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/@isaacs/cliui/README.md

@@ -0,0 +1,151 @@
+# @isaacs/cliui
+
+Fork of [cliui](http://npm.im/cliui). Fully CommonJS/ESM
+hybridized, with all dependencies vendored and optimized for
+minimal bundle size without sacrificing functionality.
+
+easily create complex multi-column command-line-interfaces.
+
+## Changes in v9
+
+The default export is no longer exported. So, intead of `import
+cliui from '@isaacs/cliui'`, you'll do `import { cliui } from
+'@isaacs/cliui'`. This is done in order to minimize typescript
+oddness between the CommonJS and ESM versions.
+
+A minified export is provided at `@isaacs/cliui/min`. If you are
+concerned about bundle size, that's the thing to use.
+
+## Example
+
+```js
+import { cliui } from '@isaacs/cliui'
+// or: const { cliui } = require('cliui')
+const ui = cliui()
+
+ui.div('Usage: $0 [command] [options]')
+
+ui.div({
+  text: 'Options:',
+  padding: [2, 0, 1, 0],
+})
+
+ui.div(
+  {
+    text: '-f, --file',
+    width: 20,
+    padding: [0, 4, 0, 4],
+  },
+  {
+    text:
+      'the file to load.' +
+      chalk.green('(if this description is long it wraps).'),
+    width: 20,
+  },
+  {
+    text: chalk.red('[required]'),
+    align: 'right',
+  },
+)
+
+console.log(ui.toString())
+```
+
+## Deno/ESM Support
+
+Load the minified version from unpkg.
+
+```typescript
+import { cliui } from 'https://unpkg.com/@isaacs/cliui/dist/esm/index.min.js'
+
+const ui = cliui({})
+
+ui.div('Usage: $0 [command] [options]')
+
+ui.div({
+  text: 'Options:',
+  padding: [2, 0, 1, 0],
+})
+
+ui.div({
+  text: '-f, --file',
+  width: 20,
+  padding: [0, 4, 0, 4],
+})
+
+console.log(ui.toString())
+```
+
+<img width="500" src="screenshot.png">
+
+## Layout DSL
+
+cliui exposes a simple layout DSL:
+
+If you create a single `ui.div`, passing a string rather than an
+object:
+
+- `\n`: characters will be interpreted as new rows.
+- `\t`: characters will be interpreted as new columns.
+- `\s`: characters will be interpreted as padding.
+
+**as an example...**
+
+```js
+var ui = require('./')({
+  width: 60,
+})
+
+ui.div(
+  'Usage: node ./bin/foo.js\n' +
+    '  <regex>\t  provide a regex\n' +
+    '  <glob>\t  provide a glob\t [required]',
+)
+
+console.log(ui.toString())
+```
+
+**will output:**
+
+```shell
+Usage: node ./bin/foo.js
+  <regex>  provide a regex
+  <glob>   provide a glob          [required]
+```
+
+## Methods
+
+```js
+cliui = require('@isaacs/cliui')
+```
+
+### cliui({width: integer})
+
+Specify the maximum width of the UI being generated.
+If no width is provided, cliui will try to get the current window's width and use it, and if that doesn't work, width will be set to `80`.
+
+### cliui({wrap: boolean})
+
+Enable or disable the wrapping of text in a column.
+
+### cliui.div(column, column, column)
+
+Create a row with any number of columns, a column
+can either be a string, or an object with the following
+options:
+
+- **text:** some text to place in the column.
+- **width:** the width of a column.
+- **align:** alignment, `right` or `center`.
+- **padding:** `[top, right, bottom, left]`.
+- **border:** should a border be placed around the div?
+
+### cliui.span(column, column, column)
+
+Similar to `div`, except the next row will be appended without
+a new line being created.
+
+### cliui.resetOutput()
+
+Resets the UI elements of the current cliui instance, maintaining the values
+set for `width` and `wrap`.