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/ship-wheel.mjs

@@ -0,0 +1,25 @@
+/**
+ * @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 = [
+  ["circle", { cx: "12", cy: "12", r: "8", key: "46899m" }],
+  ["path", { d: "M12 2v7.5", key: "1e5rl5" }],
+  ["path", { d: "m19 5-5.23 5.23", key: "1ezxxf" }],
+  ["path", { d: "M22 12h-7.5", key: "le1719" }],
+  ["path", { d: "m19 19-5.23-5.23", key: "p3fmgn" }],
+  ["path", { d: "M12 14.5V22", key: "dgcmos" }],
+  ["path", { d: "M10.23 13.77 5 19", key: "qwopd4" }],
+  ["path", { d: "M9.5 12H2", key: "r7bup8" }],
+  ["path", { d: "M10.23 10.23 5 5", key: "k2y7lj" }],
+  ["circle", { cx: "12", cy: "12", r: "2.5", key: "ix0uyj" }]
+];
+const ShipWheel = createLucideIcon("ship-wheel", __iconNode);
+
+export { __iconNode, ShipWheel as default };
+//# sourceMappingURL=ship-wheel.mjs.map