Fix song list mouse hitboxes and tag refresh

[dgruss]

This PR fixes mouse interaction and tag rendering issues in the song selection screen.

• Uses the themed list row element for list-view mouse hover hitboxes, so hovering anywhere on a song row focuses that song.
• Routes roulette and chessboard song hit testing through the same helper for consistent behavior.
• Ensures list row tags are populated immediately on show, avoiding delayed video/medley/duet/rap tag display or incorrect flashing of these tags.
• Shows the R->F tag for shown rap songs only when rap-to-freestyle is enabled.

Fixes #1270. (the other part has been fixed already)

[dgruss]

if this is merged #1270 can be closed