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/vite-plugin-pwa/dist/client/dev/preact.js

@@ -0,0 +1,16 @@
+// src/client/dev/preact.ts
+import { useState } from "preact/hooks";
+function useRegisterSW(_options = {}) {
+  const needRefresh = useState(false);
+  const offlineReady = useState(false);
+  const updateServiceWorker = (_reloadPage) => {
+  };
+  return {
+    needRefresh,
+    offlineReady,
+    updateServiceWorker
+  };
+}
+export {
+  useRegisterSW
+};

frontend/node_modules/vite-plugin-pwa/dist/client/dev/react.js

@@ -0,0 +1,16 @@
+// src/client/dev/react.ts
+import { useState } from "react";
+function useRegisterSW(_options = {}) {
+  const needRefresh = useState(false);
+  const offlineReady = useState(false);
+  const updateServiceWorker = (_reloadPage) => {
+  };
+  return {
+    needRefresh,
+    offlineReady,
+    updateServiceWorker
+  };
+}
+export {
+  useRegisterSW
+};

frontend/node_modules/vite-plugin-pwa/dist/client/dev/register.js

@@ -0,0 +1,8 @@
+// src/client/dev/register.ts
+function registerSW(_options = {}) {
+  return async (_reloadPage = true) => {
+  };
+}
+export {
+  registerSW
+};

frontend/node_modules/vite-plugin-pwa/dist/client/dev/solid.js

@@ -0,0 +1,16 @@
+// src/client/dev/solid.ts
+import { createSignal } from "solid-js";
+function useRegisterSW(_options = {}) {
+  const needRefresh = createSignal(false);
+  const offlineReady = createSignal(false);
+  const updateServiceWorker = (_reloadPage) => {
+  };
+  return {
+    needRefresh,
+    offlineReady,
+    updateServiceWorker
+  };
+}
+export {
+  useRegisterSW
+};

frontend/node_modules/vite-plugin-pwa/dist/client/dev/svelte.js

@@ -0,0 +1,16 @@
+// src/client/dev/svelte.ts
+import { writable } from "svelte/store";
+function useRegisterSW(_options = {}) {
+  const needRefresh = writable(false);
+  const offlineReady = writable(false);
+  const updateServiceWorker = (_reloadPage) => {
+  };
+  return {
+    needRefresh,
+    offlineReady,
+    updateServiceWorker
+  };
+}
+export {
+  useRegisterSW
+};

frontend/node_modules/vite-plugin-pwa/dist/client/dev/vue.js

@@ -0,0 +1,16 @@
+// src/client/dev/vue.ts
+import { ref } from "vue";
+function useRegisterSW(_options = {}) {
+  const needRefresh = ref(false);
+  const offlineReady = ref(false);
+  const updateServiceWorker = (_reloadPage) => {
+  };
+  return {
+    updateServiceWorker,
+    offlineReady,
+    needRefresh
+  };
+}
+export {
+  useRegisterSW
+};