Verse/Quote: Text box selection by size

Currently text boxes on a slide have to have specific names for the slide generation to work.

For the verse and quote we could also determine these based on the size of the text box. The smaller text box would be the reference and the larger text box would be the body.

We should still prefer selecting by name if possible, but if no text boxes have the correct name we could fallback to size-based detection.

Locate the verse and quote slide-generation code that selects text boxes, then trace how named boxes are currently resolved. Verify the fallback behavior with differently sized boxes: named boxes remain preferred, while the smaller unnamed box becomes the reference and the larger becomes the body when no expected names are found.

Written by the indexing model from the issue text.