Feature Request: Comment column in the playlist view (sortable)

[64kramsystem]

Describe
Cog reads the Comment tag (it shows in the Info Inspector), but the playlist view has no Comment column, so comments can't be displayed or sorted on in the playlist.

Expected behavior
An optional, sortable Comment column in the playlist view, like the other text columns.

This looks like a small change, since the groundwork already exists:

• The comment is already read and stored per entry (PlaylistEntry.comment, populated by the TagLib reader).
• It should just need a new NSTableColumn with identifier comment bound to the comment keypath, like the existing composer/genre columns — it would then pick up the existing show/hide-column header menu and the finderCompare: text sorting automatically.

Same shape as #318 (sample rate / bits-per-sample columns) and #410 (play count column), both implemented; the difference here is the field is already read, so it's only the column itself.

Version information:

• macOS version: 26.5.2 (25F84)
• Cog version: 3592

Additional context
Use case: a playlist whose tracks carry a category/level in the Comment tag, so it'd be handy to see and sort by it directly in the playlist.