Phase 3: Hire wizard, draft resume, and two real SQL bugfixes

- components/hire/: 4-step Hire Wizard (Person/Position/Vertrag/
  Zusammenfassung) matching sec4.4, with a HireWizardProvider context so it
  can be opened both from the global "+ Neueinstellung" button and from a
  "Fortsetzen" link on a saved draft.
- actions/hireDrafts.ts: save/delete hire_drafts (owner-scoped RLS already
  in place from Phase 1). Dashboard now shows the "Entwuerfe" card the
  Phase 1 plan deferred, since the wizard it depends on now exists.
- lib/positions.ts: shared open-positions loader (position number, org
  breadcrumb, resolved manager name) used by both the wizard and (later)
  the Positions page.

Two real bugs found via live testing and fixed in supabase/functions.sql:
1. hire_employee/rehire_employee: a two-branch CASE returning bare string
   literals defaults to `text`, not the target enum, so `status = case
   when ... then 'Geplant' else 'Aktiv' end` failed against the
   employment_status column. Fixed with an explicit ::employment_status
   cast on the whole CASE expression.
2. Postgres precedence gotcha: ->> and || sit at the *same* precedence
   tier and left-associate, so `payload->>'first_name' || ' ' ||
   payload->>'last_name'` does not group the way it reads - it tries to
   apply ->> to an intermediate text value and fails with "operator does
   not exist: text ->> unknown". Fixed by parenthesizing every ->>'...'
   expression that participates in a || chain.

Also fixed: hire_employee referenced v_position.title outside the branch
that assigns v_position, raising "record not assigned" whenever a hire
wasn't tied to a position_id; extracted a v_job_title variable instead.

Verified live end-to-end: wizard search -> select position -> submit
creates the employee, closes the position, and writes matching
employee_history + audit_log rows atomically.

components/dashboard/DraftsCard.tsx

@@ -0,0 +1,67 @@
+"use client";
+
+import { Trash2 } from "lucide-react";
+import { useRouter } from "next/navigation";
+import { useTransition } from "react";
+import { deleteHireDraft } from "@/actions/hireDrafts";
+import { useHireWizard } from "@/components/hire/HireWizardContext";
+import { useToast } from "@/components/ui/Toast";
+import { fmtDate } from "@/lib/format";
+
+type Draft = { id: string; step: number; payload: Record<string, unknown>; updated_at: string };
+
+export function DraftsCard({ drafts }: { drafts: Draft[] }) {
+  const { openWizard } = useHireWizard();
+  const { showToast } = useToast();
+  const router = useRouter();
+  const [pending, startTransition] = useTransition();
+
+  if (drafts.length === 0) return null;
+
+  function handleDelete(id: string) {
+    startTransition(async () => {
+      const result = await deleteHireDraft(id);
+      if (result.success) {
+        showToast("Entwurf gelöscht.");
+        router.refresh();
+      } else {
+        showToast(result.error ?? "Fehler beim Löschen.", "error");
+      }
+    });
+  }
+
+  return (
+    <div className="rounded border border-border bg-white p-4">
+      <h2 className="mb-3 text-sm font-bold text-ink">Entwürfe – Neueinstellungen</h2>
+      <ul className="flex flex-col divide-y divide-border">
+        {drafts.map((d) => {
+          const firstName = typeof d.payload.firstName === "string" ? d.payload.firstName : "";
+          const lastName = typeof d.payload.lastName === "string" ? d.payload.lastName : "";
+          const name = [firstName, lastName].filter(Boolean).join(" ") || "Ohne Namen";
+          return (
+            <li key={d.id} className="flex items-center justify-between py-2 text-sm">
+              <div>
+                <span className="font-semibold text-ink">{name}</span>
+                <span className="ml-2 text-xs text-ink-muted">Gespeichert am {fmtDate(d.updated_at)}</span>
+              </div>
+              <div className="flex items-center gap-3">
+                <button type="button" onClick={() => openWizard(d.id)} className="text-xs font-semibold text-brand-700 hover:underline">
+                  Fortsetzen
+                </button>
+                <button
+                  type="button"
+                  onClick={() => handleDelete(d.id)}
+                  disabled={pending}
+                  aria-label="Entwurf löschen"
+                  className="text-ink-muted hover:text-danger-solid"
+                >
+                  <Trash2 className="h-4 w-4" />
+                </button>
+              </div>
+            </li>
+          );
+        })}
+      </ul>
+    </div>
+  );
+}