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/forklift.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: "M12 12H5a2 2 0 0 0-2 2v5", key: "7zsz91" }],
+  ["path", { d: "M15 19h7", key: "1askl3" }],
+  ["path", { d: "M16 19V2", key: "1gf9nk" }],
+  [
+    "path",
+    {
+      d: "M6 12V7a2 2 0 0 1 2-2h2.172a2 2 0 0 1 1.414.586l3.828 3.828A2 2 0 0 1 16 10.828",
+      key: "enx9tf"
+    }
+  ],
+  ["path", { d: "M7 19h4", key: "fumhkk" }],
+  ["circle", { cx: "13", cy: "19", r: "2", key: "wjnkru" }],
+  ["circle", { cx: "5", cy: "19", r: "2", key: "v8kfzx" }]
+];
+const Forklift = createLucideIcon("forklift", __iconNode);
+
+export { __iconNode, Forklift as default };
+//# sourceMappingURL=forklift.mjs.map