prevent preview updates from overwriting drawings

frontend/vite.config.ts

@@ -19,19 +19,33 @@ const appVersion = process.env.VITE_APP_VERSION?.trim() || versionFromFile;
 const buildLabel = process.env.VITE_APP_BUILD_LABEL?.trim() || "local development build";
 
 // https://vite.dev/config/
-export default defineConfig({
-  plugins: [react()],
-  define: {
-    'import.meta.env.VITE_APP_VERSION': JSON.stringify(appVersion),
-    'import.meta.env.VITE_APP_BUILD_LABEL': JSON.stringify(buildLabel),
-  },
-  server: {
-    proxy: {
-      "/api": {
-        target: "http://localhost:8000",
-        changeOrigin: true,
-        rewrite: (path) => path.replace(/^\/api/, ""),
+export default defineConfig(({ command }) => {
+  const nodeEnv = process.env.NODE_ENV || (command === "build" ? "production" : "development");
+  const processEnvDefines = {
+    'process.env.IS_PREACT': JSON.stringify("false"),
+    'process.env.NODE_ENV': JSON.stringify(nodeEnv),
+  };
+
+  return {
+    plugins: [react()],
+    define: {
+      ...processEnvDefines,
+      'import.meta.env.VITE_APP_VERSION': JSON.stringify(appVersion),
+      'import.meta.env.VITE_APP_BUILD_LABEL': JSON.stringify(buildLabel),
+    },
+    optimizeDeps: {
+      esbuildOptions: {
+        define: processEnvDefines,
       },
     },
-  },
+    server: {
+      proxy: {
+        "/api": {
+          target: "http://localhost:8000",
+          changeOrigin: true,
+          rewrite: (path) => path.replace(/^\/api/, ""),
+        },
+      },
+    },
+  };
 });