fix: ship the plugin sdk and serialport in desktop builds

packaging/build/after-pack.cjs

@@ -2,6 +2,34 @@ const fs = require("fs");
 const path = require("path");
 const { chmodSpawnHelpers } = require("../../scripts/patch-node-pty.cjs");
 
+const repoRoot = path.resolve(__dirname, "..", "..");
+
+/**
+ * The SDK is a workspace package, so electron-builder skips it, yet core and
+ * every plugin import it at runtime. Ship its package.json and dist the way
+ * the Docker image does.
+ */
+function copyPluginSdk(resourcesDir, sdkDir = path.join(repoRoot, "packages", "plugin-sdk")) {
+  const target = path.join(
+    resourcesDir,
+    "app.asar.unpacked",
+    "node_modules",
+    "@termix",
+    "plugin-sdk",
+  );
+  const dist = path.join(sdkDir, "dist");
+  if (!fs.existsSync(dist)) {
+    throw new Error(`Plugin SDK is not built (${dist}). Run: npm run build:sdk`);
+  }
+  fs.rmSync(target, { recursive: true, force: true });
+  fs.mkdirSync(target, { recursive: true });
+  fs.copyFileSync(path.join(sdkDir, "package.json"), path.join(target, "package.json"));
+  fs.cpSync(dist, path.join(target, "dist"), { recursive: true });
+  return target;
+}
+
+exports.copyPluginSdk = copyPluginSdk;
+
 exports.default = async function afterPack(context) {
   const { targets, appOutDir } = context;
 
@@ -11,10 +39,6 @@ exports.default = async function afterPack(context) {
     fs.writeFileSync(markerPath, "");
   }
 
-  if (context.electronPlatformName === "win32") {
-    return;
-  }
-
   const resourcesDir =
     context.electronPlatformName === "darwin"
       ? path.join(
@@ -25,6 +49,12 @@ exports.default = async function afterPack(context) {
         )
       : path.join(appOutDir, "resources");
 
+  copyPluginSdk(resourcesDir);
+
+  if (context.electronPlatformName === "win32") {
+    return;
+  }
+
   const nodePtyDir = path.join(
     resourcesDir,
     "app.asar.unpacked",