Add folder and zip drag-drop strategy import with summaries

- Import dropped folders, nested zips, and .ica files into current folder context
- Preserve nested folder hierarchy and continue on partial import failures
- Show one toast summary for skipped/unsupported/newer-version items
- Bump app version to 3.3.5+51 and add import coverage tests
ec10d1352bDara Adedeji committed on 3/12/2026, 2:35:41 AMparent7cb1ee0
8 files changedLine totals unavailable