fix: remove test-build directory from source control and add to .gitignore

- Remove accidentally committed test-build/ directory containing generated HTML files
- Add test-build/ to .gitignore to prevent future accidental commits
- Keep build artifacts out of source control for cleaner repository

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: pekkah

.gitignore

@@ -271,6 +271,7 @@ docs-html/
 gh-pages/
 _build/
 output/
+test-build/
 
 # Generated UI bundle (created from ui-bundle/ during build)
 **/Resources/ui-bundle.zip