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/wine.mjs

@@ -0,0 +1,22 @@
+/**
+ * @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 22h8", key: "rmew8v" }],
+  ["path", { d: "M7 10h10", key: "1101jm" }],
+  ["path", { d: "M12 15v7", key: "t2xh3l" }],
+  [
+    "path",
+    { d: "M12 15a5 5 0 0 0 5-5c0-2-.5-4-2-8H9c-1.5 4-2 6-2 8a5 5 0 0 0 5 5Z", key: "10ffi3" }
+  ]
+];
+const Wine = createLucideIcon("wine", __iconNode);
+
+export { __iconNode, Wine as default };
+//# sourceMappingURL=wine.mjs.map