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/map-pinned.mjs

@@ -0,0 +1,30 @@
+/**
+ * @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: "M18 8c0 3.613-3.869 7.429-5.393 8.795a1 1 0 0 1-1.214 0C9.87 15.429 6 11.613 6 8a6 6 0 0 1 12 0",
+      key: "11u0oz"
+    }
+  ],
+  ["circle", { cx: "12", cy: "8", r: "2", key: "1822b1" }],
+  [
+    "path",
+    {
+      d: "M8.714 14h-3.71a1 1 0 0 0-.948.683l-2.004 6A1 1 0 0 0 3 22h18a1 1 0 0 0 .948-1.316l-2-6a1 1 0 0 0-.949-.684h-3.712",
+      key: "q8zwxj"
+    }
+  ]
+];
+const MapPinned = createLucideIcon("map-pinned", __iconNode);
+
+export { __iconNode, MapPinned as default };
+//# sourceMappingURL=map-pinned.mjs.map