Phase 2/3: Employees list/detail + mutation RPCs + action panels

- supabase/functions.sql, functions_2.sql: Postgres RPCs for every
  employee/position/reorg mutation (hire, terminate, transfer, promote,
  start/adjust/return karenz, change data, rehire, create position, staff
  internally, apply/undo reorg). Each resolves manager_id server-side,
  writes history + audit atomically, and enforces hr_admin via
  require_hr_admin() (backed by the existing RLS policy).
- actions/employees.ts, positions.ts, reorg.ts: Server Actions wrapping
  the RPCs, returning success/error for client-side toast handling.
- Employees list (search/filter/pagination) and detail (4 tabs: Stammdaten,
  Vertrag & Gehalt, Organisation, Historie) reading from employees_directory.
- 6 action slide-over panels: Transfer, Promote, Karenz (start/adjust/
  return), Daten aendern (person+contract diffing), Terminate (with direct-
  report reparenting warning + offboarding checklist), Rehire.
- lib/org.ts: shared division/department/team/location lookups.

Verified live: promote mutation updates salary, writes history/audit, and
the detail page reflects it after refresh, no console errors.

Note: the spec's Karenz-verwalten panel only covers employees already on
Karenz; added a start-Karenz mode (Karenzbeginn/geplante Rueckkehr) to
cover the Aktiv-employee case implied by the header button but not
specified in the panel list.

components/employees/panels/TerminatePanel.tsx

@@ -0,0 +1,116 @@
+"use client";
+
+import { useRouter } from "next/navigation";
+import { useState } from "react";
+import { terminateEmployee } from "@/actions/employees";
+import { SlideOver } from "@/components/ui/SlideOver";
+import { useToast } from "@/components/ui/Toast";
+import type { Database } from "@/lib/supabase/types";
+
+type EmployeeRow = Database["public"]["Views"]["employees_directory"]["Row"];
+
+const EXIT_REASONS = ["Einvernehmliche Auflösung", "Kündigung AN", "Kündigung AG", "Befristungsablauf", "Pensionierung", "Entlassung"];
+const CHECKLIST_ITEMS = ["IT-Zugänge deaktivieren", "Hardware retournieren", "ÖGK-Abmeldung", "Endabrechnung & Dienstzeugnis"];
+
+type TerminatePanelProps = {
+  open: boolean;
+  onClose: () => void;
+  employee: EmployeeRow;
+  directReportCount: number;
+};
+
+export function TerminatePanel({ open, onClose, employee, directReportCount }: TerminatePanelProps) {
+  const { showToast } = useToast();
+  const router = useRouter();
+  const [exitDate, setExitDate] = useState("");
+  const [reason, setReason] = useState(EXIT_REASONS[0]);
+  const [note, setNote] = useState("");
+  const [checked, setChecked] = useState<boolean[]>(CHECKLIST_ITEMS.map(() => false));
+  const [pending, setPending] = useState(false);
+
+  async function handleSubmit() {
+    if (!exitDate) {
+      showToast("Bitte ein Austrittsdatum angeben.", "error");
+      return;
+    }
+    setPending(true);
+    const result = await terminateEmployee({ employee_id: employee.id, exit_date: exitDate, exit_reason: reason, note });
+    setPending(false);
+    if (result.success) {
+      showToast(`Austritt für ${employee.first_name} ${employee.last_name} erfasst.`);
+      router.refresh();
+      onClose();
+    } else {
+      showToast(result.error ?? "Fehler beim Speichern.", "error");
+    }
+  }
+
+  return (
+    <SlideOver
+      open={open}
+      onClose={onClose}
+      title="Austritt"
+      subtitle={`${employee.first_name} ${employee.last_name} · ${employee.job_title}`}
+      footer={
+        <>
+          <button onClick={onClose} className="rounded px-4 py-2 text-sm font-semibold text-ink-body hover:bg-surface">
+            Abbrechen
+          </button>
+          <button
+            onClick={handleSubmit}
+            disabled={pending}
+            className="rounded bg-danger-solid px-4 py-2 text-sm font-semibold text-white disabled:opacity-50"
+          >
+            Austritt bestätigen
+          </button>
+        </>
+      }
+    >
+      <div className="flex flex-col gap-4">
+        {directReportCount > 0 && (
+          <div className="rounded bg-warning-bg px-3 py-2 text-sm text-warning-text">
+            {directReportCount} direkte Berichte werden automatisch der nächsthöheren Führungskraft zugeordnet.
+          </div>
+        )}
+        <div>
+          <label className="mb-1 block text-sm font-semibold text-ink">Austrittsdatum*</label>
+          <input
+            type="date"
+            value={exitDate}
+            onChange={(e) => setExitDate(e.target.value)}
+            className="w-full rounded border border-border px-3 py-2 text-sm"
+          />
+        </div>
+        <div>
+          <label className="mb-1 block text-sm font-semibold text-ink">Beendigungsart</label>
+          <select value={reason} onChange={(e) => setReason(e.target.value)} className="w-full rounded border border-border px-3 py-2 text-sm">
+            {EXIT_REASONS.map((r) => (
+              <option key={r} value={r}>
+                {r}
+              </option>
+            ))}
+          </select>
+        </div>
+        <div>
+          <label className="mb-1 block text-sm font-semibold text-ink">Anmerkung</label>
+          <textarea value={note} onChange={(e) => setNote(e.target.value)} rows={3} className="w-full rounded border border-border px-3 py-2 text-sm" />
+        </div>
+        <div>
+          <p className="mb-2 text-sm font-semibold text-ink">Offboarding-Checkliste</p>
+          <div className="flex flex-col gap-2">
+            {CHECKLIST_ITEMS.map((item, i) => (
+              <label key={item} className="flex items-center gap-2 text-sm text-ink-body">
+                <input
+                  type="checkbox"
+                  checked={checked[i]}
+                  onChange={(e) => setChecked((prev) => prev.map((c, idx) => (idx === i ? e.target.checked : c)))}
+                />
+                {item}
+              </label>
+            ))}
+          </div>
+        </div>
+      </div>
+    </SlideOver>
+  );
+}