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/video-off.mjs

@@ -0,0 +1,21 @@
+/**
+ * @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: "M10.66 6H14a2 2 0 0 1 2 2v2.5l5.248-3.062A.5.5 0 0 1 22 7.87v8.196", key: "w8jjjt" }
+  ],
+  ["path", { d: "M16 16a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h2", key: "1xawa7" }],
+  ["path", { d: "m2 2 20 20", key: "1ooewy" }]
+];
+const VideoOff = createLucideIcon("video-off", __iconNode);
+
+export { __iconNode, VideoOff as default };
+//# sourceMappingURL=video-off.mjs.map