Bug: Adds non-music files

[nicekiwi]

Describe
I accidentally dragged an angular project folder into cog and it added lots of non-music files from the node_modules files into the current playlist.

To Reproduce (delete if not applicable)
Steps to reproduce the behavior:

1. Drag a node_modules folder of non-music files into a playlist.

Expected behavior
Probably go slow while indexing the folder added, but then only add sound files it found, rather than all .gz, .map, .zip, .zvg, .idx files in the folder.

Screenshots

Version information:*

• macOS version: 14.6.1
• Cog version: 2859 (2859-gfcddcdce6)

Additional context
Add any other context about the issue here.