Split runtime node_modules into reusable layers

- Add shared installFlags support to the common Bun node_modules builder
- Factor base and desktop overlay node_modules derivations for reuse
- Reuse the new runtime node_modules outputs in desktop and server builds

packages/t3code-desktop/default.nix

@@ -29,7 +29,6 @@
 
   pname = "t3code-desktop";
   version = desktopPackageJson.version;
-
 in
   stdenv.mkDerivation (finalAttrs: {
     inherit pname version;
@@ -71,6 +70,42 @@ in
       '';
     };
 
+    runtimeNodeModules = common.mkNodeModules {
+      inherit (finalAttrs) pname version src;
+      outputHash = "sha256-q1xo2GiU3Ct4Sq5+qGsfXMI0ei1c5AXkdq0GaBWr1PI=";
+      installFlags = [
+        "--production"
+      ];
+      filters = [
+        "."
+        "./apps/desktop"
+        "./apps/server"
+        "./apps/web"
+        "./packages/client-runtime"
+        "./packages/contracts"
+        "./packages/effect-acp"
+        "./packages/effect-codex-app-server"
+        "./packages/shared"
+      ];
+      impureEnvVars =
+        lib.fetchers.proxyImpureEnvVars
+        ++ [
+          "GIT_PROXY_COMMAND"
+          "SOCKS_SERVER"
+        ];
+      extraNativeBuildInputs = [
+        gcc
+        gnumake
+        pkg-config
+        python3
+      ];
+      extraEnv = ''
+        export ELECTRON_SKIP_BINARY_DOWNLOAD=1
+        export PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=1
+        export npm_config_build_from_source=true
+      '';
+    };
+
     nativeBuildInputs = [
       asar
       bun
@@ -104,8 +139,10 @@ in
 
       bun run build:desktop
       node ${./build-nix-desktop-package.mjs} --output-dir packaged-app
-      cp -R node_modules packaged-app/node_modules
+      cp -R ${finalAttrs.runtimeNodeModules} packaged-app/node_modules
       chmod -R u+rwX packaged-app/node_modules
+      rm -rf packaged-app/node_modules/node-pty
+      cp -R node_modules/node-pty packaged-app/node_modules/
       patchShebangs packaged-app/node_modules
       find packaged-app/node_modules -xtype l -delete
       rm -rf packaged-app/node_modules/electron
@@ -132,9 +169,9 @@ in
         --set-default ELECTRON_FORCE_IS_PACKAGED 1 \
         --set-default ELECTRON_IS_DEV 0 \
         --prefix PATH : ${lib.makeBinPath [
-          git
-          xdg-utils
-        ]} \
+        git
+        xdg-utils
+      ]} \
         --add-flags "$out/share/${pname}/resources/app.asar"
 
       export out