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/tempy/readme.md

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+# tempy [![Build Status](https://travis-ci.com/sindresorhus/tempy.svg?branch=master)](https://travis-ci.com/github/sindresorhus/tempy)
+
+> Get a random temporary file or directory path
+
+## Install
+
+```
+$ npm install tempy
+```
+
+## Usage
+
+```js
+const tempy = require('tempy');
+
+tempy.file();
+//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/4f504b9edb5ba0e89451617bf9f971dd'
+
+tempy.file({extension: 'png'});
+//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/a9fb0decd08179eb6cf4691568aa2018.png'
+
+tempy.file({name: 'unicorn.png'});
+//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/f7f62bfd4e2a05f1589947647ed3f9ec/unicorn.png'
+
+tempy.directory();
+//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/2f3d094aec2cb1b93bb0f4cffce5ebd6'
+
+tempy.directory({prefix: 'name'});
+//=> '/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T/name_3c085674ad31223b9653c88f725d6b41'
+```
+
+## API
+
+### tempy.file(options?)
+
+Get a temporary file path you can write to.
+
+#### options
+
+Type: `object`
+
+*You usually won't need either the `extension` or `name` option. Specify them only when actually needed.*
+
+##### extension
+
+Type: `string`
+
+File extension.
+
+##### name
+
+Type: `string`
+
+Filename. Mutually exclusive with the `extension` option.
+
+### tempy.directory([options])
+
+Get a temporary directory path. The directory is created for you.
+
+#### options
+
+Type: `Object`
+
+##### prefix
+
+
+Type: `string`
+
+Directory prefix.
+
+Useful for testing by making it easier to identify cache directories that are created.
+
+*You usually won't need this option. Specify it only when actually needed.*
+
+### tempy.write(fileContent, options?)
+
+Write data to a random temp file.
+
+##### fileContent
+
+Type: `string | Buffer | TypedArray | DataView | stream.Readable`
+
+Data to write to the temp file.
+
+##### options
+
+See [options](#options).
+
+### tempy.writeSync(fileContent, options?)
+
+Synchronously write data to a random temp file.
+
+##### fileContent
+
+Type: `string | Buffer | TypedArray | DataView`
+
+Data to write to the temp file.
+
+##### options
+
+See [options](#options).
+
+### tempy.root
+
+Get the root temporary directory path. For example: `/private/var/folders/3x/jf5977fn79jbglr7rk0tq4d00000gn/T`
+
+## FAQ
+
+#### Why doesn't it have a cleanup method?
+
+Temp files will be periodically cleaned up on macOS. Most Linux distros will clean up on reboot. If you're generating a lot of temp files, it's recommended to use a complementary module like [`del`](https://github.com/sindresorhus/del) for cleanup.