Add invoice provision-period PDF handling

Normalize invoice provision periods in PDF generation, switch admin labels between single-date and range modes, add end-to-end tests, update package and frontend bundle versions, and note the invoice lifecycle docs update.

Fuchs.Tests/InvoicePdfProvisionPeriodTests.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Fuchs.intranet;
+using Fuchs.Notifications;
+using Fuchs.Services;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging.Abstractions;
+using MigraDoc.DocumentObjectModel;
+using Moq;
+using Xunit;
+
+namespace Fuchs.Tests;
+
+/// <summary>
+/// The stored Leistungsdatum / -zeitraum must reach the invoice PDF's admin block (it was never
+/// passed to the text blocks, so every invoice printed "Leistungszeitraum: -").
+/// </summary>
+public class InvoicePdfProvisionPeriodTests
+{
+    private sealed class NoHttp : IHttpClientFactory
+    {
+        public HttpClient CreateClient(string name) => throw new InvalidOperationException("no HTTP expected");
+    }
+
+    [Theory]
+    [InlineData("2026-06-18", "18.06.2026")]
+    [InlineData("2026-06-01 - 2026-06-30", "01.06.2026 - 30.06.2026")]
+    [InlineData("18.06.2026", "18.06.2026")]
+    [InlineData("01.06.2026 - 30.06.2026", "01.06.2026 - 30.06.2026")]
+    [InlineData("R2026-0258", "R2026-0258")]
+    [InlineData("", "")]
+    [InlineData(null, "")]
+    [InlineData("nach Absprache", "nach Absprache")]
+    public void ProvisionPeriodForDisplay_MixedFormats_ShowsGermanDates(string? input, string expected)
+    {
+        Assert.Equal(expected, InvoiceService.ProvisionPeriodForDisplay(input));
+    }
+
+    [Theory]
+    [InlineData("18.06.2026", "18.06.2026", "Leistungsdatum")]
+    [InlineData("01.06.2026 - 30.06.2026", "01.06.2026 - 30.06.2026", "Leistungszeitraum")]
+    [InlineData("2026-06-18", "18.06.2026", "Leistungsdatum")]
+    [InlineData("2026-06-01 - 2026-06-30", "01.06.2026 - 30.06.2026", "Leistungszeitraum")]
+    [InlineData("  18.06.2026  ", "18.06.2026", "Leistungsdatum")]
+    [InlineData("", "", "Leistungszeitraum")]
+    [InlineData(null, "", "Leistungszeitraum")]
+    public void ApplyProvisionPeriod_StoredValue_SetsGermanValueAndMatchingLabel(string? stored, string expectedValue, string expectedLabel)
+    {
+        var tb = new FuchsPdf.FdsTextBlocks();
+
+        InvoiceService.ApplyProvisionPeriod(tb, stored);
+
+        Assert.Equal(expectedValue, tb.ProvisionPeriod);
+        Assert.Equal(expectedLabel, tb.AdminProvLabel);
+    }
+
+    [Theory]
+    [InlineData("18.06.2026", "18.06.2026", "Leistungsdatum")]
+    [InlineData("2026-06-01 - 2026-06-30", "01.06.2026 - 30.06.2026", "Leistungszeitraum")]
+    [InlineData(null, "", "Leistungszeitraum")]
+    public async Task GenerateInvoicePdfAsync_StoredProvisionPeriod_ReachesAdminBlock(string? stored, string expectedValue, string expectedLabel)
+    {
+        FuchsPdf.FdsTextBlocks? captured = null;
+        var pdf = new Mock<IPdfService>();
+        pdf.Setup(p => p.WriteLetterAsync(It.IsAny<FuchsPdf.FdsTextBlocks>(), It.IsAny<bool>()))
+           .Callback<FuchsPdf.FdsTextBlocks, bool>((tb, _) => captured = tb)
+           .ReturnsAsync(new Document());
+        var erechnung = new Mock<IERechnungService>();
+        erechnung.SetupGet(e => e.Enabled).Returns(false);
+        var config = new ConfigurationBuilder().Build();
+        var svc = new InvoiceService(new Fuchs_intranet(config), pdf.Object, new Mock<IBlobStorageService>().Object,
+            new Mock<IEventService>().Object, erechnung.Object, new NoHttp(), config, NullLogger<InvoiceService>.Instance);
+        var reg = new Dictionary<string, object?> { ["Id"] = "W7VAL", ["InvoiceId"] = "R2026-0258" };
+        if (stored != null) reg["ProvisionPeriod"] = stored;
+        var invoice = new FdsInvoiceData { InvoiceRegistration = new OCORE.OCORE_dictionaries.GenericObjectDictionary(reg) };
+
+        await svc.GenerateInvoicePdfAsync(invoice, draft: true);
+
+        Assert.NotNull(captured);
+        Assert.Equal(expectedValue, captured!.ProvisionPeriod);
+        Assert.Equal(expectedLabel, captured.AdminProvLabel);
+    }
+}

