Cornerstone Report: system values, not display names

Reworked against the load spec and the 27.09. test file. The values I
had guessed were the German display names, which is the first entry on
the list of errors from earlier loads: Cornerstone answers "ungültiger
Wert" and rejects the whole row, followed by "Alle abhängigen Felder
müssen gültig sein" as a follow-on.

  Status            Aktiv/Inaktiv    -> Active/Inactive
  Employment Status Arbeitend/...    -> Working/On Leave/Terminated
  User Type         Mitarbeiter      -> Employee
  Time Zone         CET              -> empty

The time zone is the second entry on that list: only a portal time zone
id is valid, an abbreviation gives "Zeitzonencode nicht eindeutig".
Empty means the portal or the OU decides.

Division ID is the GUID from the test file, not a name. Termination
fields and Leave Reason are filled only when the employment status
carries them -- a reason without a termination is an invalid state for
the load, not extra information.

Four fields now stay empty on purpose, because filling them would mean
inventing an identifier that belongs to the target system: Location ID
(locations has id/name/country and no Cornerstone id), Position ID (our
S-0001 is not a Cornerstone position), Months of Service (Cornerstone
derives it) and Rehired Employee (the value for "yes" is unconfirmed,
and an unconfirmed value costs the whole row). Retention Rules and
Organisationsstufe stay empty because the load ignores them.

Header and row now match the test file byte for byte, except User ID
(no TEST- prefix outside a test load), Required Training Approvals and
Location ID.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

components/reports/ReportsPageClient.tsx

@@ -659,10 +659,11 @@ export function ReportsPageClient(props: ReportsPageClientProps) {
 
         {mode === "snapshot" && (
           <div className="rounded border border-border bg-white p-4">
-            <h3 className="mb-1 text-xs font-semibold uppercase tracking-wide text-ink-muted">Cornerstone-Report</h3>
+            <h3 className="mb-1 text-xs font-semibold uppercase tracking-wide text-ink-muted">Cornerstone Report</h3>
             <p className="mb-1 text-xs text-ink-muted">
-              Die 57 Spalten des Cornerstone-Einlesens, Datum tagzuerst. Vier Felder tragen noch Platzhalter
-              (Division ID, Doxis, Interflex, LGVplus) und sind vor einem echten Lauf zu ersetzen.
+              Load-File für Cornerstone: 57 Spalten in der Reihenfolge der Vorlage, kommagetrennt, Datum
+              TT.MM.JJJJ, Systemwerte statt Anzeigenamen (Active, Working, Employee). Ohne Location ID und
+              Position ID — dafür fehlen die Kennungen des Zielsystems.
             </p>
             <p className="mb-2 rounded bg-surface px-2 py-1.5 text-xs font-semibold text-ink-body">Status im Export: {statusExportLabel}</p>
             <div className="flex gap-2">