Packets Explorer Page (#2012)

Basic for now, will be more beautiful later

- feat(app): add app-fetch-schema nix app
- chore(app): generate graphql schema
- feat(app): basic packets page

app/app.nix

@@ -41,6 +41,20 @@
             '';
           };
         };
+        app-fetch-schema = {
+          type = "app";
+          program = pkgs.writeShellApplication {
+            name = "app-dev-server";
+            runtimeInputs = combinedDeps;
+            text = ''
+              ${ensureAtRepositoryRoot}
+              cd app/
+              npx gql.tada generate-schema --tsconfig ./tsconfig.json --output "./src/generated/schema.graphql" --header "X-Hasura-Role:app" "https://graphql.union.build/v1/graphql"
+
+              npx gql.tada generate-output --disable-preprocessing --tsconfig ./tsconfig.json --output ./src/generated/graphql-env.d.ts
+            '';
+          };
+        };
       };
     };
 }