Added steam and flatpak modules. Fixed steam with impermanence

flake.lock

@@ -768,6 +768,22 @@
         "type": "github"
       }
     },
+    "nix-flatpak": {
+      "locked": {
+        "lastModified": 1734128415,
+        "narHash": "sha256-HLwdVNxpuTsLlM3tCkpbQU6yCehdgf3kOS1G2SDlkzY=",
+        "owner": "gmodena",
+        "repo": "nix-flatpak",
+        "rev": "8bdc2540da516006d07b04019eb57ae0781a04b3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "gmodena",
+        "ref": "latest",
+        "repo": "nix-flatpak",
+        "type": "github"
+      }
+    },
     "nix-formatter-pack": {
       "inputs": {
         "nixpkgs": [
@@ -3213,6 +3229,7 @@
         "impermanence": "impermanence",
         "neovim": "neovim",
         "nix-darwin": "nix-darwin",
+        "nix-flatpak": "nix-flatpak",
         "nix-gaming": "nix-gaming",
         "nix-on-droid": "nix-on-droid",
         "nixos-facter-modules": "nixos-facter-modules",