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/estree-walker/CHANGELOG.md

@@ -0,0 +1,92 @@
+# changelog
+
+## 2.0.2
+
+* Internal tidying up (change test runner, convert to JS)
+
+## 2.0.1
+
+* Robustify `this.remove()`, pass current index to walker functions ([#18](https://github.com/Rich-Harris/estree-walker/pull/18))
+
+## 2.0.0
+
+* Add an `asyncWalk` export ([#20](https://github.com/Rich-Harris/estree-walker/pull/20))
+* Internal rewrite
+
+## 1.0.1
+
+* Relax node type to `BaseNode` ([#17](https://github.com/Rich-Harris/estree-walker/pull/17))
+
+## 1.0.0
+
+* Don't cache child keys
+
+## 0.9.0
+
+* Add `this.remove()` method
+
+## 0.8.1
+
+* Fix pkg.files
+
+## 0.8.0
+
+* Adopt `estree` types
+
+## 0.7.0
+
+* Add a `this.replace(node)` method
+
+## 0.6.1
+
+* Only traverse nodes that exist and have a type ([#9](https://github.com/Rich-Harris/estree-walker/pull/9))
+* Only cache keys for nodes with a type ([#8](https://github.com/Rich-Harris/estree-walker/pull/8))
+
+## 0.6.0
+
+* Fix walker context type
+* Update deps, remove unncessary Bublé transformation
+
+## 0.5.2
+
+* Add types to package
+
+## 0.5.1
+
+* Prevent context corruption when `walk()` is called during a walk
+
+## 0.5.0
+
+* Export `childKeys`, for manually fixing in case of malformed ASTs
+
+## 0.4.0
+
+* Add TypeScript typings ([#3](https://github.com/Rich-Harris/estree-walker/pull/3))
+
+## 0.3.1
+
+* Include `pkg.repository` ([#2](https://github.com/Rich-Harris/estree-walker/pull/2))
+
+## 0.3.0
+
+* More predictable ordering
+
+## 0.2.1
+
+* Keep `context` shape
+
+## 0.2.0
+
+* Add ES6 build
+
+## 0.1.3
+
+* npm snafu
+
+## 0.1.2
+
+* Pass current prop and index to `enter`/`leave` callbacks
+
+## 0.1.1
+
+* First release