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/eye-off.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: "M10.733 5.076a10.744 10.744 0 0 1 11.205 6.575 1 1 0 0 1 0 .696 10.747 10.747 0 0 1-1.444 2.49",
+      key: "ct8e1f"
+    }
+  ],
+  ["path", { d: "M14.084 14.158a3 3 0 0 1-4.242-4.242", key: "151rxh" }],
+  [
+    "path",
+    {
+      d: "M17.479 17.499a10.75 10.75 0 0 1-15.417-5.151 1 1 0 0 1 0-.696 10.75 10.75 0 0 1 4.446-5.143",
+      key: "13bj9a"
+    }
+  ],
+  ["path", { d: "m2 2 20 20", key: "1ooewy" }]
+];
+const EyeOff = createLucideIcon("eye-off", __iconNode);
+
+export { __iconNode, EyeOff as default };
+//# sourceMappingURL=eye-off.mjs.map