fix: SwayFX and Syncthingtray

Circumvents an upstream error that fails the sandbox for SwayFX due to
always requiring DRM device

Fix floating syncthingtray windows not showing due to recent versions
not setting app_id correctly

flake.nix

@@ -68,6 +68,11 @@
       url = github:NixOS/nixos-hardware/master;
     };
     
+    # dynamic library loading
+    nix-alien = {
+      url = github:thiagokokada/nix-alien;
+    };
+    
   };
 
   outputs = inputs@{
@@ -87,6 +92,7 @@
       nixpkgs-mautrix-signal,
       nix-gaming,
       nixos-hardware,
+      nix-alien,
       
       ...
   }: let
@@ -116,7 +122,15 @@
     # NixOS modules that can only be used on NixOS systems
     nixModules = [ stylix.nixosModules.stylix
                    ./profiles/common/nixos.nix
-                 ];
+                   # dynamic library loading
+                   ({ self, system, ... }: {
+                     environment.systemPackages = with self.inputs.nix-alien.packages.${system}; [
+                       nix-alien
+                     ];
+                     # needed for `nix-alien-ld`
+                     programs.nix-ld.enable = true;
+                     })
+                   ];
     
     # Home-Manager modules wanted on non-NixOS systems
     homeModules = [ stylix.homeManagerModules.stylix