HEIC thumbnails still need system libheif / heif-convert.
Video thumbnails need system ffmpeg (includes ffprobe for Live Photo detection).
Video playback uses mpv (required on macOS: brew install mpv). Do not use ffplay.
Stills use Preview on macOS; imv / nsxiv / feh / swayimg on Linux.
macOS binaries are unsigned (allow the app in System Settings → Privacy & Security if Gatekeeper blocks it).
The Linux binary is glibc, built on Ubuntu 24.04.
Full Changelog: v0.1.1...v0.1.2