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/pen-tool.mjs

@@ -0,0 +1,31 @@
+/**
+ * @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: "M15.707 21.293a1 1 0 0 1-1.414 0l-1.586-1.586a1 1 0 0 1 0-1.414l5.586-5.586a1 1 0 0 1 1.414 0l1.586 1.586a1 1 0 0 1 0 1.414z",
+      key: "nt11vn"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "m18 13-1.375-6.874a1 1 0 0 0-.746-.776L3.235 2.028a1 1 0 0 0-1.207 1.207L5.35 15.879a1 1 0 0 0 .776.746L13 18",
+      key: "15qc1e"
+    }
+  ],
+  ["path", { d: "m2.3 2.3 7.286 7.286", key: "1wuzzi" }],
+  ["circle", { cx: "11", cy: "11", r: "2", key: "xmgehs" }]
+];
+const PenTool = createLucideIcon("pen-tool", __iconNode);
+
+export { __iconNode, PenTool as default };
+//# sourceMappingURL=pen-tool.mjs.map