chore: revert accidental changes to .gitignore

Author: Naineten

.gitignore

@@ -39,11 +39,3 @@ build/*.AppImage
 SourceGit.app/
 build.command
 src/Properties/launchSettings.json
-
-# Temporary and tool-specific files
-.claude/
-error_showcase.png
-publish/
-nul
-progress.md
-build_release.bat