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/package-plus.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: "M12 22V12", key: "d0xqtd" }],
+  ["path", { d: "M16 17h6", key: "1ook5g" }],
+  ["path", { d: "M19 14v6", key: "1ckrd5" }],
+  [
+    "path",
+    {
+      d: "M21 10.535V8a2 2 0 0 0-1-1.73l-7-4a2 2 0 0 0-2 0l-7 4A2 2 0 0 0 3 8v8a2 2 0 0 0 1 1.729l7 4a2 2 0 0 0 2 .001l1.675-.955",
+      key: "28k6lz"
+    }
+  ],
+  ["path", { d: "M3.29 7 12 12l8.71-5", key: "19ckod" }],
+  ["path", { d: "m7.5 4.27 8.997 5.148", key: "9yrvtv" }]
+];
+const PackagePlus = createLucideIcon("package-plus", __iconNode);
+
+export { __iconNode, PackagePlus as default };
+//# sourceMappingURL=package-plus.mjs.map