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/egg-off.mjs

@@ -0,0 +1,18 @@
+/**
+ * @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 2 20 20", key: "1ooewy" }],
+  ["path", { d: "M20 14.347V14c0-6-4-12-8-12-1.078 0-2.157.436-3.157 1.19", key: "13g2jy" }],
+  ["path", { d: "M6.206 6.21C4.871 8.4 4 11.2 4 14a8 8 0 0 0 14.568 4.568", key: "1581id" }]
+];
+const EggOff = createLucideIcon("egg-off", __iconNode);
+
+export { __iconNode, EggOff as default };
+//# sourceMappingURL=egg-off.mjs.map