Ask for a residence permit only where one is needed

Employees from outside the EU, the EEA and Switzerland need a residence
permit, and HR needs to know when it expires — about eighty people in
the current data, across Türkei, Serbien and Bosnien. Two columns, the
same shape as the dismissal protection: a flag and a date that only
means anything with it. The date is optional, because an open-ended
permit has none and a mandatory field would force an invented one.

The nationality coupling deliberately stays out of the database. Putting
it there would mean keeping the country list in two places — SQL and
lib/countries.ts, where the picker needs it anyway — so an EU accession
would become a migration instead of a line in a list. Worse, correcting
somebody's nationality would fail the constraint while the old permit
was still attached, which is exactly the moment someone is fixing a
mistake. The UI decides whether the fields appear, and clears them when
the nationality moves into the free-movement area.

So the list is the load-bearing part, and it is tested: 31 entries, all
of them values the picker can actually produce, no duplicates, no third
countries. A missing nationality reads as "no permit required" — an
unanswered question is a reason to record it, not to demand papers.

The permit shows on the Stammdaten tab only for the nationalities it
applies to. A line reading "Aufenthaltstitel: Nein" under an Austrian
citizenship would look like information rather than a question that does
not arise.

Filter by it and by when it expires — the question behind that being
"whose permit runs out next quarter" — plus columns in the export.

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

components/employees/tabs/StammdatenTab.tsx

@@ -1,4 +1,5 @@
 import { AngehoerigeSection } from "@/components/employees/AngehoerigeSection";
+import { brauchtAufenthaltstitel } from "@/lib/countries";
 import { fmtAge, fmtDate } from "@/lib/format";
 import type { Database } from "@/lib/supabase/types";
 
@@ -31,6 +32,21 @@ export function StammdatenTab({ employee, location, dependents }: { employee: Em
     ["Geburtsdatum", `${fmtDate(employee.birth_date)} (${fmtAge(employee.birth_date)} Jahre)`],
     ["SV-Nummer", employee.sv_nummer ?? "–"],
     ["Staatsbürgerschaft", employee.nationality],
+    // Nur, wo er verlangt ist. Bei einer österreichischen Staatsbürger-
+    // schaft wäre die Zeile „Aufenthaltstitel: Nein" keine Auskunft,
+    // sondern eine Frage, die sich nicht stellt.
+    ...(brauchtAufenthaltstitel(employee.nationality)
+      ? ([
+          [
+            "Aufenthaltstitel",
+            employee.hat_aufenthaltstitel
+              ? employee.aufenthaltstitel_bis
+                ? `Ja, bis ${fmtDate(employee.aufenthaltstitel_bis)}`
+                : "Ja (unbefristet oder nicht erfasst)"
+              : "Nein",
+          ],
+        ] as [string, string][])
+      : []),
     ["Adresse", employee.address ?? "–"],
     ["Postleitzahl", employee.postal_code ?? "–"],
     ["Ort", employee.city ?? "–"],