fix: gracefully handle htmlmin parse errors instead of crashing build

Malformed HTML (e.g. unescaped quotes in iframe title attributes) caused
html-minifier-terser to throw a fatal parse error, killing the entire
Eleventy build. Now catches the error, logs a warning, and returns the
unminified content so the build completes.

eleventy.config.js

@@ -220,6 +220,7 @@ export default function (eleventyConfig) {
   // HTML minification — only during initial build, skip during watch rebuilds
   eleventyConfig.addTransform("htmlmin", async function (content, outputPath) {
     if (outputPath && outputPath.endsWith(".html") && process.env.ELEVENTY_RUN_MODE === "build") {
+      try {
         return await minify(content, {
           collapseWhitespace: true,
           removeComments: true,
@@ -228,6 +229,10 @@ export default function (eleventyConfig) {
           minifyCSS: false,
           minifyJS: false,
         });
+      } catch {
+        console.warn(`[htmlmin] Parse error in ${outputPath}, skipping minification`);
+        return content;
+      }
     }
     return content;
   });