Added full user authentication system: register/login with validation, bcrypt, reCAPTCHA integration, session handling, and new landing page with animated form switcher.

home.php

@@ -1,4 +1,12 @@
-<?php include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/header.php');
+<?php 
+session_start();
+
+if (!isset($_SESSION['user_id'])) {
+    header("Location: /landing.php");
+    exit();
+}
+
+include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/header.php');
 require_once($_SERVER['DOCUMENT_ROOT'] . '/db.php');
 $conn = getConnection();?>