Add minified ESM build output

- Add p5.esm.min.js output to rollup config with terser minification
- Include p5.esm.min.js in package.json files field for npm publishing
- Follows existing pattern of hidden sourcemaps for minified builds

Author: nickswalker

package.json

@@ -90,6 +90,7 @@
     "lib/p5.min.js",
     "lib/p5.js",
     "lib/p5.esm.js",
+    "lib/p5.esm.min.js",
     "translations/**",
     "types/**"
   ],

rollup.config.mjs

@@ -89,7 +89,7 @@ rmSync("./dist", {
 });
 
 export default [
-  //// Unminified and ESM library build ////
+  //// Library builds (IIFE and ESM) ////
   {
     input: 'src/app.js',
     output: [
@@ -109,6 +109,25 @@ export default [
         plugins: [
           bundleSize('p5.esm.js')
         ]
+      },
+      {
+        file: './lib/p5.esm.min.js',
+        format: 'esm',
+        banner,
+        sourcemap: 'hidden',
+        plugins: [
+          terser({
+            compress: {
+              global_defs: {
+                IS_MINIFIED: true
+              }
+            },
+            format: {
+              comments: false
+            }
+          }),
+          bundleSize('p5.esm.min.js', true)
+        ]
       }
     ],
     treeshake: {