fixed issue with login page.

app/api/auth/[...nextauth]/route.js

@@ -93,7 +93,29 @@ export function createToken(payload) {
 
 export function verifyToken(token) {
   try {
-    return jwt.verify(token, JWT_SECRET);
+    if (!token) return null;
+    const parts = token.split(".");
+    if (parts.length === 2) {
+      // Custom token verification
+      const [encodedData, signature] = parts;
+      const expectedSignature = Buffer.from(
+        `${encodedData}.${JWT_SECRET}`
+      ).toString("base64");
+      if (signature !== expectedSignature) {
+        console.error("Signature mismatch");
+        return null;
+      }
+      const data = JSON.parse(
+        Buffer.from(encodedData, "base64").toString("utf-8")
+      );
+      if (data.exp && data.exp < Math.floor(Date.now() / 1000)) return null;
+      return data;
+    } else if (parts.length === 3) {
+      // Standard JWT verification
+      return jwt.verify(token, JWT_SECRET);
+    } else {
+      throw new Error("Invalid token format");
+    }
   } catch (error) {
     console.error("Token verification error:", error);
     return null;