Add comprehensive diskpart debugging to identify script execution issues

- Show script content and file size in debug output
- Display exact diskpart command being executed
- Capture and display diskpart stdout and stderr
- Show diskpart exit code for better error analysis
- Use Windows ANSI (cp1252) encoding for better diskpart compatibility
- Should reveal why diskpart window remains blank and help identify the root cause

usb_creator_gui.py

@@ -363,10 +363,34 @@ exit
             self.status.emit("Formatting USB drive...")
             self.status.emit(f"Using script file: {script_path}")
             
-            # Always try script file approach first since user confirms file exists
-            result = subprocess.run([
-                'diskpart', '/s', script_path
-            ], capture_output=True, text=True, timeout=60)
+            # Add debugging - show script content and file info
+            try:
+                with open(script_path, 'r', encoding='cp1252') as debug_file:
+                    script_content = debug_file.read()
+                    self.status.emit(f"Script content ({len(script_content)} chars):")
+                    self.status.emit(script_content)
+            except Exception as e:
+                self.status.emit(f"Failed to read script for debugging: {e}")
+            
+            # Show full command being executed
+            diskpart_cmd = ['diskpart', '/s', script_path]
+            self.status.emit(f"Executing: {' '.join(diskpart_cmd)}")
+            
+            # Try script file approach
+            result = subprocess.run(
+                diskpart_cmd,
+                capture_output=True,
+                text=True,
+                timeout=60,
+                shell=False  # Ensure we're not using shell
+            )
+            
+            # Show diskpart output for debugging
+            self.status.emit(f"Diskpart exit code: {result.returncode}")
+            if result.stdout:
+                self.status.emit(f"Diskpart stdout: {result.stdout}")
+            if result.stderr:
+                self.status.emit(f"Diskpart stderr: {result.stderr}")
             
             # Clean up diskpart script
             try: