fix: fix corepack install command (remove bad input/stdin)

npm_install.py

@@ -2172,37 +2172,33 @@ def _build_frontend(src_frontend: Path, dest_frontend: Path):
             if shutil.which("corepack"):
                 try:
                     # Enable corepack
-                    result = subprocess.run(
+                    subprocess.run(
                         ["corepack", "enable"],
-                        input="",
-                        stdin=subprocess.PIPE,
                         capture_output=True,
                         timeout=10,
+                        check=False,
+                    )
+                    
+                    # Install Yarn stable (4.x)
+                    result = subprocess.run(
+                        ["corepack", "install", "-g", "yarn@stable"],
+                        capture_output=True,
+                        timeout=60,
                         text=True,
                         check=False,
                     )
                     
-                    if result.returncode == 0 or "already" in (result.stderr or "").lower():
-                        # Install Yarn stable (4.x)
-                        result = subprocess.run(
-                            ["corepack", "install", "-g", "yarn@stable"],
+                    if result.returncode == 0:
+                        # Activate it
+                        subprocess.run(
+                            ["corepack", "prepare", "yarn@stable", "--activate"],
                             capture_output=True,
-                            timeout=60,
-                            text=True,
+                            timeout=30,
                             check=False,
                         )
                         
-                        if result.returncode == 0:
-                            # Activate it
-                            subprocess.run(
-                                ["corepack", "prepare", "yarn@stable", "--activate"],
-                                capture_output=True,
-                                timeout=30,
-                                check=False,
-                            )
-                            
-                            # Check version
-                            if shutil.which("yarn"):
+                        # Check version
+                        if shutil.which("yarn"):
                                 major = _get_yarn_major_version(["yarn"])
                                 
                                 if major and major >= 4: