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/@babel/plugin-transform-export-namespace-from/lib/index.js

@@ -0,0 +1,46 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _helperPluginUtils = require("@babel/helper-plugin-utils");
+var _core = require("@babel/core");
+var _default = exports.default = (0, _helperPluginUtils.declare)(api => {
+  api.assertVersion(7);
+  return {
+    name: "transform-export-namespace-from",
+    manipulateOptions: (_, parser) => parser.plugins.push("exportNamespaceFrom"),
+    visitor: {
+      ExportNamedDeclaration(path) {
+        var _exported$name;
+        const {
+          node,
+          scope
+        } = path;
+        const {
+          specifiers
+        } = node;
+        const index = _core.types.isExportDefaultSpecifier(specifiers[0]) ? 1 : 0;
+        if (!_core.types.isExportNamespaceSpecifier(specifiers[index])) return;
+        const nodes = [];
+        if (index === 1) {
+          nodes.push(_core.types.exportNamedDeclaration(null, [specifiers.shift()], node.source));
+        }
+        const specifier = specifiers.shift();
+        const {
+          exported
+        } = specifier;
+        const uid = scope.generateUidIdentifier((_exported$name = exported.name) != null ? _exported$name : exported.value);
+        nodes.push(_core.types.importDeclaration([_core.types.importNamespaceSpecifier(uid)], _core.types.cloneNode(node.source)), _core.types.exportNamedDeclaration(null, [_core.types.exportSpecifier(_core.types.cloneNode(uid), exported)]));
+        if (node.specifiers.length >= 1) {
+          nodes.push(node);
+        }
+        const [importDeclaration] = path.replaceWithMultiple(nodes);
+        path.scope.registerDeclaration(importDeclaration);
+      }
+    }
+  };
+});
+
+//# sourceMappingURL=index.js.map