Studio now provides basic Git status, commits, and safe branch switching

Objo Studio will gain focused Git support for VCS-friendly .objosln projects. The initial release will show the current branch and repository change state, highlight added, modified, and deleted source lines and changed Studio items, let users commit selected logical items with a message, and safely switch between existing local branches.

Before those Git features are enabled, Studio will gain the file-safety foundations they require: authoritative removal of obsolete project files and directories, detection of files modified outside Studio, and controlled reload handling so saving or changing branches cannot silently overwrite work.

Git will remain optional, and advanced operations such as cloning, pull/push, creating branches, stashing, merging, rebasing, and conflict resolution will stay in dedicated Git tools for this initial scope.