disable the sort button when fewer than two items are present

src/stores/account.ts

@@ -124,6 +124,20 @@ export const useAccountsStore = defineStore('accounts', () => {
         return shownAccountCount;
     });
 
+    const maxCategoryAccountCount = computed<number>(() => {
+        let maxCount = 0;
+
+        for (const categorizedAccounts of values(allCategorizedAccountsMap.value)) {
+            const accountCount = categorizedAccounts.accounts.length;
+
+            if (accountCount > maxCount) {
+                maxCount = accountCount;
+            }
+        }
+
+        return maxCount;
+    });
+
     function loadAccountList(accounts: Account[]): void {
         allAccounts.value = accounts;
         allAccountsMap.value = {};
@@ -1076,6 +1090,7 @@ export const useAccountsStore = defineStore('accounts', () => {
         allVisiblePlainAccounts,
         allAvailableAccountsCount,
         allVisibleAccountsCount,
+        maxCategoryAccountCount,
         // functions
         updateAccountListInvalidState,
         resetAccounts,