Enable UISupportsDocumentBrowser to provide access to documents directory

When viewing the On iPhone folder in Files, iSH is only available through the Locations area and FileProvider extension. Enabling UISupportsDocumentBrowser in Info.plist would make the documents directory available as well. This provides another means of sharing data with other apps, and it seems that apps have more flexibility when accessing data through that On-iPhone interface than with the FileProvider extension, although I don't know the specifics. I'm not sure how it affects 'themes' or what else the Documents directory is used for, but it seems like the ability to download a theme file from Safari directly into the themes folder without requiring a mount wouldn't be a bad thing.

Start by locating the app's Info.plist and review how the FileProvider extension currently exposes the On iPhone folder in Files. Enable UISupportsDocumentBrowser, then verify that the documents directory is available through the On-iPhone interface and that existing themes behavior remains acceptable.

Written by the indexing model from the issue text.