Add sync error logging, extend error flash, fix unload saves

- Log workforce sync errors to backend stdout so they appear in docker logs
- Extend error flash from 5s to 15s so errors are readable
- Replace sendBeacon (POST-only) with keepalive fetch (PUT) on unload —
  sendBeacon was hitting 404s on all three unload saves

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/lucide-react/dist/esm/icons/scooter.mjs

@@ -0,0 +1,22 @@
+/**
+ * @license lucide-react v1.24.0 - ISC
+ *
+ * This source code is licensed under the ISC license.
+ * See the LICENSE file in the root directory of this source tree.
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const __iconNode = [
+  ["path", { d: "M21 4h-3.5l2 11.05", key: "1gktiw" }],
+  [
+    "path",
+    { d: "M6.95 17h5.142c.523 0 .95-.406 1.063-.916a6.5 6.5 0 0 1 5.345-5.009", key: "1bq3u3" }
+  ],
+  ["circle", { cx: "19.5", cy: "17.5", r: "2.5", key: "e4zhv9" }],
+  ["circle", { cx: "4.5", cy: "17.5", r: "2.5", key: "50vk4p" }]
+];
+const Scooter = createLucideIcon("scooter", __iconNode);
+
+export { __iconNode, Scooter as default };
+//# sourceMappingURL=scooter.mjs.map