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/@babel/helper-validator-option/lib/find-suggestion.js

@@ -0,0 +1,39 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.findSuggestion = findSuggestion;
+const {
+  min
+} = Math;
+function levenshtein(a, b) {
+  let t = [],
+    u = [],
+    i,
+    j;
+  const m = a.length,
+    n = b.length;
+  if (!m) {
+    return n;
+  }
+  if (!n) {
+    return m;
+  }
+  for (j = 0; j <= n; j++) {
+    t[j] = j;
+  }
+  for (i = 1; i <= m; i++) {
+    for (u = [i], j = 1; j <= n; j++) {
+      u[j] = a[i - 1] === b[j - 1] ? t[j - 1] : min(t[j - 1], t[j], u[j - 1]) + 1;
+    }
+    t = u;
+  }
+  return u[n];
+}
+function findSuggestion(str, arr) {
+  const distances = arr.map(el => levenshtein(el, str));
+  return arr[distances.indexOf(min(...distances))];
+}
+
+//# sourceMappingURL=find-suggestion.js.map