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/tree-palm.mjs

@@ -0,0 +1,28 @@
+/**
+ * @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: "M13 8c0-2.76-2.46-5-5.5-5S2 5.24 2 8h2l1-1 1 1h4", key: "foxbe7" }],
+  [
+    "path",
+    { d: "M13 7.14A5.82 5.82 0 0 1 16.5 6c3.04 0 5.5 2.24 5.5 5h-3l-1-1-1 1h-3", key: "18arnh" }
+  ],
+  [
+    "path",
+    {
+      d: "M5.89 9.71c-2.15 2.15-2.3 5.47-.35 7.43l4.24-4.25.7-.7.71-.71 2.12-2.12c-1.95-1.96-5.27-1.8-7.42.35",
+      key: "ywahnh"
+    }
+  ],
+  ["path", { d: "M11 15.5c.5 2.5-.17 4.5-1 6.5h4c2-5.5-.5-12-1-14", key: "ft0feo" }]
+];
+const TreePalm = createLucideIcon("tree-palm", __iconNode);
+
+export { __iconNode, TreePalm as default };
+//# sourceMappingURL=tree-palm.mjs.map