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/lib/compile/names.ts

@@ -0,0 +1,27 @@
+import {Name} from "./codegen"
+
+const names = {
+  // validation function arguments
+  data: new Name("data"), // data passed to validation function
+  // args passed from referencing schema
+  valCxt: new Name("valCxt"), // validation/data context - should not be used directly, it is destructured to the names below
+  instancePath: new Name("instancePath"),
+  parentData: new Name("parentData"),
+  parentDataProperty: new Name("parentDataProperty"),
+  rootData: new Name("rootData"), // root data - same as the data passed to the first/top validation function
+  dynamicAnchors: new Name("dynamicAnchors"), // used to support recursiveRef and dynamicRef
+  // function scoped variables
+  vErrors: new Name("vErrors"), // null or array of validation errors
+  errors: new Name("errors"), // counter of validation errors
+  this: new Name("this"),
+  // "globals"
+  self: new Name("self"),
+  scope: new Name("scope"),
+  // JTD serialize/parse name for JSON string and position
+  json: new Name("json"),
+  jsonPos: new Name("jsonPos"),
+  jsonLen: new Name("jsonLen"),
+  jsonPart: new Name("jsonPart"),
+}
+
+export default names