Improve planning table on mobile

The planning table is too wide on mobile, requiring constant horizontal scrolling if you want to fill in your availability. The activity name and bartenders columns could wrap or truncate to reduce the table width.

Start by locating the planning table entry point and its mobile rendering styles or components. Check the table at narrow viewport widths, then adjust the activity name and bartenders columns so availability can be entered without constant horizontal scrolling, using wrapping or truncation as appropriate.

Written by the indexing model from the issue text.