feat(kodi): replace stremio with stremio-linux-shell and add scale factor support

Migrate from Qt-based stremio to Rust/CEF-based stremio-linux-shell.
Add stremioScaleFactor option (uses --force-device-scale-factor) for
4K TV display scaling. Set to 2.0 on boxy and gym-box.

roles/kodi/default.nix

@@ -19,6 +19,11 @@ in
       default = null;
       description = "Scale factor for Jellyfin Media Player UI (e.g., 1.5 for 150% scaling)";
     };
+    stremioScaleFactor = mkOption {
+      type = types.nullOr types.float;
+      default = null;
+      description = "Scale factor for Stremio UI via --force-device-scale-factor (e.g., 2 for 200% scaling)";
+    };
     appLauncherServer = {
       enable = mkOption {
         type = types.bool;
@@ -64,6 +69,28 @@ in
         '';
       }
       else pkgs.qt-pinned.jellyfin-media-player;
+
+    stremioPkg =
+      if cfg.stremioScaleFactor != null
+      then pkgs.symlinkJoin {
+        name = "stremio-scaled";
+        paths = [ pkgs.stremio-linux-shell ];
+        nativeBuildInputs = [ pkgs.makeWrapper ];
+        postBuild = ''
+          mkdir -p $out/bin
+          rm -f $out/bin/stremio
+          makeWrapper ${pkgs.stremio-linux-shell}/bin/stremio $out/bin/stremio \
+            --add-flags "--force-device-scale-factor=${toString cfg.stremioScaleFactor}"
+
+          # Update .desktop file to include scale factor
+          mkdir -p $out/share/applications
+          rm -f $out/share/applications/com.stremio.Stremio.desktop
+          substitute ${pkgs.stremio-linux-shell}/share/applications/com.stremio.Stremio.desktop \
+            $out/share/applications/com.stremio.Stremio.desktop \
+            --replace-fail "Exec=stremio" "Exec=stremio --force-device-scale-factor=${toString cfg.stremioScaleFactor}"
+        '';
+      }
+      else pkgs.stremio-linux-shell;
   in mkIf cfg.enable
     {
       users.extraUsers.kodi = {
@@ -80,12 +107,13 @@ in
         firefox
         jellyfinMediaPlayerPkg
         kodiPkg
-        qt-pinned.stremio
+        stremioPkg
+        # qt-pinned.stremio  # Replaced by stremio-linux-shell (Rust/CEF-based)
         wget
       ] ++ optional cfg.appLauncherServer.enable pkgs.custom.app-launcher-server;
 
       nixpkgs.config.permittedInsecurePackages = lib.warn
-        "Allowing insecure package qtwebengine-5.15.19 as a jellyfin-media-player/stremio dependency. These are pinned to nixpkgs-qt to avoid rebuilds - update that input separately when you have time."
+        "Allowing insecure package qtwebengine-5.15.19 as a jellyfin-media-player dependency. These are pinned to nixpkgs-qt to avoid rebuilds - update that input separately when you have time."
         [
           "qtwebengine-5.15.19"
         ];