Edit tags in bulk through the Excel round trip

The Planning export now has a Tags column, and the import reads it back. So you can retag a few hundred orders in a spreadsheet and upload it, rather than opening them one at a time.

Tags are how a lot of shops regroup work: by panel run, by area, by whoever is picking it up next. Deciding to regroup meant editing every order by hand, which in practice meant not regrouping. One shop that wanted to reorganise their panel groupings had no way to do it at all.

The tag list in the app refreshes when the import finishes, so tags you created in the spreadsheet are ready to filter by straight away.