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/wrench-off.mjs

@@ -0,0 +1,24 @@
+/**
+ * @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: "M10.747 5.093a6 6 0 0 1 6.841-2.882c.438.12.54.662.219.984L14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.106-3.105c.32-.322.863-.22.983.218a6 6 0 0 1-2.882 6.842",
+      key: "sded7h"
+    }
+  ],
+  ["path", { d: "m13.5 13.5-7.88 7.88a1 1 0 0 1-2.999-3l7.88-7.88", key: "66etnh" }],
+  ["path", { d: "m2 2 20 20", key: "1ooewy" }]
+];
+const WrenchOff = createLucideIcon("wrench-off", __iconNode);
+
+export { __iconNode, WrenchOff as default };
+//# sourceMappingURL=wrench-off.mjs.map