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/cctv.mjs

@@ -0,0 +1,32 @@
+/**
+ * @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: "M16.75 12h3.632a1 1 0 0 1 .894 1.447l-2.034 4.069a1 1 0 0 1-1.708.134l-2.124-2.97",
+      key: "ir91b5"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "M17.106 9.053a1 1 0 0 1 .447 1.341l-3.106 6.211a1 1 0 0 1-1.342.447L3.61 12.3a2.92 2.92 0 0 1-1.3-3.91L3.69 5.6a2.92 2.92 0 0 1 3.92-1.3z",
+      key: "jlp8i1"
+    }
+  ],
+  ["path", { d: "M2 19h3.76a2 2 0 0 0 1.8-1.1L9 15", key: "19bib8" }],
+  ["path", { d: "M2 21v-4", key: "l40lih" }],
+  ["path", { d: "M7 9h.01", key: "19b3jx" }]
+];
+const Cctv = createLucideIcon("cctv", __iconNode);
+
+export { __iconNode, Cctv as default };
+//# sourceMappingURL=cctv.mjs.map