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/mouse-pointer-click.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: "M14 4.1 12 6", key: "ita8i4" }],
+  ["path", { d: "m5.1 8-2.9-.8", key: "1go3kf" }],
+  ["path", { d: "m6 12-1.9 2", key: "mnht97" }],
+  ["path", { d: "M7.2 2.2 8 5.1", key: "1cfko1" }],
+  [
+    "path",
+    {
+      d: "M9.037 9.69a.498.498 0 0 1 .653-.653l11 4.5a.5.5 0 0 1-.074.949l-4.349 1.041a1 1 0 0 0-.74.739l-1.04 4.35a.5.5 0 0 1-.95.074z",
+      key: "s0h3yz"
+    }
+  ]
+];
+const MousePointerClick = createLucideIcon("mouse-pointer-click", __iconNode);
+
+export { __iconNode, MousePointerClick as default };
+//# sourceMappingURL=mouse-pointer-click.mjs.map