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-bugfix-v8-static-class-fields-redefine-readonly/README.md

@@ -0,0 +1,19 @@
+# @babel/plugin-bugfix-v8-static-class-fields-redefine-readonly
+
+> Transform static class fields assignments that are affected by https://crbug.com/v8/12421
+
+See our website [@babel/plugin-bugfix-v8-static-class-fields-redefine-readonly](https://babeljs.io/docs/babel-plugin-bugfix-v8-static-class-fields-redefine-readonly) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-bugfix-v8-static-class-fields-redefine-readonly
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-bugfix-v8-static-class-fields-redefine-readonly --dev
+```