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/wheat.mjs

@@ -0,0 +1,59 @@
+/**
+ * @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 22 16 8", key: "60hf96" }],
+  [
+    "path",
+    {
+      d: "M3.47 12.53 5 11l1.53 1.53a3.5 3.5 0 0 1 0 4.94L5 19l-1.53-1.53a3.5 3.5 0 0 1 0-4.94Z",
+      key: "1rdhi6"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "M7.47 8.53 9 7l1.53 1.53a3.5 3.5 0 0 1 0 4.94L9 15l-1.53-1.53a3.5 3.5 0 0 1 0-4.94Z",
+      key: "1sdzmb"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "M11.47 4.53 13 3l1.53 1.53a3.5 3.5 0 0 1 0 4.94L13 11l-1.53-1.53a3.5 3.5 0 0 1 0-4.94Z",
+      key: "eoatbi"
+    }
+  ],
+  ["path", { d: "M20 2h2v2a4 4 0 0 1-4 4h-2V6a4 4 0 0 1 4-4Z", key: "19rau1" }],
+  [
+    "path",
+    {
+      d: "M11.47 17.47 13 19l-1.53 1.53a3.5 3.5 0 0 1-4.94 0L5 19l1.53-1.53a3.5 3.5 0 0 1 4.94 0Z",
+      key: "tc8ph9"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "M15.47 13.47 17 15l-1.53 1.53a3.5 3.5 0 0 1-4.94 0L9 15l1.53-1.53a3.5 3.5 0 0 1 4.94 0Z",
+      key: "2m8kc5"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "M19.47 9.47 21 11l-1.53 1.53a3.5 3.5 0 0 1-4.94 0L13 11l1.53-1.53a3.5 3.5 0 0 1 4.94 0Z",
+      key: "vex3ng"
+    }
+  ]
+];
+const Wheat = createLucideIcon("wheat", __iconNode);
+
+export { __iconNode, Wheat as default };
+//# sourceMappingURL=wheat.mjs.map