fix:taping on text field margin does'nt hide the keyboard

[mostafaemara]

Description

This Pull Request allow user to hide keyboard when click on the margin of the text field.

Dependency addition:

nothing

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

Related Issues

Closes #332

[Copilot]

Pull Request Overview

This PR enables dismissing the keyboard when the user taps on the margin around the text field.

• Wraps the text field container in a GestureDetector with onTap to unfocus the field.
• Applies textFieldConfig?.margin to the container.
• Adjusts indentation for readability.

Comments suppressed due to low confidence (1)

lib/src/widgets/chatui_textfield.dart:136

• No tests are provided to verify that tapping outside the TextField dismisses the keyboard. Consider adding a widget test that simulates a tap on the margin and asserts that the keyboard is hidden (e.g., FocusScope.of(context).hasPrimaryFocus is false).

onTap: () {

[Copilot]

[nitpick] Wrapping the entire text field container with GestureDetector and HitTestBehavior.opaque may intercept taps intended for the TextField, causing focus to be lost immediately when interacting with the field. Consider limiting the tap detection to only the margin area or placing the detector at a higher level (e.g., Scaffold) to avoid interfering with child input.