supabase / supabase / 27211913461

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feat(studio): Issuer field in SSO form (#46187)

> [!CAUTION]
> This new SSO field is UI-only until `oidc_issuer` is added to the
`config` object.

## What kind of change does this PR introduce?

Feature

## What is the current behavior?

The SAML SSO provider config form has no way to supply an OIDC Issuer
URL, which is required for enterprise-managed MCP authentication.

## What is the new behavior?

- Adds an **OIDC Issuer URL** field to the SAML SSO provider config form
(`/org/_/sso`) inside an "Advanced settings" collapsible.
- Minor UI touch-ups to that SSO form.

| After |
| --- |
| <img width="1434" height="2458" alt="94962"
src="https://github.com/user-attachments/assets/e56f83cd-6e30-4a3f-a78d-330fc053953a"
/> |

The `oidcIssuer` field is UI-only right now; it renders but does not
write. Before merging:

1. Add `oidc_issuer` to the SSO config API type (removes the `as any`
cast in `SSOConfig.tsx:219`)
2. Add `oidc_issuer: values.oidcIssuer || undefined` to the `onSubmit`
payload at `SSOConfig.tsx:183`
3. Wire the backend endpoint to persist and return the field


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* SSO settings now include an "Advanced settings" collapsible with an
OIDC issuer field.

* **UX / Bug Fixes**
* Small UI/description refinements in SSO forms and attribute-mapping
layouts.

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---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Cemal Kilic <cemalkilic96@gmail.com>
Co-authored-by: Cemal Kılıç <cemalkilic@users.noreply.github.com>

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