Review ckeditor5 imports in the emoji package

[pomek]

Provide a description of the task

I found imports like this:

ckeditor5/packages/ckeditor5-emoji/src/ui/emojicategoriesview.ts

Lines 12 to 13 in c7a4dfa

	import { ButtonView, View, ViewCollection } from 'ckeditor5/src/ui.js';
	import { FocusTracker, KeystrokeHandler, type Locale } from 'ckeditor5/src/utils.js';

All imports should be done using the ckeditor5 package.

Let's review all ckeditor5 imports before the final merge.

[pomek]

Please, review CSS class names, too.