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/ice-cream-bowl.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: "M12 17c5 0 8-2.69 8-6H4c0 3.31 3 6 8 6m-4 4h8m-4-3v3M5.14 11a3.5 3.5 0 1 1 6.71 0",
+      key: "1uxfcu"
+    }
+  ],
+  ["path", { d: "M12.14 11a3.5 3.5 0 1 1 6.71 0", key: "4k3m1s" }],
+  ["path", { d: "M15.5 6.5a3.5 3.5 0 1 0-7 0", key: "zmuahr" }]
+];
+const IceCreamBowl = createLucideIcon("ice-cream-bowl", __iconNode);
+
+export { __iconNode, IceCreamBowl as default };
+//# sourceMappingURL=ice-cream-bowl.mjs.map