fix(nix): build against pnpm 11

side note: you may also notice that I have removed the `github:` url for
nixpkgs this is because it save a massive 15mb, is faster and more
reliable than github
See also:
-
<https://nix.dev/manual/nix/stable/protocols/tarball-fetcher#lockable-http-tarball-protocol>
-
<http://web.archive.org/web/20250806225139/https://nix.dev/manual/nix/2.28/protocols/tarball-fetcher#lockable-http-tarball-protocol>

flake.lock

@@ -2,18 +2,15 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1775888245,
-        "narHash": "sha256-nwASzrRDD1JBEu/o8ekKYEXm/oJW6EMCzCRdrwcLe90=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "13043924aaa7375ce482ebe2494338e058282925",
-        "type": "github"
+        "lastModified": 1778672786,
+        "narHash": "sha256-Tf7q8/0aIwg4Btd/GUMNHXDTqlrWTr5o/vZ8euFUAQY=",
+        "rev": "eef00dfd8a712b34af845f9350bac681b1228bd1",
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixpkgs/nixpkgs-26.05pre997230.eef00dfd8a71/nixexprs.tar.xz?lastModified=1778672786&rev=eef00dfd8a712b34af845f9350bac681b1228bd1"
       },
       "original": {
-        "owner": "nixos",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
+        "type": "tarball",
+        "url": "https://channels.nixos.org/nixpkgs-unstable/nixexprs.tar.xz"
       }
     },
     "root": {

flake.nix

@@ -1,6 +1,6 @@
 {
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    nixpkgs.url = "https://channels.nixos.org/nixpkgs-unstable/nixexprs.tar.xz";
   };
 
   outputs =

frontend.nix

@@ -19,7 +19,7 @@ stdenvNoCC.mkDerivation (finalAttrs: {
   pnpmDeps = fetchPnpmDeps {
     inherit (finalAttrs) pname version src;
     fetcherVersion = 3;
-    hash = "sha256-E0S8dOaTOpY9m7Ft59tUQ6CLlLriWPE4WE1+S45vomY=";
+    hash = "sha256-qbmIAvE/3u/NB5x9bERCGQqwiDLkzjff3QchgR+ZDFs=";
   };
 
   nativeBuildInputs = [