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/file-scan.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: "M20 10V8a2.4 2.4 0 0 0-.706-1.704l-3.588-3.588A2.4 2.4 0 0 0 14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h4.35",
+      key: "1cdjst"
+    }
+  ],
+  ["path", { d: "M14 2v5a1 1 0 0 0 1 1h5", key: "wfsgrz" }],
+  ["path", { d: "M16 14a2 2 0 0 0-2 2", key: "ceaadl" }],
+  ["path", { d: "M16 22a2 2 0 0 1-2-2", key: "1wqh5n" }],
+  ["path", { d: "M20 14a2 2 0 0 1 2 2", key: "1ny6zw" }],
+  ["path", { d: "M20 22a2 2 0 0 0 2-2", key: "1l9q4k" }]
+];
+const FileScan = createLucideIcon("file-scan", __iconNode);
+
+export { __iconNode, FileScan as default };
+//# sourceMappingURL=file-scan.mjs.map