supabase / supabase / 22905633413 / 1 – studio-tests

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chore: add copy button to project reference custom domain flow, add n… (#43585)

…ote on subdomain

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Feature 

## What is the current behavior?

<img width="697" height="305" alt="CleanShot 2026-03-10 at 09 59 59"
src="https://github.com/user-attachments/assets/7105c136-bffc-49e3-afaf-e6f49a2d4f12"
/>

## What is the new behavior?
- The endpoint value in the CNAME setup instructions can now be copied
with a single click.
- Also adds a note clarifying that some DNS providers expect only the
subdomain label while others accept the full hostname.



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