[lexical-list] Bug Fix: Removed the hardcoded checkbox width in checklist onclick helper

[jvithlani]

Description

The checkbox onclick handler currently assumes the checkbox size to be 20px, which works for current scenarios as the checkbox doesnt grow with the font size.

instead of hardcoding the checkbox width, now we're using the calculated width of the checkbox

Test plan

Before

Screen.Recording.2025-05-22.at.11.12.57.AM.mov

After

Screen.Recording.2025-05-22.at.11.13.45.AM.mov

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 22, 2025 5:02am
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[jvithlani]

@etrepum i cant merge the PR, please help

[etrepum]

Approval runs additional tests, merging doesn't happen immediately or automatically. I'm going to wait to merge this one until #7558 is reviewed because I think it may solve this as well as some other issues and if it works well then that PR would be preferable.

[jvithlani]

Okay while his fixes for the size of the checkbox seem fine to me, changes in https://github.com/facebook/lexical/pull/7558/files#diff-983bb36964538460466250f740f52fa2bb1d6e7f3d650157748b5eae0159bff0
look over-engineered, hence i've raised this PR, once my PR is merged, those changes in that PR wont be needed.

Also i dont see extended tests running

[etrepum]

The extended checks have already run and passed. Sorry, I don't sit at my computer waiting for CI to pass so I can immediately merge changes.

[jvithlani]

Thanks, no i just saw few of them were skipped, apologies if it came out in a different way, i'm new to this