## What & why
A single, consistent **workspace-creation step** for both
multi-workspace and single-workspace self-host — collecting **name +
logo** (and the **subdomain** in multi-workspace) — which **removes the
duplicate name/logo prompt** that previously reappeared on the workspace
subdomain (reported after #21641).
## Changes
**One creation form for both modes**
- With 0 workspaces, both multi-workspace and single-workspace route to
the shared `SignInUpWorkspaceCreationForm`; `SignInUp` renders it for
the `WorkspaceCreation` step regardless of domain/scope.
- The subdomain field shows only in multi-workspace; single-workspace
keeps its fixed address.
**Logo on the creation step**
- New scoped `uploadNewWorkspaceLogo(workspaceId, file)` mutation: the
creator sets a logo on their just-created `PENDING_CREATION` workspace
via the workspace-agnostic token (membership enforced — only the creator
is a member at that point), reusing `uploadWorkspacePicture`. Upload
size is capped via `settings.storage.maxFileSize` (also applied to the
existing logo / profile-picture uploads).
- The picked file is held locally (object-URL preview, revoked on
unmount) and uploaded right after creation (non-fatal on failure).
**Onboarding step → pure activation loader**
- The old "Create your workspace" form (name + logo) is removed. The
onboarding step now activates the pending workspace on mount and shows
the loader, with a **Retry** action on failure.
## Testing
- typecheck (front + server) ✅; oxlint + oxfmt clean on changed files ✅
- Unit tests: `auth.resolver.spec`, `useWorkspaceSubdomainField`,
`SignInUpWorkspaceCreationForm` (multi + single-workspace), `useAuth` ✅
- Metadata GraphQL + `twenty-client-sdk` schema regenerated.
Follow-up to #21641.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
https://claude.ai/code/session_01Xw37hR5seiCyWnppG9z4op
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Félix Malfait
6a1b28bc12