- Check if tag exists before creating new one
- Use existing tag and preserve custom messages
- Force push tag in case it was updated
- Update docs to recommend creating tag first

Write simplified message to .git/MERGE_MSG after merge
instead of verbose default merge message

After git merge, run git reset to unstage all changes.
This allows users to use git add -p for selective hunk staging.

- Replace manual file comparison with git-based workflow
- Extract zip to temporary branch and initiate merge
- User can now use git add -p for selective hunk staging
- Simplify UI to show merge instructions
- Include hidden files (important for Eclipse projects)
- Skip .git, .DS_Store, and __MACOSX directories
- Update app version to 2.0.0