describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Add documentation about integrating with Elementor widgets via JavaScript hooks to address missing guidance for widget customization.

Main changes:

• Added "Integrating with widgets" section explaining widget initialization limitations
• Provided code example showing how to customize Swiper widget parameters using window.onLoad event
• Clarified that Elementor Frontend doesn't trigger widget initialization events

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