M12e: contract pass (pair invite kind, admin name in invite links, sync failed flag, rejection actor, device version name, template id, update check result, untouched accounts, D-027 re-stamp, PushEvent in :core:model, snackbar hosts)

Server: E-3 invite_kind; E-12 link ?from=<admin name>, E-4 passes it into kvitt://invite;
X-Kvitt-App-Version-Name stored in devices.app_version_name (migration 0003, schema 3);
OpenAPI and examples follow. Phone: :core:model, :core:fakes, :data, features and :app
updated together; goldens re-recorded for S-20 (version name) and new S-1/S-22 states.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

server/crates/kvitt-server/src/wire/invite.rs

@@ -51,10 +51,12 @@ pub struct AcceptInviteRequest {
     pub display_name: Option<String>,
 }
 
-/// E-3 response. The token is shown only here.
+/// E-3 response. The token is shown only here. `invite_kind` is the kind of the accepted invite, so the app shows
+/// the profile step (S-2) only after a `partner` pairing (AC-2.10).
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, ToSchema)]
 pub struct AcceptInviteResponse {
     pub token: String,
+    pub invite_kind: InviteKind,
     pub user: User,
     pub device: Device,
     pub household: Vec<User>,