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/whole-word.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 = [
+  ["circle", { cx: "7", cy: "12", r: "3", key: "12clwm" }],
+  ["path", { d: "M10 9v6", key: "17i7lo" }],
+  ["circle", { cx: "17", cy: "12", r: "3", key: "gl7c2s" }],
+  ["path", { d: "M14 7v8", key: "dl84cr" }],
+  ["path", { d: "M22 17v1c0 .5-.5 1-1 1H3c-.5 0-1-.5-1-1v-1", key: "lt2kga" }]
+];
+const WholeWord = createLucideIcon("whole-word", __iconNode);
+
+export { __iconNode, WholeWord as default };
+//# sourceMappingURL=whole-word.mjs.map