Polish and performance
- New: Guest list sections can be collapsed.
- Fix: Crash on larger devices when sharing a PDF.
- Other: Major performance improvements to guest list and other editing.
- Other: Add spreadsheet as top-level export option.
- Other: Library panel makes room for placing floor item after selecting an item.
- Other: Guests can be tapped when editing an item to open the guest form.
- Other: UI polish on floor plan panel. Moved edit event as separate tab into panel.
- Other: Add weekly subscription option.