- DashcamScreen: LazyColumn of imported Pi videos with thumbnails (Coil),
file size, date, upload status, converting progress
- DashcamViewModel: Retrofit-backed video list + download to phone storage
+ delete local copy
- PiApi extended: listVideos, getVideoFile (streaming), getThumbnail, deleteVideo
- DTOs: VideoListResponse, VideoFile, ConvertProgress
- Bottom nav: Dashcam tab + Test tab
- Verified: video list loads from real Pi over yaris 911 hotspot