Merge remote-tracking branch 'origin/main'

# Conflicts:
#	LehrerApp.TemplateDesigner.Tests/ProjectLifecycleTests.cs
#	LehrerApp.TemplateDesigner/DesignerViewModel.cs
#	LehrerApp.TemplateDesigner/MainWindow.axaml
#	LehrerApp.Templating/LayoutParser.cs
#	LehrerApp.Templating/QuestTemplateRenderer.cs

LehrerApp.TemplateDesigner.Tests/PdfImportPipelineTests.cs

@@ -0,0 +1,93 @@
+using LehrerApp.TemplateDesigner;
+using LehrerApp.Templating;
+using Xunit;
+using System.Runtime.Versioning;
+using QuestPDF.Fluent;
+using QuestPDF.Infrastructure;
+
+namespace LehrerApp.TemplateDesigner.Tests;
+
+[SupportedOSPlatform("windows")]
+[SupportedOSPlatform("linux")]
+[SupportedOSPlatform("macos")]
+public sealed class PdfImportPipelineTests
+{
+    [Fact]
+    public void TemplateDiff_LaesstIdentischenTextStatischUndMarkiertAbweichung()
+    {
+        var pipeline = new PdfImportPipeline();
+        var template = Document(
+            Block("a", 40, 30, "Schule am Park"),
+            Block("b", 40, 100, "Max Mustermann"));
+        var example = Document(
+            Block("a2", 40, 30, "Schule am Park"),
+            Block("b2", 40, 100, "Erika Beispiel"));
+
+        var candidate = Assert.Single(pipeline.FindCandidates(example, template));
+
+        Assert.Equal("Erika Beispiel", candidate.OriginalText);
+        Assert.Equal(PdfImportConfidence.High, candidate.Confidence);
+    }
+
+    [Fact]
+    public void EinzelPdf_ErkenntDatumTypDeterministisch()
+    {
+        var pipeline = new PdfImportPipeline();
+
+        var candidate = Assert.Single(pipeline.FindCandidates(Document(Block("d", 400, 60, "31.08.2026")), null));
+
+        Assert.Equal("Datum", candidate.Name);
+        Assert.Equal(PlaceholderType.Date, candidate.Type);
+        Assert.Equal(PdfImportConfidence.High, candidate.Confidence);
+    }
+
+    [Fact]
+    public void UebernahmeErsetztDasAktuelleDesignerprojekt()
+    {
+        var result = new PdfImportResult("PAGE 595 842 pt\nTEXT 40 100 $Name\n",
+            new TemplateManifest
+            {
+                Id = "pdf-import", Name = "PDF-Import", PageSize = new(595, 842, "pt"),
+                Placeholders = [new("Name", PlaceholderType.Text)],
+            }, new Dictionary<string, byte[]>(),
+            [new PdfImportCandidate { Id = "x", BlockIds = ["x"], OriginalText = "Erika Beispiel", Name = "Name", Confidence = PdfImportConfidence.High }]);
+        var viewModel = new DesignerViewModel();
+
+        viewModel.ApplyPdfImport(result);
+
+        Assert.Equal("pt", viewModel.Unit);
+        Assert.Equal("Erika Beispiel", Assert.Single(viewModel.Placeholders).Sample);
+        Assert.Contains("$Name", viewModel.LayoutSource);
+        Assert.False(viewModel.CanExport);
+    }
+
+    [Fact]
+    public async Task EchtesPdf_WirdExtrahiertUndAlsRenderbareVorlageErzeugt()
+    {
+        QuestPDF.Settings.License = LicenseType.Community;
+        var path = Path.Combine(Path.GetTempPath(), $"pdf-import-{Guid.NewGuid():N}.pdf");
+        try
+        {
+            QuestPDF.Fluent.Document.Create(document => document.Page(page =>
+            {
+                page.Size(595, 842); page.Margin(40); page.Content().Text("Erika Beispiel").FontSize(11);
+            })).GeneratePdf(path);
+
+            var result = await new PdfImportPipeline().BuildAsync(path, null, null, null);
+            var viewModel = new DesignerViewModel();
+            viewModel.ApplyPdfImport(result);
+            var png = new QuestTemplateRenderer().RenderFirstPageToPng(viewModel.BuildLoaded(), viewModel.BuildDataProvider());
+
+            Assert.NotEmpty(result.Candidates);
+            Assert.Contains("pdf-import-background.png", result.Assets.Keys);
+            Assert.True(png.Length > 1_000);
+        }
+        finally { if (File.Exists(path)) File.Delete(path); }
+    }
+
+    private static PdfImportDocument Document(params PdfTextBlock[] blocks) =>
+        new([new PdfImportPage(1, 595, 842, blocks)]);
+
+    private static PdfTextBlock Block(string id, double x, double y, string text) =>
+        new(id, 1, x, y, 120, 12, 11, "Arial", false, false, text);
+}

LehrerApp.TemplateDesigner.Tests/ProjectLifecycleTests.cs

@@ -108,6 +108,15 @@ public sealed class ProjectLifecycleTests
         Assert.Empty(parsed.ContentFlows.Single().Elements);
     }
 
+    [Fact]
+    public void AktuelleAnsicht_KannAlsPdfGerendertWerden()
+    {
+        var pdf = new DesignerViewModel().RenderCurrentPdf();
+
+        Assert.True(pdf.Length > 100);
+        Assert.Equal("%PDF-", System.Text.Encoding.ASCII.GetString(pdf, 0, 5));
+    }
+
     private static readonly byte[] OnePixelPng = Convert.FromBase64String(
         "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=");
 }