add gamescope and mangohud

flake.lock

···
         ]
       },
       "locked": {
-        "lastModified": 1765480374,
-        "narHash": "sha256-HlbvQAqLx7WqZFFQZ8nu5UUJAVlXiV/kqKbyueA8srw=",
+        "lastModified": 1765606130,
+        "narHash": "sha256-KOP4QnkiRwiD5KEOr6ceF67rfTP1OqPmCCft6xDC3k4=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "39cb677ed9e908e90478aa9fe5f3383dfc1a63f3",
+        "rev": "d787ec69c3216ea33be1c0424fe65cb23aa8fb31",
         "type": "github"
       },
       "original": {
···
         "xwayland-satellite-unstable": "xwayland-satellite-unstable"
       },
       "locked": {
-        "lastModified": 1765528203,
-        "narHash": "sha256-DTs3VkvRjW/Quu7y9hzNUrddysBXbcqv5Rpo4rtQYQI=",
+        "lastModified": 1765602747,
+        "narHash": "sha256-W/5L5akXAqacv6WznbJat3lfhP5jyPUWx5uhTk91kUY=",
         "owner": "sodiboo",
         "repo": "niri-flake",
-        "rev": "8f74fd85c7b42f2d06347a9c9eaff6d4904854f3",
+        "rev": "5c6cdc032e5b01e1aee5c6232c14e584f0e319e1",
         "type": "github"
       },
       "original": {
···
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1765536405,
-        "narHash": "sha256-HTHfcqG8WsrJG0aW3edXF5nQJK3VjPWcUTEi/r0LV7o=",
+        "lastModified": 1765567677,
+        "narHash": "sha256-DZkE/84gJexlWWSo4KJ/THSAYiB/wCZGZ6KbpOCTTnI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "27225de9f2030213246e0d8d62957c43d5229368",
+        "rev": "64ac22e04a59eb2f781b1eaa534d8305dceb9f60",
         "type": "github"
       },
       "original": {
···
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1765549401,
-        "narHash": "sha256-/7jUlBsI2DCm9LOF4upS7+kMYM4K78dPpHO5pCKYV6k=",
+        "lastModified": 1765577349,
+        "narHash": "sha256-LwN/XLnGxnjsG8JPdM0566C69q0j65kLVhxVYp/rYFU=",
         "owner": "nix-community",
         "repo": "nixvim",
-        "rev": "a80557e1425ad9438dde7652b12fd5a449df6f00",
+        "rev": "993a8b4eb0891b542bbfed026fb280ddb4d1b1c2",
         "type": "github"
       },
       "original": {

tundra/home.nix

···
       signal-desktop
       typst
       wl-clipboard
+      mangohud
+      gamescope
     ];
 
     stateVersion = "26.05";