fix: restore lose chat focus on escape

[lorenzo-ranciaffi]

Pull Request Description

Fixes #5718

What does this PR change?

This PR restores the logic for losing chat focus when while typing, the user presses the escape button as it was in this PR.
Probably this code portion was lost because of merge conflicts during the multiple refactors that have been made with chat and voice chat.

Test Instructions

Test Steps

1. Verify that the steps described in the linked issue are now fixed

Quality Checklist

• Changes have been tested locally
• Documentation has been updated (if required)
• Performance impact has been considered
• For SDK features: Test scene is included

Code Review Reference

Please review our Code Review Standards before submitting.

[github-actions]

Windows and Mac build successful in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	96d4768
Logs	https://github.com/decentraland/unity-explorer/actions/runs/18342123737
Download Windows	https://github.com/decentraland/unity-explorer/suites/47166153675/artifacts/4214179159
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/5718-lose-chat-focus-on-escape/pr-14733-96d4768/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/47166153675/artifacts/4214009715
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/5718-lose-chat-focus-on-escape/pr-14733-96d4768/Decentraland_macos.zip
Built on	2025-10-08T11:31:01Z

[Ludmilafantaniella]

✅ QA Approved
Tested on Windows and Mac.
The chat input now correctly loses focus when pressing ESC, restoring the expected behavior.
All related functionality works as intended — shortcuts and chat interactions behave normally.

5721-fixevi.mp4