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/cigarette.mjs

@@ -0,0 +1,20 @@
+/**
+ * @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: "M17 12H3a1 1 0 0 0-1 1v2a1 1 0 0 0 1 1h14", key: "1mb5g1" }],
+  ["path", { d: "M18 8c0-2.5-2-2.5-2-5", key: "1il607" }],
+  ["path", { d: "M21 16a1 1 0 0 0 1-1v-2a1 1 0 0 0-1-1", key: "1yl5r7" }],
+  ["path", { d: "M22 8c0-2.5-2-2.5-2-5", key: "1gah44" }],
+  ["path", { d: "M7 12v4", key: "jqww69" }]
+];
+const Cigarette = createLucideIcon("cigarette", __iconNode);
+
+export { __iconNode, Cigarette as default };
+//# sourceMappingURL=cigarette.mjs.map