fix: resolve ambiguous '추가' button in E2E tests (#917)

adminfront/src/features/users/UserCreatePage.tsx

@@ -662,6 +662,7 @@ function UserCreatePage() {
                     variant="ghost"
                     size="sm"
                     className="absolute right-1 top-1 h-8 text-xs font-bold"
+                    data-testid="add-sub-email-btn"
                     onClick={() => {
                       const value = newSubEmail.trim().replace(/,/g, "");
                       if (
@@ -678,8 +679,7 @@ function UserCreatePage() {
                     }}
                   >
                     {t("ui.common.add", "추가")}
-                  </Button>
-                </div>
+                  </Button>                </div>
                 <p className="text-[10px] text-muted-foreground mt-1">
                   * 여러 개 입력 가능. 입력 후 엔터를 눌러 추가하세요.
                 </p>
@@ -877,6 +877,7 @@ function UserCreatePage() {
                       variant="outline"
                       size="sm"
                       onClick={addAppointment}
+                      data-testid="add-appointment-btn"
                     >
                       <Plus className="mr-2 h-4 w-4" />
                       {t("ui.common.add", "추가")}

adminfront/src/features/users/UserDetailPage.tsx

@@ -1176,6 +1176,7 @@ function UserDetailPage() {
                           variant="ghost"
                           size="sm"
                           className="absolute right-1 top-1 h-9 text-xs font-bold"
+                          data-testid="add-sub-email-btn"
                           onClick={() => {
                             const value = newSubEmail.trim().replace(/,/g, "");
                             if (
@@ -1329,6 +1330,7 @@ function UserDetailPage() {
                             variant="outline"
                             size="sm"
                             onClick={addAppointment}
+                            data-testid="add-appointment-btn"
                           >
                             <Plus className="mr-2 h-4 w-4" />
                             {t("ui.common.add", "추가")}

adminfront/tests/users.spec.ts

@@ -721,7 +721,7 @@ test.describe("User Management", () => {
     await expect(page.locator("input#department")).toHaveCount(0);
 
     await expect(page.getByText(/대표 소속/i)).toHaveCount(0);
-    await page.getByRole("button", { name: /^추가$/i }).click();
+    await page.getByTestId("add-appointment-btn").click();
     await expect(page.getByTestId("appointment-row-0")).toBeVisible();
     await expect(
       page.getByTestId("appointment-tenant-owner-line-0"),