Fix regex pattern to handle clickable image badges with relative URLs

Fixes #656

Author: Copilot

src/NuGetizer.Tasks/CreatePackage.cs

@@ -238,7 +238,8 @@ void GeneratePackage(Stream output = null)
                     uri.Host.EndsWith("github.com"))
                 {
                     // expr to match markdown links with optional title. use named groups to capture the link text, url and optional title.
-                    linkExpr ??= new Regex(@"\[(?<text>[^\]]+)\]\((?<url>[^\s)]+)(?:\s+""(?<title>[^""]*)"")?\)", RegexOptions.None);
+                    // Handle image links inside clickable badges: [![alt](img)](url) by explicitly matching the image pattern
+                    linkExpr ??= new Regex(@"\[(?<text>!\[[^\]]*\]\([^\)]*\)|[^\]]+)\]\((?<url>[^\s)]+)(?:\s+""(?<title>[^""]*)"")?\)", RegexOptions.None);
                     var repoUrl = manifest.Metadata.Repository.Url.TrimEnd('/');
 
                     // Extract owner and repo from URL for raw.githubusercontent.com format

src/NuGetizer.Tests/CreatePackageTests.cs

@@ -443,6 +443,43 @@ public void when_readme_has_image_link_then_uses_raw_url()
             Assert.DoesNotContain("/blob/", readme);
         }
 
+        [Fact]
+        public void when_readme_has_clickable_image_badge_with_relative_url_then_replaces_url()
+        {
+            var content = Path.GetTempFileName();
+            File.WriteAllText(content, "[![EULA](https://img.shields.io/badge/EULA-OSMF-blue)](osmfeula.txt)");
+            task.Contents = new[]
+            {
+                new TaskItem(content, new Metadata
+                {
+                    { MetadataName.PackageId, task.Manifest.GetMetadata("Id") },
+                    { MetadataName.PackFolder, PackFolderKind.None },
+                    { MetadataName.PackagePath, "readme.md" }
+                }),
+            };
+
+            task.Manifest.SetMetadata("Readme", "readme.md");
+            task.Manifest.SetMetadata("RepositoryType", "git");
+            task.Manifest.SetMetadata("RepositoryUrl", "https://github.com/devlooped/nugetizer");
+            task.Manifest.SetMetadata("RepositorySha", "abc123def");
+
+            createPackage = true;
+            ExecuteTask(out var manifest);
+
+            Assert.NotNull(manifest);
+
+            var file = manifest.Files.FirstOrDefault(f => Path.GetFileName(f.Target) == manifest.Metadata.Readme);
+            Assert.NotNull(file);
+            Assert.True(File.Exists(file.Source));
+
+            var readme = File.ReadAllText(file.Source);
+
+            // Should replace the relative URL in the clickable image badge
+            Assert.Contains("https://raw.githubusercontent.com/devlooped/nugetizer/abc123def/osmfeula.txt", readme);
+            // Should preserve the absolute image URL
+            Assert.Contains("https://img.shields.io/badge/EULA-OSMF-blue", readme);
+        }
+
         [Fact]
         public void when_creating_package_with_simple_dependency_then_contains_dependency_group()
         {

src/NuGetizer.Tests/Scenarios/given_multitargeting_libraries/uilibrary.csproj

@@ -5,6 +5,7 @@
     <TargetFrameworks>net8.0;net8.0-windows;net8.0-maccatalyst</TargetFrameworks>
     <PackOnBuild>true</PackOnBuild>
     <IsPackable>true</IsPackable>
+    <SupportedOSPlatformVersion Condition="'$(TargetFramework)' == 'net8.0-maccatalyst'">14.0</SupportedOSPlatformVersion>
   </PropertyGroup>
 
   <ItemGroup>