feat(publishers): make adding a ministry-school student a first-class flow

[mindsers]

Problem

There is no logical, easy way for an admin to add a ministry-school student (a current Member of the congregation who attends but isn't yet a declared publisher). Today:

1. /publishers/new is the only entry point on the Publishers screen, and the create service hardcodes isPublisher: true (app/features/publishers/server/create-member.server.ts:52). No toggle on the form.
2. The only way to end up with a non-publisher Member is to create them as a publisher, then demote them via a POST /publishers/:memberId/make-student action. But that action has no visible button on the publisher detail page — the lifecycle icon cluster only shows mark-as-left when the member is a publisher. The route exists and is reachable from the Settings → Users list and from e2e tests, but a normal user can't find it from the publisher view.
3. The one place that exposes a clear isPublisher checkbox in the UI is app/features/settings/routes/users/add-to-congregation.tsx, which only fires when a UserAccount exists but isn't yet linked to a Member — a niche admin flow (e.g. a circuit overseer login becoming a local member), not the common case.

Underlying mismatch: the domain has two independent axes — Type (publisher / student) and Lifecycle (present / inactive / left / anonymized) — but the UI presents one axis. The list is also labelled "Publishers" even though it already contains both publishers and ministry-school students (see docs/product/publishers.md).

Idea (not decided — needs more design work)

The shape of the redesign we've been kicking around:

• Rename the section "Membres" / "Members" to match what the list already contains. Keep the /publishers URL for now to avoid link/test churn.
• Single "Ajouter un membre" CTA, with a segmented control inside the form (Publisher / Ministry-school student, defaulting to Publisher). The choice would hide baptism date, anointed, the elder/servant nomination card, and the publisher type select for students; the group selector would stay visible.
• Move publisher ↔ student switching out of the lifecycle icon cluster into a dedicated "Status" card on the publisher view, with a single labelled action ("Convertir en étudiant" / "Déclarer proclamateur"). The lifecycle cluster would keep only inactive / mark-as-left / mark-as-returned — cleaner separation between "type of member" and "lifecycle state".
• createMember would accept isPublisher: boolean and force-zero baptism-gated flags when the kind is student, so DB CHECK constraints (servant/elder/anointed → baptism + male) can't be violated by construction.

Out of scope (current thinking)

• Renaming the /publishers URL — link rot, e2e tests, deep-links from territories. Sidebar/in-page copy rename only.
• Per-kind limits (students vs publishers). The existing members limit already covers both.
• Renaming audit actions (PublisherCreated, PublisherStatusChanged). Historical analytics rely on them.
• A list-row "convert" shortcut. Forcing the admin into the profile first is the right friction.

Status

Not decided. The above is one direction, not a committed design. Open questions before this is ready to implement:

• Is "segmented control inside the form" the right entry-point shape, or is a split button / two CTAs / a separate route preferable?
• Should the section actually be renamed, or should the label stay "Publishers" and the IA be fixed elsewhere?
• Where exactly does the publisher↔student action live on the profile (dedicated card vs. a settings-style menu vs. somewhere else)?
• Confirm-dialog copy (FR + EN) needs review before it ships.
• Are there flows we're forgetting — e.g. bulk import, archive restore — that would also need a "kind" field?

More design work needed before opening a PR. Feedback welcome.

[mindsers]

Progress since the issue was opened:

• The make-student / make-publisher / mark-as-left / mark-as-returned / mark-as-active / mark-as-inactive route actions all exist under app/features/publishers/routes/ and are exposed on the publisher detail page (publisher.tsx:153).
• Lifecycle transitions go through memberAggregate in app/features/publishers/server/member.aggregate.ts, which enforces the CHECK-constraint invariants (baptism/male gates on servant/elder/anointed) on writes.

Still not done — the two design bets in the issue:

• createMember still hardcodes isPublisher: true in member.aggregate.ts:61; the MemberIdentity form fields (member-identity.ts:60-73) don't expose an isPublisher choice.
• The new-member form has no segmented control / kind selector — the only entry point is still "add publisher".
• The section is still labelled Publishers (URL + sidebar).

Leaving open. The next move is the design call (segmented control vs. split CTA vs. dedicated route) — the plumbing is ready once the shape is decided.