feat(astro): add copy button for stack trace in error overlay

[dev-shetty]

Changes

• This PR adds a button to copy the stack trace, which makes it easier to add to any LLM or AI editor for easier debugging. More here Discussion #1234
• There is a subtle animation to give feedback that the stack is copied

Video of the Implementation

Screen.Recording.2025-10-04.at.2.14.21.PM.mov

Testing

I ran pnpm test:e2e:match "error|overlay", all the 18 test cases passed

Test case screenshot

Docs

It is a small UI addition to the error overlay, so i believe no docs are needed

[changeset-bot]

🦋 Changeset detected

Latest commit: 22b180d

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

This PR is blocked because it contains a major changeset. A reviewer will merge this at the next release if approved.

[codspeed-hq]

CodSpeed Performance Report

Merging #14489 will not alter performance

_{Comparing dev-shetty:feat-stacktrace-copy (22b180d) with main (62ec8ea)¹}

Summary

✅ 6 untouched

Footnotes

1. No successful run was found on main (4632db3) during the generation of this report, so 62ec8ea was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[florian-lefebvre]

Looks pretty good! Do you think you could add an e2e test for it?

Not a major

[dev-shetty]

Thanks for the review!

Never wrote e2e tests, but a good opportunity to learn.

Will add it.

[github-actions]

This PR is blocked because it contains a minor changeset. A reviewer will merge this at the next release if approved.

[dev-shetty]

@florian-lefebvre, added e2e test to check the copy functionality, and also the button interaction

Video showing the e2e test

Screen.Recording.2025-10-07.at.12.38.17.AM.mov

All the tests are passing

e2e test logs

[dev-shetty]

Thanks for the review!

@florian-lefebvre made the test case use getErrorOverlayContent(page). You can have a look

[florian-lefebvre]

Thanks looks good! We may be slow to merge it as we're currently at ViteConf

[dev-shetty]

Sure, no problem.

Enjoy your time there! ♥️

[Princesseuh]

Looks great, awesome work!

[sarah11918]

Changeset approved by docs! 🎉

[dev-shetty]

@florian-lefebvre are we good to merge this? ^^

[florian-lefebvre]

Yes! It's going to be part of 5.15, to be merged in the coming days

[dev-shetty]

Awesome! Thanks 🙌🏻

merge day