It would be useful if there was a way to sort the materials in the basement according to quantity

"to see what materials can be discarded to reduce the clutter otherwise you have to search for each item individually to know how much you have."

**todo:**
1. add to the API for fetching basement itmes a "sortBy" or "orderBy" parameter, which controls the sorting
2. if the PSP front-end has not been open-sourced yet, ask Ben to add the filter to the front end :P

Start by locating the API entry point that fetches basement items and inspect how its response is assembled. Add a sortBy or orderBy parameter that controls quantity sorting, then verify the returned materials are ordered correctly; if the PSP front end is open-sourced, check whether its filter also needs updating.

Written by the indexing model from the issue text.