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/zodiac-aquarius.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: "m2 10 2.456-3.684a.7.7 0 0 1 1.106-.013l2.39 3.413a.7.7 0 0 0 1.096-.001l2.402-3.432a.7.7 0 0 1 1.098 0l2.402 3.432a.7.7 0 0 0 1.098 0l2.389-3.413a.7.7 0 0 1 1.106.013L22 10",
+      key: "1o8iok"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "m2 18.002 2.456-3.684a.7.7 0 0 1 1.106-.013l2.39 3.413a.7.7 0 0 0 1.097 0l2.402-3.432a.7.7 0 0 1 1.098 0l2.402 3.432a.7.7 0 0 0 1.098 0l2.389-3.413a.7.7 0 0 1 1.106.013L22 18.002",
+      key: "112qy7"
+    }
+  ]
+];
+const ZodiacAquarius = createLucideIcon("zodiac-aquarius", __iconNode);
+
+export { __iconNode, ZodiacAquarius as default };
+//# sourceMappingURL=zodiac-aquarius.mjs.map