Refactor: Implement trek-captcha generation

app/api/captcha/route.js

@@ -1,26 +1,20 @@
-import svgCaptcha from 'svg-captcha';
+import captcha from 'trek-captcha';
 import { NextResponse } from 'next/server';
 import crypto from 'crypto';
 
-// Prevent Next.js from evaluating this route at build time
 export const dynamic = 'force-dynamic';
 
 export async function GET() {
-    const captcha = svgCaptcha.create({
-        size: 5,
-        ignoreChars: '0o1i',
-        noise: 2,
-        color: true,
-        background: '#f3f4f6'
-    });
+    // Generate a 4-character alphanumeric captcha
+    const { token, buffer } = await captcha({ size: 4, style: -1 });
     
-    const text = captcha.text.toLowerCase();
+    const text = token.toLowerCase();
     const secret = process.env.CAPTCHA_SECRET || 'dev_secret_meow';
     const hash = crypto.createHmac('sha256', secret).update(text).digest('hex');
 
-    const response = new NextResponse(captcha.data, {
+    const response = new NextResponse(buffer, {
         headers: {
-            'Content-Type': 'image/svg+xml',
+            'Content-Type': 'image/gif',
             'Cache-Control': 'no-store, max-age=0'
         }
     });