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/hand-heart.mjs

@@ -0,0 +1,31 @@
+/**
+ * @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: "M11 14h2a2 2 0 0 0 0-4h-3c-.6 0-1.1.2-1.4.6L3 16", key: "1v1a37" }],
+  [
+    "path",
+    {
+      d: "m14.45 13.39 5.05-4.694C20.196 8 21 6.85 21 5.75a2.75 2.75 0 0 0-4.797-1.837.276.276 0 0 1-.406 0A2.75 2.75 0 0 0 11 5.75c0 1.2.802 2.248 1.5 2.946L16 11.95",
+      key: "fhfbnt"
+    }
+  ],
+  ["path", { d: "m2 15 6 6", key: "10dquu" }],
+  [
+    "path",
+    {
+      d: "m7 20 1.6-1.4c.3-.4.8-.6 1.4-.6h4c1.1 0 2.1-.4 2.8-1.2l4.6-4.4a1 1 0 0 0-2.75-2.91",
+      key: "1x6kdw"
+    }
+  ]
+];
+const HandHeart = createLucideIcon("hand-heart", __iconNode);
+
+export { __iconNode, HandHeart as default };
+//# sourceMappingURL=hand-heart.mjs.map