'a' in the Browser Artist tab should advance to the next item, as it does in the Song tab

[xxxserxxx]

UI behavior consistency. Currently, 'a' on an item in the Browser Artist tab adds children items to the Queue, but the cursor stays on the artist. Change this to advance to the next artist on press.

[spezifisch]

This will get fixed with #31 which is the main thing I'm working right now.

Current planned format to handle this in the new keybindings is:

[context.Browser]
a = "addArtistToQueue; cursorDown"

See https://github.com/spezifisch/tview-command/blob/79a67cc37b3b1ce86206b34adeed3d4deeb75e65/example.toml#L65

[xxxserxxx]

I'm going to close this as a dupe of #31.