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/phone-off.mjs

@@ -0,0 +1,30 @@
+/**
+ * @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: "M10.1 13.9a14 14 0 0 0 3.732 2.668 1 1 0 0 0 1.213-.303l.355-.465A2 2 0 0 1 17 15h3a2 2 0 0 1 2 2v3a2 2 0 0 1-2 2 18 18 0 0 1-12.728-5.272",
+      key: "1wngk7"
+    }
+  ],
+  ["path", { d: "M22 2 2 22", key: "y4kqgn" }],
+  [
+    "path",
+    {
+      d: "M4.76 13.582A18 18 0 0 1 2 4a2 2 0 0 1 2-2h3a2 2 0 0 1 2 2v3a2 2 0 0 1-.8 1.6l-.468.351a1 1 0 0 0-.292 1.233 14 14 0 0 0 .244.473",
+      key: "10hv5p"
+    }
+  ]
+];
+const PhoneOff = createLucideIcon("phone-off", __iconNode);
+
+export { __iconNode, PhoneOff as default };
+//# sourceMappingURL=phone-off.mjs.map