fix: force UTF-8 stdout on Windows to handle Unicode

Author: nikolay-e

src/treemapper/treemapper.py

@@ -3,6 +3,9 @@
 
 
 def main() -> None:
+    # Force UTF-8 for stdout on Windows (default cp1252 can't handle Unicode)
+    if sys.platform == "win32" and hasattr(sys.stdout, "reconfigure"):
+        sys.stdout.reconfigure(encoding="utf-8")
     from .cli import parse_args
     from .clipboard import ClipboardError, copy_to_clipboard
     from .ignore import get_ignore_specs