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/blender.mjs

@@ -0,0 +1,27 @@
+/**
+ * @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: "M8 14a2 2 0 0 0-1.963 1.615l-1.018 5.193A1 1 0 0 0 6 22h12a1 1 0 0 0 .981-1.192l-1.018-5.193A2 2 0 0 0 16 14z",
+      key: "11zxmj"
+    }
+  ],
+  ["path", { d: "m17 2-1 12", key: "nxm2fw" }],
+  ["path", { d: "M8.006 14 7 2", key: "13bxiv" }],
+  ["path", { d: "M7.565 8.787A5 5 0 0 0 12 8a5 5 0 0 1 4.56-.75", key: "1s61ad" }],
+  ["path", { d: "M19 2H5a2 2 0 0 0-2 2v5a2 2 0 0 0 .688 1.5", key: "gel3rg" }],
+  ["path", { d: "M12 18h.01", key: "mhygvu" }]
+];
+const Blender = createLucideIcon("blender", __iconNode);
+
+export { __iconNode, Blender as default };
+//# sourceMappingURL=blender.mjs.map