Linux support is missing from the Rust/iced rewrite (README still advertises it)

[aweigold]

Summary

The current main (Rust + iced rewrite) targets only Windows and macOS — it does not compile for Linux. Meanwhile the README still advertises Linux downloads (AppImage/deb/rpm/Flatpak/AUR), and the "latest" Linux .deb on Releases is the old Flutter build (0.2.0+3), which has a black-window-on-reshow regression on X11 (window runs in the background, hidden after copy, re-shows black).

Details

• src/app.rs aliases the platform module only under cfg(windows) / cfg(macos); there is no Linux platform, so the crate fails to build on Linux.
• .github/workflows/ci.yml builds only Windows and macOS artifacts.
• src/config.rs stores config under %APPDATA%, which is unset on Linux (and macOS), silently falling back to the CWD.
• The README download table's Linux links resolve to the abandoned Flutter release.

Proposal

Add a Linux (X11) platform layer to the Rust rewrite so it builds and runs on Linux, and make config + launch-at-startup XDG-compliant. PR incoming.

Observed on: KDE Plasma / X11, flemozi 0.2.0+3 deb.