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/jake/test/unit/jakefile.js

@@ -0,0 +1,36 @@
+
+task('foo', function () {
+  console.log('ran top-level foo');
+});
+
+task('bar', function () {
+  console.log('ran top-level bar');
+});
+
+task('zerb', function () {
+  console.log('ran zerb');
+});
+
+namespace('zooby', function () {
+  task('zerp', function () {});
+
+  task('derp', ['zerp'], function () {});
+
+  namespace('frang', function () {
+
+    namespace('w00t', function () {
+      task('bar', function () {
+        console.log('ran zooby:frang:w00t:bar');
+      });
+    });
+
+    task('asdf', function () {});
+  });
+
+});
+
+namespace('hurr', function () {
+  namespace('durr');
+});
+
+