💄(frontend) visual improvements around the Icon

With time some visual inconsistencies have crept
into the DropButton and Icon component.
This commit aims to harmonize the appearance
with the design system.

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

@@ -134,6 +134,8 @@ test.describe('Document grid item options', () => {
   test('it deletes the document', async ({ page, browserName }) => {
     const [docTitle] = await createDoc(page, `delete doc`, browserName);
 
+    await verifyDocName(page, docTitle);
+
     await page.goto('/');
 
     await expect(page.getByText(docTitle)).toBeVisible();