Fix deletion of loft caps

[pierremtb]

Closes #10720

[vercel]

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Project	Deployment	Actions	Updated (UTC)
modeling-app	Ready	Preview, Comment	Apr 7, 2026 5:54pm

[max-mrgrsk]

so there are 3 bugs here:

• tagEnd is not working even in kcl
• code mod is tagging only tagStart what ever cap you are clicking
• code mod is using the original body on each delete instead of the name of it's last mutation

I have a gut feeling that second one is connected to the first and third bug is not critical problem so maybe the PR can be approved

reference to tagEnd problem: https://github.com/KittyCAD/engine/issues/4358#issuecomment-4173104911

tagEnd.mp4

[max-mrgrsk]

since it is a bigger issue, we can merge it as is and fix the rest over:

• https://github.com/KittyCAD/engine/issues/4358
• #10888