build: eliminate all CS compiler warnings (zero-warning build for v0.9.0)

Generation/Converters/Argumentum.AssetConverter.VisualTests/FallacyCardTests.cs

@@ -58,7 +58,7 @@ public async Task Render_NominalCard()
             _output.WriteLine(JsonSerializer.Serialize(config, new JsonSerializerOptions { WriteIndented = true }));
             _output.WriteLine("--------------------------------------");
 
-            string imageFile = null;
+            string? imageFile = null;
             try
             {
                 // 2. Exécution "in-process"

Generation/Converters/Argumentum.AssetConverter/DatasetUpdater/DatasetUpdaterConfig.cs

@@ -1,4 +1,5 @@
-using Spectre.Console;
+#nullable enable annotations
+using Spectre.Console;
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;

Generation/Converters/Argumentum.AssetConverter/ImageHelper.cs

@@ -173,7 +173,7 @@ public static void ConvertToCmyk(this MagickImage image)
             image.Alpha(AlphaOption.Remove);
             image.Settings.BackgroundColor = MagickColors.White;
             //image.TransformColorSpace(ColorProfile.SRGB, ColorProfile.USWebCoatedSWOP);
-            image.TransformColorSpace( ColorProfile.USWebCoatedSWOP, ColorTransformMode.Quantum);
+            image.TransformColorSpace( ColorProfiles.USWebCoatedSWOP, ColorTransformMode.Quantum);
 
             image.ColorSpace = ColorSpace.CMYK;
             image.Settings.ColorSpace = ColorSpace.CMYK;

Generation/Converters/Argumentum.AssetConverter/Mindmapper/FallacyMindMapDocumentConfig.cs

@@ -22,7 +22,6 @@
 using System.Threading.Tasks;
 using System.Diagnostics;
 using System.Threading;
-using System.Xml.Xsl;
 using Color = System.Drawing.Color;
 using Argumentum.AssetConverter.Entities;
 

Generation/Converters/Argumentum.AssetConverter/WebBasedGenerator/CardGridComponent.cs

@@ -19,6 +19,16 @@ public CardGridComponent(IEnumerable<byte[]> cardImageData, int columns, float p
 
         public void Compose(IContainer container)
         {
+            // QuestPDF deprecated Grid in 2022.11 in favour of Table, but this project deliberately
+            // pins QuestPDF at 2022.12.12 (thread-safety — see CLAUDE.md stable-versions table) and is
+            // NOT upgrading it for the v0.9.0 release. Grid stays: a faithful Table migration is not
+            // possible here without a layout regression. Grid(N) means "N fixed-width columns regardless
+            // of item count" and stores N as a cheap layout parameter, so it tolerates the large/degenerate
+            // column counts that ComputePageGeometry can yield for edge configs (e.g. tiny card sizes).
+            // Materialising N explicit Table.RelativeColumn() definitions instead allocates N column
+            // objects and OOMs on those same inputs (regression caught by PdfAssemblerTests). The obsolete
+            // warning is therefore suppressed with justification rather than "fixed" by a risky rewrite.
+#pragma warning disable CS0618 // QuestPDF Grid deprecated; pinned version + no faithful Table equivalent
             container.Grid(grid =>
             {
                 grid.Columns(_columns);
@@ -36,6 +46,7 @@ public void Compose(IContainer container)
                     }
                 }
             });
+#pragma warning restore CS0618
         }
     }
 }

Generation/Converters/Argumentum.AssetConverter/WebBasedGenerator/PdfManager.cs

@@ -19,10 +19,6 @@ public PdfManager()
         {
         }
 
-        private const float InchToCentimetre = 2.54f;
-        private const float InchToPoints = 72;
-        private float MmToPointsFactor = 0.1f / InchToCentimetre * InchToPoints;
-
         internal void GenerateFacesOnly(string baseName, List<CardImages> cardImages, bool overwriteExistingDocs)
         {
             var targetFiles = new List<(string fileName, Func<MagickImageCollection> documentImages)>();