refactor(app): implement year filtering for accounts and enhance dashboard PDF generation

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

@@ -11,6 +11,9 @@ public partial class Dashboard
     private bool showAddAccount;
     private bool showEditClubName;
     private bool showRestoreConfirm;
+    private bool showYearFilterDialog;
+    private int? selectedYear = DateTime.Now.Year;
+    private List<int> availableYears = [];
     private string clubName = string.Empty;
     private string? operationMessage;
     private string operationMessageClass = "alert-info";
@@ -31,16 +34,22 @@ public partial class Dashboard
     protected override async Task OnInitializedAsync()
     {
         await LoadClubName();
-        await LoadAccounts();
+        await LoadAll();
     }
 
     #endregion
 
     #region Data Loading
 
+    private async Task LoadAll()
+    {
+        await LoadAccounts();
+        availableYears = await EntryService.GetAllEntryYearsAsync();
+    }
+
     private async Task LoadAccounts()
     {
-        accounts = await AccountService.GetAllAccountsAsync();
+        accounts = await AccountService.GetAllAccountsAsync(selectedYear);
     }
 
     private async Task LoadClubName()
@@ -56,7 +65,7 @@ public partial class Dashboard
     {
         await AccountService.CreateAccountAsync(name);
         showAddAccount = false;
-        await LoadAccounts();
+        await LoadAll();
     }
 
     private async Task HandleSaveClubName(string newName)
@@ -104,8 +113,26 @@ public partial class Dashboard
 
     private async Task HandleDashboardExportAsync()
     {
-        var pdf = await PdfStatementService.GenerateDashboardStatementAsync();
-        savedPdfPath = await FileSaveService.SaveFileAsync(pdf, $"{DisplayClubName}_Übersicht.pdf");
+        var pdf = await PdfStatementService.GenerateDashboardStatementAsync(selectedYear);
+        var suffix = selectedYear.HasValue ? $"_{selectedYear.Value}" : "_Gesamt";
+        savedPdfPath = await FileSaveService.SaveFileAsync(pdf, $"{DisplayClubName}_Übersicht{suffix}.pdf");
+    }
+
+    private void OpenYearFilterDialog()
+    {
+        showYearFilterDialog = true;
+    }
+
+    private void CloseYearFilterDialog()
+    {
+        showYearFilterDialog = false;
+    }
+
+    private async Task SelectFilterYear(int? year)
+    {
+        selectedYear = year;
+        showYearFilterDialog = false;
+        await LoadAll();
     }
 
     private async Task HandleOpenSavedPdf()
@@ -138,5 +165,7 @@ public partial class Dashboard
         return amount.ToString("N2", CultureInfo.GetCultureInfo("de-DE")) + " €";
     }
 
+    private string GetFilterLabel() => selectedYear?.ToString() ?? "Alle";
+
     #endregion
 }