Fix selection on click in color area

[bjarnef]

Description

Fixes regression made in PR #1001 and metioned here: #1001 (comment)

Noticed in Chrome Version 135.0.7049.96 / Win 10 Pro.

In Chrome the click event returns MouseEvent, so it went to else statement and stopped executing the onMove() event.

It may be a bug that Firefox return PointerEvent as click is a MouseEvent:
https://stackoverflow.com/a/76900433

I can reproduce to issue in Firefox as well, so it may only be an issue click returning PointerEvent in older versions of Firefox and Safari as these has been resolved:
https://bugzilla.mozilla.org/show_bug.cgi?id=1675847
https://bugs.webkit.org/show_bug.cgi?id=218665

However it is safe casting to MouseEvent as PointerEvent inherits from this:
https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)

Motivation and context

How to test?

Screenshots (if appropriate)

Checklist

• If my change requires a change to the documentation, I have updated the documentation in this pull request.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[github-actions]

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[Copilot]

Pull Request Overview

This PR fixes a regression in the color area selection by addressing the event type check for click events in Chrome.

• Changed event check from PointerEvent to MouseEvent to account for browsers that return PointerEvent as MouseEvent.
• Added a clarifying comment about browser behavior regarding event types.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud