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/git-graph.mjs

@@ -0,0 +1,21 @@
+/**
+ * @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: "5", cy: "6", r: "3", key: "1qnov2" }],
+  ["path", { d: "M5 9v6", key: "158jrl" }],
+  ["circle", { cx: "5", cy: "18", r: "3", key: "104gr9" }],
+  ["path", { d: "M12 3v18", key: "108xh3" }],
+  ["circle", { cx: "19", cy: "6", r: "3", key: "108a5v" }],
+  ["path", { d: "M16 15.7A9 9 0 0 0 19 9", key: "1e3vqb" }]
+];
+const GitGraph = createLucideIcon("git-graph", __iconNode);
+
+export { __iconNode, GitGraph as default };
+//# sourceMappingURL=git-graph.mjs.map