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/vocabularies/applicator/allOf.js

@@ -0,0 +1,23 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const util_1 = require("../../compile/util");
+const def = {
+    keyword: "allOf",
+    schemaType: "array",
+    code(cxt) {
+        const { gen, schema, it } = cxt;
+        /* istanbul ignore if */
+        if (!Array.isArray(schema))
+            throw new Error("ajv implementation error");
+        const valid = gen.name("valid");
+        schema.forEach((sch, i) => {
+            if ((0, util_1.alwaysValidSchema)(it, sch))
+                return;
+            const schCxt = cxt.subschema({ keyword: "allOf", schemaProp: i }, valid);
+            cxt.ok(valid);
+            cxt.mergeEvaluated(schCxt);
+        });
+    },
+};
+exports.default = def;
+//# sourceMappingURL=allOf.js.map