Fix: Arrow labels can be truncated when exporting

[Slowhand0309]

This PR fixes an issue where shapes containing labeled arrows could be truncated when exported.
Fixes #5224.

A patch has been applied to the SVG export process to address this.
If this approach does not meet expectations, please feel free to close this PR.

before	after

Change type

• bugfix
• improvement
• feature
• api
• other

Test plan

1. Exported shapes as PNG with arrow labels extending beyond their bounding box (as shown above) to confirm they were not cut off.
2. Also tested a case where the arrow label did not protrude.

• Unit tests
• End to end tests

Release notes

• Fixed an issue where shapes containing labeled arrows could be truncated when exported.

[vercel]

@Slowhand0309 is attempting to deploy a commit to the tldraw Team on Vercel.

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[mimecuvalo]

thx for the PR @Slowhand0309 !

@SomeHats you're the arrow expert, i think this looks good but could use your eye!

[SomeHats]

Thanks for the PR @Slowhand0309! We generally try really hard not to add this sort of per-shape special-casing to the editor (there are a few places in the codebase where it happens, but we're trying to reduce them over time!)

I've put up a PR with an alternative approach here that achieves the same sort of thing without the special casing.

[Slowhand0309]

@mimecuvalo @SomeHats
Thank you for your comment. I understand the direction. The alternative PR is great!