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/rocket.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: "M12 15v5s3.03-.55 4-2c1.08-1.62 0-5 0-5", key: "qeys4" }],
+  [
+    "path",
+    {
+      d: "M4.5 16.5c-1.5 1.26-2 5-2 5s3.74-.5 5-2c.71-.84.7-2.13-.09-2.91a2.18 2.18 0 0 0-2.91-.09",
+      key: "u4xsad"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "M9 12a22 22 0 0 1 2-3.95A12.88 12.88 0 0 1 22 2c0 2.72-.78 7.5-6 11a22.4 22.4 0 0 1-4 2z",
+      key: "676m9"
+    }
+  ],
+  ["path", { d: "M9 12H4s.55-3.03 2-4c1.62-1.08 5 .05 5 .05", key: "92ym6u" }]
+];
+const Rocket = createLucideIcon("rocket", __iconNode);
+
+export { __iconNode, Rocket as default };
+//# sourceMappingURL=rocket.mjs.map