feat(account): add user management view

src/global/accountSyncState.ts

@@ -0,0 +1,26 @@
+import { ref, watch } from "vue";
+
+const INSTALLED_SYNC_STORAGE_KEY = "spark-store-installed-sync-enabled";
+
+const readSyncEnabled = (): boolean | null => {
+  const savedValue = localStorage.getItem(INSTALLED_SYNC_STORAGE_KEY);
+  if (savedValue === "true") return true;
+  if (savedValue === "false") return false;
+  return null;
+};
+
+export const installedSyncEnabled = ref<boolean | null>(readSyncEnabled());
+
+export const setInstalledSyncEnabled = (enabled: boolean): void => {
+  installedSyncEnabled.value = enabled;
+  localStorage.setItem(INSTALLED_SYNC_STORAGE_KEY, String(enabled));
+};
+
+watch(installedSyncEnabled, (enabled) => {
+  if (enabled === null) {
+    localStorage.removeItem(INSTALLED_SYNC_STORAGE_KEY);
+    return;
+  }
+
+  localStorage.setItem(INSTALLED_SYNC_STORAGE_KEY, String(enabled));
+});