fix: add hyprwayland-scanner native paths for xdg-desktop-portal-hyprland cross-compile

flake.nix

@@ -123,6 +123,14 @@
                   # Qt6Quick missing from aarch64 qtdeclarative cross-compile;
                   # skip qtutils runtime deps — Hyprland only needs it for QML UI
                   hyprland = prev.hyprland.override { wrapRuntimeDeps = false; };
+                  # hyprwayland-scanner not found by cross pkg-config wrapper
+                  xdg-desktop-portal-hyprland = prev.xdg-desktop-portal-hyprland.overrideAttrs (old: {
+                    preConfigure = (old.preConfigure or "") + ''
+                      # Point cmake to the correct hyprwayland-scanner pkgconfig
+                      cmakeFlags="$cmakeFlags -Dhyprwayland-scanner_DIR=${prev.buildPackages.hyprwayland-scanner}/lib/cmake/hyprwayland-scanner" 2>/dev/null || true
+                      export PKG_CONFIG_PATH="${prev.buildPackages.hyprwayland-scanner}/lib/pkgconfig:$PKG_CONFIG_PATH"
+                    '';
+                  });
                 })
               ];
             }