chore: add dev shell and direnv support

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -44,6 +44,7 @@ upload
 .rollup.cache
 *.tsbuildinfo
 
+/.direnv
 /result
 .svelte-kit
 

flake.nix

@@ -258,6 +258,13 @@
         packages.server = server;
 
         packages.default = desktop;
+
+        devShells.default = pkgs.mkShell {
+          buildInputs = [
+            nodejs
+            pnpm
+          ];
+        };
       }
     );
 }