Update build script to check dependencies instead of auto-installing

✅ SAFER BUILD PROCESS:
- Changed install_dependencies() to check_dependencies()
- No longer automatically installs PyQt6/pyinstaller
- Provides clear instructions if dependencies are missing
- User must manually install: pip install -r requirements.txt
- Added --check-deps option for dependency verification only

TECHNICAL DETAILS:
- More secure: doesn't modify user's Python environment
- Better control: user chooses when to install packages
- Clear feedback: shows which packages are missing
- Improved workflow: separates dependency management from building

USER WORKFLOW:
1. pip install -r requirements.txt (manual)
2. python3 build_usb_creator.py (checks deps then builds)
3. Executable created if all dependencies satisfied

build_usb_creator.py

@@ -11,23 +11,34 @@ import platform
 import shutil
 from pathlib import Path
 
-def install_dependencies():
-    """Install required Python packages"""
-    print("Installing required dependencies...")
+def check_dependencies():
+    """Check if required Python packages are installed"""
+    print("Checking required dependencies...")
     
     packages = [
         "PyQt6",
         "pyinstaller",
     ]
     
+    missing_packages = []
+    
     for package in packages:
         try:
-            subprocess.run([sys.executable, "-m", "pip", "install", package], check=True)
-            print(f"✓ {package} installed")
-        except subprocess.CalledProcessError:
-            print(f"✗ Failed to install {package}")
-            return False
+            __import__(package.lower().replace('-', '_'))
+            print(f"✓ {package} found")
+        except ImportError:
+            print(f"✗ {package} missing")
+            missing_packages.append(package)
+    
+    if missing_packages:
+        print("\nMissing dependencies found!")
+        print("Please install them manually:")
+        print(f"  pip3 install {' '.join(missing_packages)}")
+        print("Or install all dependencies with:")
+        print("  pip3 install -r requirements.txt")
+        return False
     
+    print("✓ All dependencies satisfied")
     return True
 
 def create_spec_file():
@@ -186,7 +197,7 @@ python3 build_usb_creator.py
 ### Manual Build:
 ```bash
 # Install dependencies
-pip install -r requirements.txt
+pip3 install -r requirements.txt
 
 # Build executable
 pyinstaller --clean usb_creator.spec
@@ -249,12 +260,12 @@ def main():
     print("MBetter USB Creator - Build Script")
     print("=" * 40)
     
-    if len(sys.argv) > 1 and sys.argv[1] == "--deps-only":
-        print("Installing dependencies only...")
-        if install_dependencies():
-            print("✓ Dependencies installed successfully")
+    if len(sys.argv) > 1 and sys.argv[1] == "--check-deps":
+        print("Checking dependencies only...")
+        if check_dependencies():
+            print("✓ All dependencies available")
         else:
-            print("✗ Failed to install dependencies")
+            print("✗ Missing dependencies found")
         return
     
     # Create build files
@@ -262,9 +273,9 @@ def main():
     create_spec_file()
     create_build_instructions()
     
-    # Install dependencies
-    if not install_dependencies():
-        print("✗ Failed to install dependencies. Aborting build.")
+    # Check dependencies
+    if not check_dependencies():
+        print("✗ Missing dependencies. Please install them before building.")
         return
     
     # Build executable
@@ -279,4 +290,4 @@ def main():
         print("✗ Check error messages above")
 
 if __name__ == '__main__':
-    main()
\ No newline at end of file
+    main()