[fix] refine site url determination logic

[jinkang-0]

What's new in this PR

Description

• Refine the logic that determines the current site URL depending on the deployment environment
• This fix should fix issues with the reset password link leading to a private preview URL

How to review

The nature of the feature requires testing after production. The site URL is determined as "http://localhost:3000/" if it detects it is not deployed by Vercel. If it is deployed in a preview environment by Vercel, the site URL will be the preview URL. If it is deployed in production, it will use the production URL.

For a complete test, the forgot password email link should be tested after this PR is merged.

Relevant links

• Vercel's system environment variables

CC: @ethan-tam33

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Project	Deployment	Actions	Updated (UTC)
adopt-an-inmate	Ready	Preview, Comment	Mar 4, 2026 11:13pm

[InayaY3]

still doesn't work on the previews for me, but at least it doesn't redirect to the local link anymore. ik this was intended to fix for local testing + production testing, so i'm still okay to merge this in since it seems to be working for those. thoughts on what it could be?

(also tried again, still showed this screen but instead said the link was invalid or smt)

[jinkang-0]

still doesn't work on the previews for me, but at least it doesn't redirect to the local link anymore. ik this was intended to fix for local testing + production testing, so i'm still okay to merge this in since it seems to be working for those. thoughts on what it could be?

It's odd, I referenced the docs again and it mentioned to use the "PASSWORD_RECOVERY" event. However, I recall the events triggered were just "SIGNED_IN" or "INITIAL_SESSION"... It could've been that Supabase patched a bug or updated the functionality. I do remember the flow working before though.

Nonetheless, I think the functionality this PR is intended to do is to fix the site URL determination code, which seems to be working (at least for localhost and preview). We should investigate the forgot password flow deeper as a separate issue.