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/DynamicIcon.mjs

@@ -0,0 +1,45 @@
+"use strict";
+"use client";
+/**
+ * @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 { forwardRef, useState, useEffect, createElement } from 'react';
+import dynamicIconImports from './dynamicIconImports.mjs';
+import Icon from './Icon.mjs';
+
+const iconNames = Object.keys(dynamicIconImports);
+async function getIconNode(name) {
+  if (!(name in dynamicIconImports)) {
+    throw new Error("[lucide-react]: Name in Lucide DynamicIcon not found");
+  }
+  const icon = await dynamicIconImports[name]();
+  return icon.__iconNode;
+}
+const DynamicIcon = forwardRef(
+  ({ name, fallback: Fallback, ...props }, ref) => {
+    const [iconNode, setIconNode] = useState();
+    useEffect(() => {
+      getIconNode(name).then(setIconNode).catch((error) => {
+        console.error(error);
+      });
+    }, [name]);
+    if (iconNode == null) {
+      if (Fallback == null) {
+        return null;
+      }
+      return createElement(Fallback);
+    }
+    return createElement(Icon, {
+      ref,
+      ...props,
+      iconNode
+    });
+  }
+);
+
+export { DynamicIcon as default, iconNames };
+//# sourceMappingURL=DynamicIcon.mjs.map