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/cpu.mjs

@@ -0,0 +1,29 @@
+/**
+ * @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: "M12 20v2", key: "1lh1kg" }],
+  ["path", { d: "M12 2v2", key: "tus03m" }],
+  ["path", { d: "M17 20v2", key: "1rnc9c" }],
+  ["path", { d: "M17 2v2", key: "11trls" }],
+  ["path", { d: "M2 12h2", key: "1t8f8n" }],
+  ["path", { d: "M2 17h2", key: "7oei6x" }],
+  ["path", { d: "M2 7h2", key: "asdhe0" }],
+  ["path", { d: "M20 12h2", key: "1q8mjw" }],
+  ["path", { d: "M20 17h2", key: "1fpfkl" }],
+  ["path", { d: "M20 7h2", key: "1o8tra" }],
+  ["path", { d: "M7 20v2", key: "4gnj0m" }],
+  ["path", { d: "M7 2v2", key: "1i4yhu" }],
+  ["rect", { x: "4", y: "4", width: "16", height: "16", rx: "2", key: "1vbyd7" }],
+  ["rect", { x: "8", y: "8", width: "8", height: "8", rx: "1", key: "z9xiuo" }]
+];
+const Cpu = createLucideIcon("cpu", __iconNode);
+
+export { __iconNode, Cpu as default };
+//# sourceMappingURL=cpu.mjs.map