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/device.rs

@@ -16,6 +16,9 @@ pub struct Device {
     pub name: String,
     #[schema(schema_with = super::nullable_int, required = true)]
     pub app_version_code: Option<i64>,
+    /// The app's `versionName` from `X-Kvitt-App-Version-Name` (schema 3); null until a request carried it.
+    #[schema(required = true)]
+    pub app_version_name: Option<String>,
     #[schema(value_type = TimestampSchema)]
     pub created_at: String,
     #[schema(value_type = TimestampSchema)]