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/worm.mjs

@@ -0,0 +1,24 @@
+/**
+ * @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: "m19 12-1.5 3", key: "9bcu4o" }],
+  ["path", { d: "M19.63 18.81 22 20", key: "121v98" }],
+  [
+    "path",
+    {
+      d: "M6.47 8.23a1.68 1.68 0 0 1 2.44 1.93l-.64 2.08a6.76 6.76 0 0 0 10.16 7.67l.42-.27a1 1 0 1 0-2.73-4.21l-.42.27a1.76 1.76 0 0 1-2.63-1.99l.64-2.08A6.66 6.66 0 0 0 3.94 3.9l-.7.4a1 1 0 1 0 2.55 4.34z",
+      key: "1tij6q"
+    }
+  ]
+];
+const Worm = createLucideIcon("worm", __iconNode);
+
+export { __iconNode, Worm as default };
+//# sourceMappingURL=worm.mjs.map