Submission Slug change modal instantly closes

[dd32]

As reported to plugins@:

Just a heads-up: while submitting a new plugin today, we noticed the "change" link for the slug field opens a modal that immediately closes before it can be used. We reproduced it in both Chrome and Safari.

We were able to work around it with a quick console command (setTimeout(() => { document.querySelector('dialog').showModal() }, 100)) but wanted to flag it in case it's not on your radar.

## Summary

Fixes Meta Trac #8205.

• The "change" link for the slug field on the plugin submission page used href="#" with an inline onclick to call showModal(), but the default href="#" navigation was not prevented, causing the dialog to close immediately after opening.
• Adds event.preventDefault() to the onclick handler to stop the hash navigation.

## Test plan

• [ ] Submit a plugin (or view a pending plugin with slug change enabled)
• [ ] Click the "change" link next to the assigned slug
• [ ] Verify the dialog opens and stays open
• [ ] Verify the dialog can be closed via the X button
• [ ] Verify slug change submission still works

🤖 Generated with ​Claude Code

[dd32]

In 14717:

Plugin Directory: Submission: Fix the slug change dialogue immediately closing.

Closes #8205, ​https://github.com/WordPress/wordpress.org/pull/562.

Merged in e2b170e.