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/drill.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 18a1 1 0 0 1 1 1v2a1 1 0 0 1-1 1H5a3 3 0 0 1-3-3 1 1 0 0 1 1-1z", key: "ioqxb1" }
+  ],
+  [
+    "path",
+    {
+      d: "M13 10H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a1 1 0 0 1 1 1v6a1 1 0 0 1-1 1l-.81 3.242a1 1 0 0 1-.97.758H8",
+      key: "1rs59n"
+    }
+  ],
+  ["path", { d: "M14 4h3a1 1 0 0 1 1 1v2a1 1 0 0 1-1 1h-3", key: "105ega" }],
+  ["path", { d: "M18 6h4", key: "66u95g" }],
+  ["path", { d: "m5 10-2 8", key: "xt2lic" }],
+  ["path", { d: "m7 18 2-8", key: "1bzku2" }]
+];
+const Drill = createLucideIcon("drill", __iconNode);
+
+export { __iconNode, Drill as default };
+//# sourceMappingURL=drill.mjs.map