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/paintbrush.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: "m14.622 17.897-10.68-2.913", key: "vj2p1u" }],
+  [
+    "path",
+    {
+      d: "M18.376 2.622a1 1 0 1 1 3.002 3.002L17.36 9.643a.5.5 0 0 0 0 .707l.944.944a2.41 2.41 0 0 1 0 3.408l-.944.944a.5.5 0 0 1-.707 0L8.354 7.348a.5.5 0 0 1 0-.707l.944-.944a2.41 2.41 0 0 1 3.408 0l.944.944a.5.5 0 0 0 .707 0z",
+      key: "18tc5c"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "M9 8c-1.804 2.71-3.97 3.46-6.583 3.948a.507.507 0 0 0-.302.819l7.32 8.883a1 1 0 0 0 1.185.204C12.735 20.405 16 16.792 16 15",
+      key: "ytzfxy"
+    }
+  ]
+];
+const Paintbrush = createLucideIcon("paintbrush", __iconNode);
+
+export { __iconNode, Paintbrush as default };
+//# sourceMappingURL=paintbrush.mjs.map