app_sso_service_account is a marker group: membership hides an account
from the Users page's People tab entirely (users.ejs filters it out),
which is exactly right for a non-person account but has no guardrail
against adding a real person by mistake -- which just happened in
production (see #113) and looked exactly like the account had vanished.
Adding a member to any other group via this dropdown is unchanged
(fires immediately, no confirmation); only app_sso_service_account now
asks first, via app.messages.confirm.
Verified live against a local stack: confirmation shows the right
warning, Cancel leaves the group untouched, Confirm adds the member
normally, and every other group's add-member flow is unaffected.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
wmantlyandClaude Sonnet 5
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