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/joystick.mjs

@@ -0,0 +1,25 @@
+/**
+ * @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: "M21 17a2 2 0 0 0-2-2H5a2 2 0 0 0-2 2v2a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-2Z",
+      key: "jg2n2t"
+    }
+  ],
+  ["path", { d: "M6 15v-2", key: "gd6mvg" }],
+  ["path", { d: "M12 15V9", key: "8c7uyn" }],
+  ["circle", { cx: "12", cy: "6", r: "3", key: "1gm2ql" }]
+];
+const Joystick = createLucideIcon("joystick", __iconNode);
+
+export { __iconNode, Joystick as default };
+//# sourceMappingURL=joystick.mjs.map