fix: handle boolean flag from MFE Config API in CourseImportHomePage

The ENABLE_COURSE_IMPORT_IN_LIBRARY flag check used strict string
comparison (=== 'true'), which fails when the value comes from the
MFE Config API at runtime (JSON boolean true instead of string 'true').
Use the same [true, 'true'].includes() pattern already in other library
components for this case.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mariajgrimaldi

src/library-authoring/import-course/CourseImportHomePage.test.tsx

@@ -1,3 +1,4 @@
+import { setConfig, getConfig } from '@edx/frontend-platform';
 import {
   initializeMocks,
   render as testRender,
@@ -53,4 +54,23 @@ describe('<CourseImportHomePage>', () => {
     expect(screen.queryByRole('heading', { name: 'Previous Imports' })).not.toBeInTheDocument();
     expect(screen.getByText('You have not imported any courses into this library.')).toBeInTheDocument();
   });
+
+  it('should show the import course button when flag is the string "true"', async () => {
+    setConfig({ ...getConfig(), ENABLE_COURSE_IMPORT_IN_LIBRARY: 'true' });
+    render(mockGetCourseImports.emptyLibraryId);
+    expect(await screen.findByRole('button', { name: /import course/i })).toBeInTheDocument();
+  });
+
+  it('should show the import course button when flag is the boolean true (MFE Config API)', async () => {
+    setConfig({ ...getConfig(), ENABLE_COURSE_IMPORT_IN_LIBRARY: true });
+    render(mockGetCourseImports.emptyLibraryId);
+    expect(await screen.findByRole('button', { name: /import course/i })).toBeInTheDocument();
+  });
+
+  it('should not show the import course button when flag is disabled', async () => {
+    setConfig({ ...getConfig(), ENABLE_COURSE_IMPORT_IN_LIBRARY: 'false' });
+    render(mockGetCourseImports.emptyLibraryId);
+    await screen.findByText('You have not imported any courses into this library.');
+    expect(screen.queryByRole('button', { name: /import course/i })).not.toBeInTheDocument();
+  });
 });

src/library-authoring/import-course/CourseImportHomePage.tsx

@@ -23,7 +23,7 @@ import messages from './messages';
 const ImportCourseButton = () => {
   const navigate = useNavigate();
 
-  if (getConfig().ENABLE_COURSE_IMPORT_IN_LIBRARY === 'true') {
+  if ([true, 'true'].includes(getConfig().ENABLE_COURSE_IMPORT_IN_LIBRARY)) {
     return (
       <Button iconBefore={Add} onClick={() => navigate('courses')}>
         <FormattedMessage {...messages.importCourseButton} />