🐛 [Bug]: Internal server error adding new product

[chr15m]

Bug Description

I started the server and added a new product. I clicked the "Add" button and it didn't appear to do anything. I clicked it again and then started getting this error. Here's a screenshot of the UI:

Log:

{"level":"info","ip":"127.0.0.1","latency":"881.549µs","status":200,"method":"POST","url":"/api/_/products","time":1722347820,"message":"Success"}
{"level":"error","caller":"/home/runner/work/litecart/litecart/internal/handlers/private/product.go:47","error":"constraint failed: UNIQUE constraint failed: product.slug (2067)","time":1722347823}

When I refreshed the page it turned out the product had already been crated.

How to Reproduce

1. Go to the UI to add a product.
2. Input some details and press "Save".
3. Press "Save" again when it doesn't save.
4. See the error.

Expected Behavior

If the product has been added I'd expect it to show up in the product list behind the form so it's clear it's already been added, and maybe a more informative error message telling me it's already been added. Maybe the button should be greyed out once clicked.

litecart Version

v0.1.12

Code Snippet (optional)

No response

Checklist:

• I agree to follow litecart's Code of Conduct.
• I have checked for existing issues that describe my problem prior to opening this one.
• I understand that improperly formatted bug reports may be closed without explanation.