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/user-cog.mjs

@@ -0,0 +1,26 @@
+/**
+ * @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: "M10 15H6a4 4 0 0 0-4 4v2", key: "1nfge6" }],
+  ["path", { d: "m14.305 16.53.923-.382", key: "1itpsq" }],
+  ["path", { d: "m15.228 13.852-.923-.383", key: "eplpkm" }],
+  ["path", { d: "m16.852 12.228-.383-.923", key: "13v3q0" }],
+  ["path", { d: "m16.852 17.772-.383.924", key: "1i8mnm" }],
+  ["path", { d: "m19.148 12.228.383-.923", key: "1q8j1v" }],
+  ["path", { d: "m19.53 18.696-.382-.924", key: "vk1qj3" }],
+  ["path", { d: "m20.772 13.852.924-.383", key: "n880s0" }],
+  ["path", { d: "m20.772 16.148.924.383", key: "1g6xey" }],
+  ["circle", { cx: "18", cy: "15", r: "3", key: "gjjjvw" }],
+  ["circle", { cx: "9", cy: "7", r: "4", key: "nufk8" }]
+];
+const UserCog = createLucideIcon("user-cog", __iconNode);
+
+export { __iconNode, UserCog as default };
+//# sourceMappingURL=user-cog.mjs.map