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/replace-all.mjs

@@ -0,0 +1,24 @@
+/**
+ * @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: "M14 14a1 1 0 0 1 1 1v5a1 1 0 0 1-1 1", key: "zg1ipl" }],
+  ["path", { d: "M14 4a1 1 0 0 1 1-1", key: "dhj8ez" }],
+  ["path", { d: "M15 10a1 1 0 0 1-1-1", key: "1mnyi5" }],
+  ["path", { d: "M19 14a1 1 0 0 1 1 1v5a1 1 0 0 1-1 1", key: "txt6k4" }],
+  ["path", { d: "M21 4a1 1 0 0 0-1-1", key: "sfs9ap" }],
+  ["path", { d: "M21 9a1 1 0 0 1-1 1", key: "mp6qeo" }],
+  ["path", { d: "m3 7 3 3 3-3", key: "x25e72" }],
+  ["path", { d: "M6 10V5a2 2 0 0 1 2-2h2", key: "15xut4" }],
+  ["rect", { x: "3", y: "14", width: "7", height: "7", rx: "1", key: "1bkyp8" }]
+];
+const ReplaceAll = createLucideIcon("replace-all", __iconNode);
+
+export { __iconNode, ReplaceAll as default };
+//# sourceMappingURL=replace-all.mjs.map