Make SSO Configuration UI more clear

[juliusgeo]

Description

1. make it such that the SSO configuration pane can be dismissed
2. add a warning when SSO is config'ed but no domains are set
3. remove domain list placeholder
4. remove dependency on posthog for showing SSO page

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Chore (changes which are not directly related to any business logic)

Checklist

Changes have been:

• Tested (unit, integration, or manually with steps specified)
• Linted and formatted
• Documented (where applicable)
• Added to CHANGELOG (where applicable) -- see Keep a Changelog

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🤖 AI Disclosure

• I acknowledge that an LLM was used in the creation of this Pull Request, in accordance with Hatchet's AI_POLICY.md.

• Details: Claude code, used to generate the frontend changes quickly.

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Project	Deployment	Actions	Updated (UTC)
hatchet-docs	Ready	Preview, Comment	May 20, 2026 4:26pm

[promptless-for-oss]

Promptless prepared a documentation update related to this change.

Triggered by PR #3971

Added documentation for the SSO domain verification workflow, explaining how to enable automatic SSO redirect for organization members by adding and verifying domains via DNS TXT records. This complements the UI clarifications in this PR.

Review: Document Enterprise SSO configuration