✅(frontend) enhance document grid tests and component interactions

- Updated test cases to replace 'docs-grid-loader' with 'grid-loader'
for improved consistency across document grid tests.
- Refactored document interaction tests to utilize the 'docs-grid'
locator for better readability and maintainability.
- Enhanced document table content tests by refining element selection
methods for improved clarity and performance.
- Cleaned up test code to ensure better structure and maintainability.

src/frontend/apps/e2e/__tests__/app-impress/doc-version.spec.ts

@@ -32,11 +32,9 @@ test.describe('Doc Version', () => {
 
     const editor = page.locator('.ProseMirror');
     await modal.getByRole('button', { name: 'close' }).click();
-    await editor.locator('.bn-block-outer').last().fill('/');
-    await page.getByText('Heading 1').click();
+    await editor.click();
+    await page.keyboard.type('# Hello World');
 
-    await page.locator('.ProseMirror.bn-editor').click();
-    await page.locator('.ProseMirror.bn-editor').last().fill('Hello World');
     await goToGridDoc(page, {
       title: randomDoc,
     });