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/goal.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: "M12 13V2l8 4-8 4", key: "5wlwwj" }],
+  ["path", { d: "M20.561 10.222a9 9 0 1 1-12.55-5.29", key: "1c0wjv" }],
+  ["path", { d: "M8.002 9.997a5 5 0 1 0 8.9 2.02", key: "gb1g7m" }]
+];
+const Goal = createLucideIcon("goal", __iconNode);
+
+export { __iconNode, Goal as default };
+//# sourceMappingURL=goal.mjs.map