("#outputSummary")).toContainText(
     "Creates vocals.wav, drums.wav, bass.wav, and other.wav.",
@@ -35,3 +37,11 @@ test("restores and updates configuration preferences", async ({ page }) => {
     )
     .toContain('"twoStems":null');
 });
+
+test("uses the default output configuration", async ({ page }) => {
+  await page.goto("/");
+
+  await expect(page.getByRole("radio", { name: /Four stems/ })).toBeChecked();
+  await expect(page.locator("#method")).toHaveValue("minus");
+  await expect(page.locator("#method")).toBeDisabled();
+});