Switch to MinVer, add CI/CD, unify thumbnail options

- Add .gitlab-ci.yml for Windows CI/CD: build, publish, and GitLab Release with artifact upload
- Replace GitVersion.MsBuild with MinVer for versioning; update all versioning logic in .csproj
- Remove GitVersion CLI fallback for Visual Studio builds
- Update post-publish renaming to use MinVer's Version property
- Replace multiple thumbnail text checkboxes with a single ComboBox selector in MainWindow.xaml
- Change default UI startup: prefer WPF MainWindow, fallback to WinForms MainForm

.gitlab-ci.yml

@@ -0,0 +1,55 @@
+stages:
+  - build
+  - publish
+
+variables:
+  DOTNET_CLI_TELEMETRY_OPTOUT: "1"
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: "1"
+  BUILD_CONFIG: "Release"
+
+# Build job for Windows runner (shell executor). Remove 'image' so the runner uses the host environment.
+build_windows:
+  stage: build
+  tags:
+    - windows
+  script:
+    - dotnet --info
+    - dotnet restore
+    - dotnet build "imagecatalog\ImageCatalog 2.csproj" -c $BUILD_CONFIG -v minimal
+  artifacts:
+    paths:
+      - "**/bin/$BUILD_CONFIG/net10.0-windows/**"
+    expire_in: 1 hour
+
+# Publish and create GitLab Release when building a tag. This job expects a Windows runner with PowerShell and curl available.
+publish_release:
+  stage: publish
+  tags:
+    - windows
+  needs:
+    - build_windows
+  script:
+    # Publish the app
+    - dotnet publish "imagecatalog\ImageCatalog 2.csproj" -c $BUILD_CONFIG -r win-x64 --self-contained false -o publish
+    - echo "Published to $(pwd)\\publish"
+    # Find first file in publish folder
+    - $file = Get-ChildItem -Path publish -File | Select-Object -First 1; Write-Host "Uploading $($file.FullName)"
+    # Upload to GitLab project uploads API to get a public URL for the artifact
+    - $uploadUrl = "$env:CI_API_V4_URL/projects/$env:CI_PROJECT_ID/uploads"
+    - $formData = "file=@$($file.FullName)"
+    - $uploadResp = curl --silent --show-error --header "JOB-TOKEN:$env:CI_JOB_TOKEN" --form $formData $uploadUrl
+    - $uploadJson = $uploadResp | ConvertFrom-Json
+    - $assetUrl = "$env:CI_SERVER_URL$($uploadJson.url)"
+    - 'Write-Host "Uploaded asset url: $assetUrl"'
+    # Create the release using uploads URL
+    - $body = @{ name = $env:CI_COMMIT_TAG; tag_name = $env:CI_COMMIT_TAG; description = "Automated release from CI"; assets = @{ links = @(@{ name = "$($file.Name)"; url = $assetUrl }) } } | ConvertTo-Json -Depth 10
+    - Invoke-RestMethod -Method Post -Uri "$env:CI_API_V4_URL/projects/$env:CI_PROJECT_ID/releases" -Headers @{ "JOB-TOKEN" = $env:CI_JOB_TOKEN } -Body $body -ContentType "application/json"
+  artifacts:
+    paths:
+      - publish/*
+    expire_in: 1 day
+  only:
+    - tags
+
+# Notes for runner setup: Ensure a GitLab Windows runner with tag 'windows' is registered and has .NET 10 SDK installed.
+# Use the shell executor on the Windows machine so the job runs in the host PowerShell environment