`AssetPlugin::file_path = "../assets"` was set unconditionally to
make `cargo run -p solitaire_app` find the workspace-root assets
directory from inside `solitaire_app/`. On Android cargo-apk packages
the same directory into the APK at `assets/`, and Bevy's
AndroidAssetReader is already rooted there — prepending `../` walked
the reader out of the APK assets root and every load failed silently.
The cascade: CardImageSet handles were inserted but pointed at
non-existent paths, so `card_sprite` saw `Some(set)` but the textures
never resolved. The face-down branch then rendered with `Color::WHITE`
over a missing texture — which on hardware showed as the
`card_back_colour(0)` solid-red brick fallback that's *supposed* to
only fire under MinimalPlugins in tests.
Gates the `file_path` override behind
`#[cfg(not(target_os = "android"))]` so Android picks up the default
empty path. Closes P0 #3 of docs/android/PLAYABILITY_TODO.md.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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