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/bed.mjs

@@ -0,0 +1,19 @@
+/**
+ * @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: "M2 4v16", key: "vw9hq8" }],
+  ["path", { d: "M2 8h18a2 2 0 0 1 2 2v10", key: "1dgv2r" }],
+  ["path", { d: "M2 17h20", key: "18nfp3" }],
+  ["path", { d: "M6 8v9", key: "1yriud" }]
+];
+const Bed = createLucideIcon("bed", __iconNode);
+
+export { __iconNode, Bed as default };
+//# sourceMappingURL=bed.mjs.map