Windows: ConvertTo-Json outputs True/False (invalid JSON) and UTF-16
BOM, corrupting tauri.conf.json. Switch to `node -e` which round-trips
JSON correctly.
Linux: linuxdeploy is itself an AppImage and cannot execute inside
Docker without FUSE. APPIMAGE_EXTRACT_AND_RUN=1 makes it self-extract
and run as a plain binary instead.
Also fix unreachable_code warning in check_for_update.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
jared
3be18b8e5d