Improve adaptiveness

Changes

• Avoids unusable scrollbars on mobile devices through ellipsize and wrapping labels
• Properly set width requests
• Enable swipes where possible
• Use row-activated instead of row-selected to avoid conflicts with Handy Leaflets
• Fix remaining time calculation

The addaptiveness can probably be improved further, but that's out of my league. However, the current patches are already a big improvement and make it completely usable on mobile devices such as the PinePhone (see screenshots).

Screenshots