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/croissant.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: "M10.2 18H4.774a1.5 1.5 0 0 1-1.352-.97 11 11 0 0 1 .132-6.487", key: "14kkz9" }],
+  ["path", { d: "M18 10.2V4.774a1.5 1.5 0 0 0-.97-1.352 11 11 0 0 0-6.486.132", key: "1g7v07" }],
+  ["path", { d: "M18 5a4 3 0 0 1 4 3 2 2 0 0 1-2 2 10 10 0 0 0-5.139 1.42", key: "ratg6b" }],
+  ["path", { d: "M5 18a3 4 0 0 0 3 4 2 2 0 0 0 2-2 10 10 0 0 1 1.42-5.14", key: "4454f0" }],
+  [
+    "path",
+    {
+      d: "M8.709 2.554a10 10 0 0 0-6.155 6.155 1.5 1.5 0 0 0 .676 1.626l9.807 5.42a2 2 0 0 0 2.718-2.718l-5.42-9.807a1.5 1.5 0 0 0-1.626-.676",
+      key: "qmemie"
+    }
+  ]
+];
+const Croissant = createLucideIcon("croissant", __iconNode);
+
+export { __iconNode, Croissant as default };
+//# sourceMappingURL=croissant.mjs.map