Feature: Display song body preview in the song list

[david]

As an Administrator, I want to see a preview of the song's body directly in the song list, so that I can quickly identify songs without having to click into the details.

Acceptance Criteria:

• The song list table should include a column that displays the first two lines of the song's body.
• If the body has fewer than two lines, it should display the entire body.
• If the body is empty, the column should be empty.