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/pocket-knife.mjs

@@ -0,0 +1,20 @@
+/**
+ * @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: "M3 2v1c0 1 2 1 2 2S3 6 3 7s2 1 2 2-2 1-2 2 2 1 2 2", key: "19w3oe" }],
+  ["path", { d: "M18 6h.01", key: "1v4wsw" }],
+  ["path", { d: "M6 18h.01", key: "uhywen" }],
+  ["path", { d: "M20.83 8.83a4 4 0 0 0-5.66-5.66l-12 12a4 4 0 1 0 5.66 5.66Z", key: "6fykxj" }],
+  ["path", { d: "M18 11.66V22a4 4 0 0 0 4-4V6", key: "1utzek" }]
+];
+const PocketKnife = createLucideIcon("pocket-knife", __iconNode);
+
+export { __iconNode, PocketKnife as default };
+//# sourceMappingURL=pocket-knife.mjs.map