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/scan-text.mjs

@@ -0,0 +1,22 @@
+/**
+ * @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: "M3 7V5a2 2 0 0 1 2-2h2", key: "aa7l1z" }],
+  ["path", { d: "M17 3h2a2 2 0 0 1 2 2v2", key: "4qcy5o" }],
+  ["path", { d: "M21 17v2a2 2 0 0 1-2 2h-2", key: "6vwrx8" }],
+  ["path", { d: "M7 21H5a2 2 0 0 1-2-2v-2", key: "ioqczr" }],
+  ["path", { d: "M7 8h8", key: "1jbsf9" }],
+  ["path", { d: "M7 12h10", key: "b7w52i" }],
+  ["path", { d: "M7 16h6", key: "1vyc9m" }]
+];
+const ScanText = createLucideIcon("scan-text", __iconNode);
+
+export { __iconNode, ScanText as default };
+//# sourceMappingURL=scan-text.mjs.map