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/view.mjs

@@ -0,0 +1,25 @@
+/**
+ * @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: "M21 17v2a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-2", key: "mrq65r" }],
+  ["path", { d: "M21 7V5a2 2 0 0 0-2-2H5a2 2 0 0 0-2 2v2", key: "be3xqs" }],
+  ["circle", { cx: "12", cy: "12", r: "1", key: "41hilf" }],
+  [
+    "path",
+    {
+      d: "M18.944 12.33a1 1 0 0 0 0-.66 7.5 7.5 0 0 0-13.888 0 1 1 0 0 0 0 .66 7.5 7.5 0 0 0 13.888 0",
+      key: "11ak4c"
+    }
+  ]
+];
+const View = createLucideIcon("view", __iconNode);
+
+export { __iconNode, View as default };
+//# sourceMappingURL=view.mjs.map