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/notepad-text-dashed.mjs

@@ -0,0 +1,28 @@
+/**
+ * @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: "M8 2v4", key: "1cmpym" }],
+  ["path", { d: "M12 2v4", key: "3427ic" }],
+  ["path", { d: "M16 2v4", key: "4m81vk" }],
+  ["path", { d: "M16 4h2a2 2 0 0 1 2 2v2", key: "j91f56" }],
+  ["path", { d: "M20 12v2", key: "w8o0tu" }],
+  ["path", { d: "M20 18v2a2 2 0 0 1-2 2h-1", key: "1c9ggx" }],
+  ["path", { d: "M13 22h-2", key: "191ugt" }],
+  ["path", { d: "M7 22H6a2 2 0 0 1-2-2v-2", key: "1rt9px" }],
+  ["path", { d: "M4 14v-2", key: "1v0sqh" }],
+  ["path", { d: "M4 8V6a2 2 0 0 1 2-2h2", key: "1mwabg" }],
+  ["path", { d: "M8 10h6", key: "3oa6kw" }],
+  ["path", { d: "M8 14h8", key: "1fgep2" }],
+  ["path", { d: "M8 18h5", key: "17enja" }]
+];
+const NotepadTextDashed = createLucideIcon("notepad-text-dashed", __iconNode);
+
+export { __iconNode, NotepadTextDashed as default };
+//# sourceMappingURL=notepad-text-dashed.mjs.map