SVNR validation, CI, and a dependency/security pass

Positions
- Removed the "Besetzen" action, the StaffInternallyModal behind it and the
  now-unreachable staffPositionInternally server action: a position is filled
  through the hire process, not from the positions list. Note that
  transfer_employee has no position_id at all and never touched `positions`,
  so with staff_position_internally out of the UI, hire_employee is the only
  thing that closes a position — a transfer into an open one leaves it open.
  The RPC itself is still in the database and still covered by its tests.

SVNR
- Austrian social security numbers are now validated: ten digits, weighted
  check digit mod 11, and the TTMMJJ tail cross-checked against birth_date,
  which is what catches a transposed date that a valid check digit would let
  through. A serial whose weighted sum lands on 11 is rejected rather than
  wrapped — those are never issued.
- Applies to Austrian locations only; the German/Czech/Slovenian equivalents
  have their own formats and stay free-form.
- Enforced by a trigger, not inside hire_employee/change_employee_data, for
  the same reason as the assignment history: both have been redefined by
  half a dozen migrations. Only a *newly written* value is checked, so a
  legacy number never blocks an unrelated transfer or address change.
- The seed drew a random four-digit prefix, so its check digit was right
  only by chance and every seeded Austrian row would now be rejected;
  it computes the check digit properly now.

Tech stack
- next 16.2.11 closes nine advisories against 16.2.10, including a
  middleware/proxy bypass in App Router apps on Turbopack — proxy.ts is this
  app's entry gate. RLS remains the real boundary, so the blast radius was a
  blank page rather than data, but it is a patch-level fix. Also react
  19.2.8, tailwind 4.3.3, lucide-react 1.26, supabase-js/ssr, postcss.
- CI runs lint, typecheck, schema/type drift, tests and build; a second job
  replays every migration onto an empty database and runs the integration
  suite against it, so a migration that cannot be replayed from scratch
  fails here instead of during a restore.
- scripts/check-schema-types.mjs diffs the hand-written lib/supabase/types.ts
  against the migrations. Reading the SQL rather than a live database keeps
  Postgres out of the fast CI job. Verified in both directions.
- vitest now runs two projects: node for logic, jsdom for components. The
  first component test covers the org chart expand control, which broke
  earlier this session when elementsSelectable={false} made React Flow
  compute pointer-events:none for the whole node; re-introducing that prop
  fails three of these tests.
- Content-Security-Policy is emitted report-only. Enforcing a policy derived
  from inspection rather than from violation reports risks blanking the app;
  'unsafe-inline' on script-src is required until a nonce is threaded through
  proxy.ts, which is a separate change.
- Fixed supabase/seed.ts, which this session's SVNR change had broken: the
  extensionless "../lib/svnr" import does not resolve under Node's ESM
  loader, so the seed failed at startup.
- engines pinned to node >=22 <25, tsconfig target ES2022, and the dead
  test:e2e script removed (no Playwright is installed).

components/hire/HireWizard.tsx

@@ -7,6 +7,7 @@ import { deleteHireDraft, saveHireDraft } from "@/actions/hireDrafts";
 import { Modal } from "@/components/ui/Modal";
 import { useToast } from "@/components/ui/Toast";
 import type { OpenPositionResolved } from "@/lib/positions";
+import { isValidSvnr, requiresAustrianSvnr } from "@/lib/svnr";
 import { StepPerson } from "./StepPerson";
 import { StepPosition } from "./StepPosition";
 import { StepSummary } from "./StepSummary";
@@ -48,8 +49,15 @@ export function HireWizard({ open, onClose, openPositions, locations, resumeDraf
     setDraft((prev) => ({ ...prev, ...patch }));
   }
 
+  // Blocks step 1 rather than letting the hire fail at the RPC: the SVNR
+  // trigger rejects a bad number, and by then the user is three steps on.
+  const svNummerOk =
+    !draft.svNummer.trim() ||
+    !requiresAustrianSvnr(locations.find((l) => l.id === draft.locationId)?.country) ||
+    isValidSvnr(draft.svNummer, draft.birthDate || null);
+
   const stepValid = [
-    Boolean(draft.firstName && draft.lastName && draft.birthDate && draft.locationId),
+    Boolean(draft.firstName && draft.lastName && draft.birthDate && draft.locationId) && svNummerOk,
     Boolean(draft.positionId && draft.besetzung),
     Boolean(draft.entryDate && draft.workDays.length > 0),
     true,

components/hire/StepPerson.tsx

@@ -1,3 +1,4 @@
+import { SvNummerField } from "@/components/employees/SvNummerField";
 import { TitleFields } from "@/components/employees/TitleFields";
 import type { HireDraftData } from "./types";
 
@@ -38,10 +39,12 @@ export function StepPerson({ draft, update, locations }: StepPersonProps) {
           <input type="date" value={draft.birthDate} onChange={(e) => update({ birthDate: e.target.value })} className="w-full rounded border border-border px-3 py-2 text-sm" />
         </div>
       </div>
-      <div>
-        <label className="mb-1 block text-sm font-semibold text-ink">SV-Nummer</label>
-        <input value={draft.svNummer} onChange={(e) => update({ svNummer: e.target.value })} className="w-full rounded border border-border px-3 py-2 text-sm" />
-      </div>
+      <SvNummerField
+        value={draft.svNummer}
+        onChange={(svNummer) => update({ svNummer })}
+        locationCountry={locations.find((l) => l.id === draft.locationId)?.country}
+        birthDate={draft.birthDate || null}
+      />
       <div className="grid grid-cols-1 gap-3 sm:grid-cols-2">
         <div>
           <label className="mb-1 block text-sm font-semibold text-ink">E-Mail (privat)</label>