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/circle-dot-dashed.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: "M10.1 2.18a9.93 9.93 0 0 1 3.8 0", key: "1qdqn0" }],
+  ["path", { d: "M17.6 3.71a9.95 9.95 0 0 1 2.69 2.7", key: "1bq7p6" }],
+  ["path", { d: "M21.82 10.1a9.93 9.93 0 0 1 0 3.8", key: "1rlaqf" }],
+  ["path", { d: "M20.29 17.6a9.95 9.95 0 0 1-2.7 2.69", key: "1xk03u" }],
+  ["path", { d: "M13.9 21.82a9.94 9.94 0 0 1-3.8 0", key: "l7re25" }],
+  ["path", { d: "M6.4 20.29a9.95 9.95 0 0 1-2.69-2.7", key: "1v18p6" }],
+  ["path", { d: "M2.18 13.9a9.93 9.93 0 0 1 0-3.8", key: "xdo6bj" }],
+  ["path", { d: "M3.71 6.4a9.95 9.95 0 0 1 2.7-2.69", key: "1jjmaz" }],
+  ["circle", { cx: "12", cy: "12", r: "1", key: "41hilf" }]
+];
+const CircleDotDashed = createLucideIcon("circle-dot-dashed", __iconNode);
+
+export { __iconNode, CircleDotDashed as default };
+//# sourceMappingURL=circle-dot-dashed.mjs.map