feat(accounts): preview and confirm cross-year balance corrections (U12)

src/Duempelkas.App/Pages/Accounts/AccountDetail.razor

@@ -125,7 +125,7 @@
 
 @if (showEditCarryover)
 {
-    <EditCarryoverDialog CurrentAmount="@(balance?.CarryoverBalance ?? 0)"
+    <EditCarryoverDialog AccountName="@(account?.Name ?? "")" Year="selectedYear" InitialBalance="@(account?.CarryoverBalance ?? 0)" CurrentEndBalance="@(balance?.TotalBalance ?? 0)" CurrentAmount="@(balance?.CarryoverBalance ?? 0)"
                          OnSave="HandleSaveCarryover"
                          OnCancel="() => showEditCarryover = false" />
 }

src/Duempelkas.App/Pages/Accounts/AccountDetail.razor.cs

@@ -110,9 +110,10 @@ public partial class AccountDetail
 
     private async Task HandleSaveCarryover(decimal newAmount)
     {
-        await AccountService.UpdateCarryoverAsync(AccountId, newAmount, selectedYear);
-        showEditCarryover = false;
+        await AccountService.CorrectCarryoverAsync(AccountId, newAmount, selectedYear, balance!.CarryoverBalance, account!.CarryoverBalance);
         await LoadAll();
+        showEditCarryover = false;
+        Toasts.Show("Bestandskorrektur gespeichert. Die Änderung gilt für alle Jahre.", ToastKind.Success);
     }
 
     private Task HandleEntryCreated(BookingSaved saved) => HandleBookingSaved(saved);

src/Duempelkas.App/Pages/Dashboard.razor.cs

@@ -84,9 +84,9 @@ public partial class Dashboard
 
     #region Actions
 
-    private async Task HandleAccountCreated(string name)
+    private async Task HandleAccountCreated(AccountSetup setup)
     {
-        await AccountService.CreateAccountAsync(name);
+        await AccountService.CreateAccountAsync(setup.Name, setup.InitialBalance);
         showAddAccount = false;
         await LoadAll();
     }