Fix Windows Unicode error in node commands (#277)

* Fix Windows Unicode error in node commands

Fixes UnicodeDecodeError when running `comfy node show all` on Windows by explicitly setting UTF-8 encoding with error handling for subprocess calls to ComfyUI-Manager.

The error occurred because Windows defaults to cp1252 encoding which cannot decode certain Unicode characters (byte 0x9d) output by ComfyUI-Manager scripts.

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

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

* Format.

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Co-authored-by: Claude <[email protected]>

Author: robinjhuang

comfy_cli/command/custom_nodes/cm_cli_util.py

@@ -57,7 +57,9 @@ def execute_cm_cli(args, channel=None, fast_deps=False, mode=None) -> str | None
     print(f"Execute from: {workspace_path}")
 
     try:
-        result = subprocess.run(cmd, env=new_env, check=True, capture_output=True, text=True)
+        result = subprocess.run(
+            cmd, env=new_env, check=True, capture_output=True, text=True, encoding="utf-8", errors="replace"
+        )
         print(result.stdout)
 
         if fast_deps and args[0] in _dependency_cmds: