Add auth redirect for logged-in users on login/register pages

- Check for authentication token on page load
- If user is already logged in, redirect to dashboard
- Prevents logged-in users from seeing login/register forms
- Applies to both login.html and register.html

frontend/public/login.html

@@ -264,6 +264,15 @@
 
 
     <!-- Scripts -->
+    <script>
+      // Check if user is already logged in and redirect
+      (function() {
+        const token = localStorage.getItem('edh-stats-token') || sessionStorage.getItem('edh-stats-token')
+        if (token) {
+          window.location.href = '/dashboard.html'
+        }
+      })()
+    </script>
     <script
       defer
       src="https://unpkg.com/alpinejs@3.x.x/dist/cdn.min.js"

frontend/public/register.html

@@ -712,12 +712,21 @@
        </div>
      </template>
 
-     <!-- Scripts -->
-     <script
-       defer
-       src="https://unpkg.com/alpinejs@3.x.x/dist/cdn.min.js"
-     ></script>
-     <script src="/js/auth.js"></script>
+      <!-- Scripts -->
+      <script>
+        // Check if user is already logged in and redirect
+        (function() {
+          const token = localStorage.getItem('edh-stats-token') || sessionStorage.getItem('edh-stats-token')
+          if (token) {
+            window.location.href = '/dashboard.html'
+          }
+        })()
+      </script>
+      <script
+        defer
+        src="https://unpkg.com/alpinejs@3.x.x/dist/cdn.min.js"
+      ></script>
+      <script src="/js/auth.js"></script>
 
      <script src="/js/footer-loader.js"></script>
    </body>