Fuchs/Docs/INVOICE_LIFECYCLE.md

@@ -97,7 +97,9 @@ payload; see `EVAL_live_invoice_editing.md` for the rationale.
   it drives the EN 16931 eRechnung and composes the free-text `SendToAddress` for the
   PDF (see [`Concepts/erechnung-output.md`](Concepts/erechnung-output.md)). The **service
   date/period** (Leistungsdatum/-zeitraum) is likewise a structured German-date dialog
-  (`$inv.eProvisionPeriod`) — a single date or a from/to range — mapped to BT-72 / BG-14.
+  (`$inv.eProvisionPeriod`) — a single date or a from/to range — mapped to BT-72 / BG-14
+  and printed in the PDF's admin block (`InvoiceService.ApplyProvisionPeriod`; legacy ISO
+  values are shown as German dates).
 - **§13b reverse-charge** toggle (`$inv.sp13b`) — suppresses VAT lines/columns.
 - **Set-pricing display mode** (`$inv.ssetmode` / `setSetmode`) — `SetPrice`
   (default) / `SetOnly`; see `INVOICE_SET_PRICING.md`. Purely presentational

Fuchs/Fuchs.csproj

@@ -51,10 +51,10 @@
     <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
     <!-- New packages (needed for .NET 10) -->
     <PackageReference Include="Microsoft.Data.SqlClient" Version="7.1.1" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="4.1.2" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="4.1.3" />
     <PackageReference Include="System.Configuration.ConfigurationManager" Version="10.0.12" />
     <PackageReference Include="System.Drawing.Common" Version="10.0.12" />
-    <PackageReference Include="Azure.Storage.Blobs" Version="12.30.0" />
+    <PackageReference Include="Azure.Storage.Blobs" Version="12.30.1" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="App_Data\cache\" />

Fuchs/Services/InvoiceService.cs

@@ -320,6 +320,22 @@ public class InvoiceService : IInvoiceService
         }
     }
 
+    /// <summary>
+    /// Puts the stored Leistungsdatum / -zeitraum into the PDF admin block: German dates (legacy ISO
+    /// values converted) and the label the editor shows — "Leistungsdatum" for one date,
+    /// "Leistungszeitraum" for a from–to range.
+    /// </summary>
+    internal static void ApplyProvisionPeriod(FuchsPdf.FdsTextBlocks tb, string? provisionPeriod)
+    {
+        tb.ProvisionPeriod = ProvisionPeriodForDisplay(provisionPeriod).Trim();
+        tb.AdminProvLabel  = tb.ProvisionPeriod.Contains(" - ") || tb.ProvisionPeriod.Length == 0
+            ? "Leistungszeitraum" : "Leistungsdatum";
+    }
+
+    /// <summary>Shows ISO dates (yyyy-MM-dd) saved by older editor versions as German dd.MM.yyyy.</summary>
+    internal static string ProvisionPeriodForDisplay(string? period) =>
+        System.Text.RegularExpressions.Regex.Replace(period ?? "", @"\b(\d{4})-(\d{2})-(\d{2})\b", "$3.$2.$1");
+
     public async Task<Document> GenerateInvoicePdfAsync(FdsInvoiceData invoice, bool draft)
     {
         using var act = FuchsTelemetry.StartActivity("invoice.render");
@@ -339,6 +355,7 @@ public class InvoiceService : IInvoiceService
             // e-invoice issue date (ERechnungMapper), see InvoiceDates / ADR 0032.
             AdminDatumValue = InvoiceDates.IssueDate(reg).ToDateTime(TimeOnly.MinValue)
         };
+        ApplyProvisionPeriod(tb, reg?.getString("ProvisionPeriod"));
         var inlineImages = await ResolveInlineImagesAsync(invoice);
         var doc = await _pdf.WriteLetterAsync(tb, draft);
         doc.Info.Title = reg?.getString("InvoiceTitle") ?? "";