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/bug.mjs

@@ -0,0 +1,26 @@
+/**
+ * @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 20v-9", key: "1qisl0" }],
+  ["path", { d: "M14 7a4 4 0 0 1 4 4v3a6 6 0 0 1-12 0v-3a4 4 0 0 1 4-4z", key: "uouzyp" }],
+  ["path", { d: "M14.12 3.88 16 2", key: "qol33r" }],
+  ["path", { d: "M21 21a4 4 0 0 0-3.81-4", key: "1b0z45" }],
+  ["path", { d: "M21 5a4 4 0 0 1-3.55 3.97", key: "5cxbf6" }],
+  ["path", { d: "M22 13h-4", key: "1jl80f" }],
+  ["path", { d: "M3 21a4 4 0 0 1 3.81-4", key: "1fjd4g" }],
+  ["path", { d: "M3 5a4 4 0 0 0 3.55 3.97", key: "1d7oge" }],
+  ["path", { d: "M6 13H2", key: "82j7cp" }],
+  ["path", { d: "m8 2 1.88 1.88", key: "fmnt4t" }],
+  ["path", { d: "M9 7.13V6a3 3 0 1 1 6 0v1.13", key: "1vgav8" }]
+];
+const Bug = createLucideIcon("bug", __iconNode);
+
+export { __iconNode, Bug as default };
+//# sourceMappingURL=bug.mjs.map