[Splitter] Add support for touch events

[wherewhere]

Pull Request

📖 Description

Fix the split-panels element on touch device.

Before:

2025-11-20.131420.mp4

Now:

2025-11-20.131539.mp4

👩‍💻 Reviewer Notes

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new component
• I have modified an existing component
• I have validated the Unit Tests for an existing component