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/star-minus.mjs

@@ -0,0 +1,23 @@
+/**
+ * @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: "M15 18h6", key: "3b3c90" }],
+  [
+    "path",
+    {
+      d: "M17.688 14a2.1 2.1 0 0 1 .416-.568l3.736-3.638a.53.53 0 0 0-.294-.905l-5.166-.755a2.1 2.1 0 0 1-1.595-1.16l-2.31-4.68a.53.53 0 0 0-.95.001L9.216 6.974a2.1 2.1 0 0 1-1.597 1.16l-5.165.755a.53.53 0 0 0-.294.906l3.736 3.637a2.1 2.1 0 0 1 .611 1.879l-.88 5.139a.53.53 0 0 0 .769.56l4.617-2.428.027-.014",
+      key: "rwo527"
+    }
+  ]
+];
+const StarMinus = createLucideIcon("star-minus", __iconNode);
+
+export { __iconNode, StarMinus as default };
+//# sourceMappingURL=star-minus.mjs.map