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/ajv/dist/compile/names.js

@@ -0,0 +1,28 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const codegen_1 = require("./codegen");
+const names = {
+    // validation function arguments
+    data: new codegen_1.Name("data"), // data passed to validation function
+    // args passed from referencing schema
+    valCxt: new codegen_1.Name("valCxt"), // validation/data context - should not be used directly, it is destructured to the names below
+    instancePath: new codegen_1.Name("instancePath"),
+    parentData: new codegen_1.Name("parentData"),
+    parentDataProperty: new codegen_1.Name("parentDataProperty"),
+    rootData: new codegen_1.Name("rootData"), // root data - same as the data passed to the first/top validation function
+    dynamicAnchors: new codegen_1.Name("dynamicAnchors"), // used to support recursiveRef and dynamicRef
+    // function scoped variables
+    vErrors: new codegen_1.Name("vErrors"), // null or array of validation errors
+    errors: new codegen_1.Name("errors"), // counter of validation errors
+    this: new codegen_1.Name("this"),
+    // "globals"
+    self: new codegen_1.Name("self"),
+    scope: new codegen_1.Name("scope"),
+    // JTD serialize/parse name for JSON string and position
+    json: new codegen_1.Name("json"),
+    jsonPos: new codegen_1.Name("jsonPos"),
+    jsonLen: new codegen_1.Name("jsonLen"),
+    jsonPart: new codegen_1.Name("jsonPart"),
+};
+exports.default = names;
+//# sourceMappingURL=names.js.map