Phase 2: scaffold Waiter PWA — React+Vite, PWA manifest, all pages and components

waiter_pwa/src/components/ConnectionBanner.jsx

@@ -0,0 +1,14 @@
+export default function ConnectionBanner() {
+  return (
+    <div style={{
+      background: '#7f1d1d',
+      color: '#fca5a5',
+      textAlign: 'center',
+      padding: '8px 16px',
+      fontSize: 13,
+      fontWeight: 600,
+    }}>
+      ⚠ Cannot reach the system — check your WiFi
+    </div>
+  )
+}