Speaker presentations should stack vertically, not side-by-side #179
Description
Problem
When a speaker has multiple presentations, the cards are laid out in a horizontal grid (side-by-side). This causes the title text to wrap aggressively and wastes vertical space — the cards become tall and narrow, making them hard to read.
Expected
Presentation cards on the speaker detail page should stack vertically (full-width, one per row) so titles and metadata are readable without excessive wrapping.
Screenshot
See attached.