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/workbox-core/setCacheNameDetails.js

@@ -0,0 +1,60 @@
+/*
+  Copyright 2019 Google LLC
+
+  Use of this source code is governed by an MIT-style
+  license that can be found in the LICENSE file or at
+  https://opensource.org/licenses/MIT.
+*/
+import { assert } from './_private/assert.js';
+import { cacheNames } from './_private/cacheNames.js';
+import { WorkboxError } from './_private/WorkboxError.js';
+import './_version.js';
+/**
+ * Modifies the default cache names used by the Workbox packages.
+ * Cache names are generated as `<prefix>-<Cache Name>-<suffix>`.
+ *
+ * @param {Object} details
+ * @param {Object} [details.prefix] The string to add to the beginning of
+ *     the precache and runtime cache names.
+ * @param {Object} [details.suffix] The string to add to the end of
+ *     the precache and runtime cache names.
+ * @param {Object} [details.precache] The cache name to use for precache
+ *     caching.
+ * @param {Object} [details.runtime] The cache name to use for runtime caching.
+ * @param {Object} [details.googleAnalytics] The cache name to use for
+ *     `workbox-google-analytics` caching.
+ *
+ * @memberof workbox-core
+ */
+function setCacheNameDetails(details) {
+    if (process.env.NODE_ENV !== 'production') {
+        Object.keys(details).forEach((key) => {
+            assert.isType(details[key], 'string', {
+                moduleName: 'workbox-core',
+                funcName: 'setCacheNameDetails',
+                paramName: `details.${key}`,
+            });
+        });
+        if ('precache' in details && details['precache'].length === 0) {
+            throw new WorkboxError('invalid-cache-name', {
+                cacheNameId: 'precache',
+                value: details['precache'],
+            });
+        }
+        if ('runtime' in details && details['runtime'].length === 0) {
+            throw new WorkboxError('invalid-cache-name', {
+                cacheNameId: 'runtime',
+                value: details['runtime'],
+            });
+        }
+        if ('googleAnalytics' in details &&
+            details['googleAnalytics'].length === 0) {
+            throw new WorkboxError('invalid-cache-name', {
+                cacheNameId: 'googleAnalytics',
+                value: details['googleAnalytics'],
+            });
+        }
+    }
+    cacheNames.updateDetails(details);
+}
+export { setCacheNameDetails };