When dragging the floating screenshot preview into a room, iOS hands us
a provider whose `suggestedName` is e.g. `Screenshot 2026-05-22 at
14.49.40`. `NSString.pathExtension` returns `"40"`, so the previous
`!pathExtension.isEmpty` check treated the timestamp's trailing segment
as a real extension. The file got written without `.jpg`/`.png`, and the
`MediaUploadingPreprocessor` then fell back to `application/octet-stream`
which is why screenshots showed up as a "data" tile.
* MediaUploadingPreprocessor - Prevent images without any GPS metadata from being changed
* Add support for sending images
* Add support for sending video, audio and file attachments
* Rename MediaPickerPreview to MediaUploadPreview
* Move media uploading to the MediaUploadPreviewScreen, add waiting indicators and error handling
* Add support for pasting and drag&dropping in media for upload
* Adopt new media picker source UI, remove developer flag
* Set minimum heights for timeline loadable images
* Fix invalid camera picker file names
* Fix flakey MediaUploadingPreprocessor image tests, improve gps metadata stripping
* UITests: Update existing screenshots and add new step for the room attachment picker
* Switch all github action runners to macos-13
* Cleanup enter key and paste message composer handlers