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/waypoints.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: "m10.586 5.414-5.172 5.172", key: "4mc350" }],
+  ["path", { d: "m18.586 13.414-5.172 5.172", key: "8c96vv" }],
+  ["path", { d: "M6 12h12", key: "8npq4p" }],
+  ["circle", { cx: "12", cy: "20", r: "2", key: "144qzu" }],
+  ["circle", { cx: "12", cy: "4", r: "2", key: "muu5ef" }],
+  ["circle", { cx: "20", cy: "12", r: "2", key: "1xzzfp" }],
+  ["circle", { cx: "4", cy: "12", r: "2", key: "1hvhnz" }]
+];
+const Waypoints = createLucideIcon("waypoints", __iconNode);
+
+export { __iconNode, Waypoints as default };
+//# sourceMappingURL=waypoints.mjs.map