Musicbox needs to provide a default filename

[K20shores]

The -o option right now always needs a filename.

Only specifying a directory produces an error

:: music_box -o output/ -e FlowTube
Traceback (most recent call last):                                                                                                                                                                                                  
  File "/opt/homebrew/anaconda3/envs/musicbox/bin/music_box", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/opt/homebrew/anaconda3/envs/musicbox/lib/python3.12/site-packages/acom_music_box/main.py", line 161, in main
    result = myBox.solve(musicBoxOutputPath)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/anaconda3/envs/musicbox/lib/python3.12/site-packages/acom_music_box/music_box.py", line 238, in solve
    raise ValueError(f"Invalid output path: '{output_path}' does not contain a filename.")
ValueError: Invalid output path: 'output/' does not contain a filename.

Acceptance criteria

• All of these commands work
  • music_box -o output/ -e FlowTube
  • music_box -o output.csv -e FlowTube
  • music_box -o output/results.csv -e FlowTube

Ideas

• Provide a default output filename in the argparse declaration
  

  music-box/src/acom_music_box/main.py

  Lines 32 to 36 in b49fe13

  	parser.add_argument(
  	'-o', '--output',
  	type=str,
  	help='Path to save the output file, including the file name. If not provided, result will be printed to the console.'
  	)

• Likely will need to modify the output code, which we should maybe remove from the the solve function
  

  music-box/src/acom_music_box/music_box.py

  Lines 231 to 245 in b49fe13

  	if output_path is not None:
  	# Check if the output_path is a full path or just a file name
  	if os.path.dirname(output_path) == '':
  	# If output_path is just a filename, use the current directory
  	output_path = os.path.join(os.getcwd(), output_path)
  	elif not os.path.basename(output_path):
  	raise ValueError(f"Invalid output path: '{output_path}' does not contain a filename.")
  	# Ensure the directory exists
  	dir_path = os.path.dirname(output_path)
  	if dir_path and not os.path.exists(dir_path):
  	os.makedirs(dir_path, exist_ok=True)
  	df.to_csv(output_path, index=False)