As a Commons user, I want to be able to filter search results by file type so I can narrow results down to only the file type I want.
Acceptance Criteria:
- A "File Type" filter is added that allows users to only see results of a specific file type
- The file type filter should only appear on the Images, Audio, Video, and Other tabs (the Other tab is out of scope for this ticket - will be handled in T257699)
- The file type filter should have the following options:
- On the Images tab: tiff, png, gif, jpg, webp, xcf, svg
- On the Audio tab: mid, flac, wav, mp3, ogg
- On the Video tab: webm, mpg, ogv (this should have the display label 'ogv' but the value 'ogg')
- On the Other tab: pdf, djvu, stl
- The file type filter should match the following design on desktop. This task does not cover the mobile UI (this will be done as part of T258615)