Gander 1.1

Fixes and formats from real-device feedback: toolbar no longer sits under display cutouts (edge-to-edge insets), sideways photos display upright (EXIF), Markdown renders as formatted HTML, and video/audio playback lands via Media3 ExoPlayer (MP4, MKV, WebM, MOV, 3GP, AVI, FLV, TS + MP3, M4A, FLAC, WAV, OGG, Opus).