refactor(core): use custom scrollbar for editor and adjust shared page style (#5752)

Close TOV-481
- Use a custom scrollbar component for editor
- Modified the header of the share page and added a new footer

tests/affine-cloud/e2e/collaboration.spec.ts

@@ -112,10 +112,8 @@ test('share page with default edgeless', async ({ page, browser }) => {
     expect(await page2.textContent('affine-paragraph')).toContain(
       'TEST CONTENT'
     );
-    const logo = page2.getByTestId('share-page-logo');
     const editButton = page2.getByTestId('share-page-edit-button');
     await expect(editButton).not.toBeVisible();
-    await expect(logo).toBeVisible();
   }
 });