feat: overhaul linear onboarding wizard.

[qstearns]

Draft to base some work off on a UX overhaul

---

Summary by cubic

Replaces the linear onboarding wizard with an onboarding board so setup tasks can be tracked, assigned, and reminded about instead of completed step by step.

What changed

• The setup route now shows tasks as cards in To Do, In Progress, Awaiting Support, and Done columns, with drag-and-drop between columns.
• Each card opens the original setup step in a dialog; completing the step marks the task done, and server-verified tasks stay pinned to Done.
• Tasks can be assigned to a team member or an outside email, and board state is saved per organization in localStorage, so assignments are not yet shared with the rest of the team.
• Platform admins can hide tasks from the board and toggle hidden tasks back on.
• Reminders are currently stubbed; sending one records the last reminded time and shows a toast.
• ?task= deep links open a specific task dialog, which reminder emails can point at.

Dev server

• The mock WorkOS portal now only reports SSO and directory sync as configured after its "Complete setup" flow, so local onboarding shows the same unconfigured → configured transition as production.
• Completion state lives in memory and resets when dev-idp restarts.

^{Written for commit 8b25578. Summary will update on new commits.}

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8b25578

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR