[Feature] [Breakdown] Move element category separator cells before the elements, in exported spreadsheet

[hyuri]

Issue

In the exported breakdown spreadsheet, the element category cells that separate the elements are placed after the elements.

| Hose | Gun | Knife | Spoon | Fork | PROPS | Antique Room | 1980s Kitchen | Teen Bedroom | SET DRESSING |

This is very confusing, considering the spreadsheet is read from left-to-right, since don't know which category the elements belong to until we get to the end of the list. Some elements are obvious to guess, but some are not, and, in production, we want to take guesswork out of the equation, and we want to be able to quickly scan the document and understand what belongs to what right away.

Proposals

I have two suggestions:

Suggestion 1: Move the category cells to the beginning, before the list of elements that belong to that category:
| PROPS | Hose | Gun | Knife | Spoon | Fork | SET DRESSING | Antique Room | 1980s Kitchen | Teen Bedroom |

Suggestion 2: Move the category cells to an overall cell above the elements:

| PROPS                             | SET DRESSING                                |
| Hose | Gun | Knife | Spoon | Fork | Antique Room | 1980s Kitchen | Teen Bedroom |