Fix color coding codice sorgente

frontend/src/AssistantMessage.jsx

@@ -5,6 +5,27 @@ import remarkGfm from "remark-gfm";
 import remarkMath from "remark-math";
 import rehypeKatex from "rehype-katex";
 
+// Prism.js per syntax highlight
+import Prism from "prismjs";
+import "prismjs/themes/prism.css";
+
+// Linguaggi base
+import "prismjs/components/prism-sql";
+import "prismjs/components/prism-javascript";
+import "prismjs/components/prism-css";
+import "prismjs/components/prism-json";
+import "prismjs/components/prism-markdown";
+import "prismjs/components/prism-csharp";
+import "prismjs/components/prism-lua";
+import "prismjs/components/prism-c";
+import "prismjs/components/prism-cpp";
+import "prismjs/components/prism-python";
+import "prismjs/components/prism-basic";
+import "prismjs/components/prism-javascript";
+
+// Aggiungo alias "vb" che punta a "vbnet"
+Prism.languages.vb = Prism.languages.vbnet;
+
 export default function AssistantMessage({
   content,
   theme,
@@ -94,6 +115,13 @@ function CodeWithCopy({ inline, className = "", children, ...props }) {
   const codeText = String(children).replace(/\n$/, "");
   const isFencedBlock = !inline && /^language-/.test(className);
 
+  // Evidenziazione con Prism
+  useEffect(() => {
+    if (isFencedBlock) {
+      Prism.highlightAll();
+    }
+  }, [codeText, isFencedBlock]);
+
   if (!isFencedBlock) {
     return (
       <code className={className} {...props}>
@@ -115,7 +143,7 @@ function CodeWithCopy({ inline, className = "", children, ...props }) {
   return (
     <div style={{ position: "relative" }}>
       <pre className={className} {...props} style={{ paddingRight: "2rem" }}>
-        <code>{codeText}</code>
+        <code className={className}>{codeText}</code>
       </pre>
       <button
         onClick={handleCopy}
@@ -127,7 +155,7 @@ function CodeWithCopy({ inline, className = "", children, ...props }) {
           background: "transparent",
           cursor: "pointer"
         }}
-	className="btn-copy"
+        className="btn-copy"
         title="Copy to clipboard"
       >
         📋