fix(web): set album description textarea height correctly (#9880)

* fix(web): set description textarea content correctly

* Deduplicate description textarea

* Add strict types to function

* Add strict types to functions

* Add default parameter values

* Add tests covering AutogrowTextarea

* Add another test and lint the files

* Add a test, fix a typo

* Implement suggestions

* Remove use of $$restProp

web/src/lib/components/album-page/album-description.spec.ts

@@ -0,0 +1,18 @@
+import AlbumDescription from '$lib/components/album-page/album-description.svelte';
+import '@testing-library/jest-dom';
+import { render, screen } from '@testing-library/svelte';
+import { describe } from 'vitest';
+
+describe('AlbumDescription component', () => {
+  it('shows an AutogrowTextarea component when isOwned is true', () => {
+    render(AlbumDescription, { isOwned: true, id: '', description: '' });
+    const autogrowTextarea = screen.getByTestId('autogrow-textarea');
+    expect(autogrowTextarea).toBeInTheDocument();
+  });
+
+  it('does not show an AutogrowTextarea component when isOwned is false', () => {
+    render(AlbumDescription, { isOwned: false, id: '', description: '' });
+    const autogrowTextarea = screen.queryByTestId('autogrow-textarea');
+    expect(autogrowTextarea).not.toBeInTheDocument();
+  });
+});