Display transactions and balances in account currency

- Transaction amounts, totals, and sidebar badges in the Transactions page now show in the account's native currency (EUR, USD, etc.) instead of always CHF
- Fixed FX conversion in SaveTransaction/GetTransaction to fire when either the origin or target account is a foreign-currency account, not only the origin side

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,64 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Commands
+
+```bash
+# Build
+dotnet build
+
+# Run (dev server at http://localhost:5225)
+cd Schaad.Accounting.UI && dotnet run
+
+# Publish
+dotnet publish -c Release
+```
+
+There are no automated tests or lint commands.
+
+## Architecture
+
+**AccountingNext** is a Swiss personal accounting app built with ASP.NET Core 9 + Blazor (interactive server-side rendering) and Microsoft Fluent UI. Data is stored as XML files on disk — no database.
+
+### Projects
+
+| Project | Role |
+|---|---|
+| `Schaad.Accounting.UI` | Blazor web app — pages, dialogs, layout |
+| `Schaad.Accounting.Services` | Business logic — balances, FX conversion, file import, charts |
+| `Schaad.Accounting.Db` | Repository layer — XML serialization/deserialization |
+| `Schaad.Accounting.Common` | Shared models, DTOs, interfaces |
+
+### Data flow
+
+```
+Blazor Pages/Dialogs (UI)
+  → Services (ViewService, FileService, ChartService)
+  → Repositories (AccountRepository, TransactionRepository, …)
+  → XML files: {DataPath}/{year}/{mandator}/Data/*.xml
+```
+
+Data is multi-year and multi-mandator. Each combination has its own directory under `DataPath` (configured in `appsettings.Development.json`). When a new year is opened, the previous year's data is copied as the starting point.
+
+### Key services
+
+- **ViewService** — aggregates account balances, applies FX rates, builds datasets for the UI
+- **FileService** — imports bank statements (MT940, CAMT053 via external `Schaad.Finance.dll`), parses PDFs, manages backups
+- **ChartService** — produces data for Plotly charts (assets, spendings over time)
+- **SettingsService** — manages the active year, mandator, and file paths
+
+### UI structure
+
+Pages live in `Schaad.Accounting.UI/Components/Pages/`. Each page typically has a companion `Dialogs/` subfolder with Fluent UI dialog components for CRUD operations. The app is hardcoded to the `de-CH` culture.
+
+### Key external dependencies
+
+- `Microsoft.FluentUI.AspNetCore.Components` — UI components (FluentDataGrid, FluentDialog, etc.)
+- `Plotly.Blazor` — charts
+- `FreeSpire.PDF` — PDF parsing for bank statement imports
+- `Schaad.Finance.dll` / `Schaad.Finance.Api.dll` — proprietary DLLs for MT940/CAMT053 parsing and FX rate lookups (FixerIo API key in `appsettings.Development.json`)
+
+### Domain constants
+
+`ClassIds` in `Schaad.Accounting.Common` defines the Swiss accounting chart-of-accounts classes: Activa=1000, Passiva=2000, Income=3000, Expenses=4000.

Schaad.Accounting.Db/Repositories/TransactionRepository.cs

@@ -32,17 +32,17 @@ namespace Schaad.Accounting.Repositories
         {
             transaction.Value = Math.Abs(transaction.Value);
 
-            // prevent saving fxrate for chf account
-            var isFxAccount = accountRepository.GetAccount(transaction.OriginAccountId).IsFxAccount;
+            var originIsFx = accountRepository.GetAccount(transaction.OriginAccountId).IsFxAccount;
+            var targetIsFx = accountRepository.GetAccount(transaction.TargetAccountId).IsFxAccount;
+            var isFxAccount = originIsFx || targetIsFx;
 
-            // if source account is fx account, we pass a foreign value -> calc to chf
+            // user enters amount in the foreign account's currency -> convert to CHF for storage
             if (isFxAccount && transaction.FxRate != 0)
             {
                 transaction.Value = transaction.Value * transaction.FxRate.Value;
             }
 
-            isFxAccount |= accountRepository.GetAccount(transaction.TargetAccountId).IsFxAccount;
-            if (isFxAccount == false)
+            if (!isFxAccount)
             {
                 transaction.FxRate = null;
             }
@@ -69,8 +69,9 @@ namespace Schaad.Accounting.Repositories
             var transactions = GetTransactionList();
             var transaction = transactions.FirstOrDefault(t => t.Id == id);
 
-            // if source account is fx account, we save in chf currency -> calc to foreign currency for display
-            var isFxAccount = accountRepository.GetAccount(transaction.OriginAccountId).IsFxAccount;
+            // value is stored in CHF -> convert back to foreign currency for display/editing
+            var isFxAccount = accountRepository.GetAccount(transaction.OriginAccountId).IsFxAccount
+                || accountRepository.GetAccount(transaction.TargetAccountId).IsFxAccount;
             if (isFxAccount && transaction.FxRate != 0)
             {
                 transaction.Value = transaction.Value / transaction.FxRate.Value;

Schaad.Accounting.UI/Components/Pages/Transactions.razor

@@ -17,7 +17,7 @@
                             </div>
                             <div style="margin-left: auto;">
                                 <FluentBadge Appearance="Appearance.Neutral">
-                                    @Math.Abs(account.BalanceCHF).ToString("C2")
+                                    @Math.Abs(account.Balance).ToString("N2") @account.Currency
                                 </FluentBadge>
                             </div>
                         </FluentStack>
@@ -34,7 +34,7 @@
                 @selectedAccount.Name
             </FluentGridItem>
             <FluentGridItem xs="4" Class="align-content-center">
-                Total @Math.Abs(selectedAccount.Balance).ToString("C2") in @transactionList?.Count() Transaktionen
+                Total @Math.Abs(selectedAccount.Balance).ToString("N2") @selectedAccount.Currency in @transactionList?.Count() Transaktionen
             </FluentGridItem>
             <FluentGridItem xs="4" Class="align-content-center" Justify="JustifyContent.FlexEnd">
                 <FluentButton IconStart="@(new Icons.Regular.Size16.Add())" Appearance="Appearance.Neutral" OnClick="AddAsync">Neue Transaktion hinzufügen</FluentButton>
@@ -49,7 +49,9 @@
             <TemplateColumn Title="Gegenkonto">
                 @GetAccountName(context)
             </TemplateColumn>
-            <PropertyColumn Property="@(p => p.Value)" Format="C2" Align="Align.End"/>
+            <TemplateColumn Title="Betrag" Align="Align.End">
+                @context.GetValue(selectedAccount.IsFxAccount).ToString("N2") @selectedAccount.Currency
+            </TemplateColumn>
             <TemplateColumn Align="Align.Center" Width="50px">
                 <FluentButton IconEnd="@(new Icons.Regular.Size16.Delete())" Appearance="Appearance.Neutral" OnClick="@(() => DeleteAsync(context.Id))"/>
             </TemplateColumn>