fix: create SCIM token dialog closing prematurely

[rohan-chaturvedi]

Summary

Fixes a bug where creating the first SCIM token caused the create-token dialog to close instantly, hiding the token before the user could copy it.

Root cause

SCIMPage rendered two separate CreateSCIMTokenDialog instances — one in the section header (shown when tokens exist), and a duplicate inside the EmptyState (shown only when tokens.length === 0). Creating the first token triggered a refetch that flipped the count from 0 → 1, unmounting the EmptyState branch and tearing down the open dialog along with its createdToken state. On the second attempt, the persistent header dialog was used, so the token displayed correctly.

Fix

• Convert CreateSCIMTokenDialog to a forwardRef component exposing openModal/closeModal via useImperativeHandle, with no built-in trigger button.
• Mount a single dialog instance at the page level, owned by createTokenDialogRef.
• Render trigger buttons in both the header and the empty state; both call createTokenDialogRef.current?.openModal() on the same persistent dialog.

The dialog now survives the 0 → 1 token transition, so the newly created token stays visible and copyable.

Preview

Before

Screencast.From.2026-06-01.21-00-13.mp4

After

Screencast.From.2026-06-01.21-13-48.mp4

Review Focus

• With zero SCIM tokens, click the empty-state "Create token" button → dialog opens.
• Submit the form → token is created, dialog stays open and shows the token with a copy button.
• Click "Done" → dialog closes, token appears in the credentials table.
• With one or more tokens, click the header "Create token" button → dialog still works end-to-end.
• Verify the empty-state button is hidden for users without SCIM:update permission.