fix(GRO-213): resolve 3 type errors blocking CI

- setup.ts:73: cast result.code to 409 to satisfy ContentfulStatusCode
- SetupWizard.jsx: quote CSS rem value (2rem -> "2rem") — inline styles
  require strings for CSS units
- SetupWizard.js: rename to .jsx so Vite can parse JSX (QA requirement)
- App.tsx: update import to .jsx extension
- Add SetupWizard.d.ts type declaration for .jsx module resolution

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/routes/setup.ts

@@ -70,7 +70,7 @@ setupRouter.post("/", zValidator("json", setupSchema), async (c) => {
   });
 
   if ("error" in result) {
-    return c.json({ error: result.error }, result.code);
+    return c.json({ error: result.error }, result.code as 409);
   }
 
   return c.json({ ok: true, staff: result.staff }, 201);