Fix plugin loading type annotations and improve code readability

[hariomphulre]

Fix: Plugin loading with URL support

Issue: Plugin loading failed when using remote URLs due to Path normalization

Changes:

1. args.py: Pass plugin argument as string to preserve URL format
2. plugins.py:
   • Added urllib.error import for proper error handling
   • Updated _localize_path() to accept str | Path
   • Improved URL filename extraction using os.path.basename()
   • Added try-except for URL download errors
   • Updated load_plugin() to accept str | Path
   • Preserve URL strings throughout to avoid Path normalization

Impact:

• Users can now load plugins from remote URLs (https://, http://)
• Better error messages when downloads fail
• Cleaner separation between string URLs and filesystem paths

@codefiles

[hariomphulre]

Hello, anyone can review it plz... @svartkanin @codefiles @Torxed