Enhance authentication flow by adding return URL support

This commit updates the authentication process to include a return URL parameter, allowing users to be redirected back to their original page after logging in. Changes were made to the AuthController, Login component, and Routes component to handle the return URL appropriately. Additionally, improvements were made to the TeamScheduler and TeamSchedulerSolution classes for better team and student management. These enhancements improve user experience and navigation within the application.

WebApp/Components/Features/Authentication/Login.razor

@@ -32,6 +32,7 @@
             <input type="hidden" id="emailInput" name="email" value="" />
             <input type="hidden" id="passwordInput" name="password" value="" />
             <input type="hidden" id="rememberMeInput" name="rememberMe" value="" />
+            <input type="hidden" id="returnUrlInput" name="returnUrl" value="@_returnUrl" />
 
             <MudTextField @bind-Value="_loginModel.Email"
                           Label="Email"
@@ -75,6 +76,7 @@
     private MudInputType _passwordInput = MudInputType.Password;
     private string _passwordInputIcon = Icons.Material.Filled.VisibilityOff;
     private string _antiforgeryToken = string.Empty;
+    private string? _returnUrl;
 
     protected override void OnInitialized()
     {
@@ -86,13 +88,17 @@
             _antiforgeryToken = tokenSet.RequestToken ?? string.Empty;
         }
 
-        // Check for error message from query parameter (set by controller on failed login)
+        // Check for error message and returnUrl from query parameters
         var uri = new Uri(Navigation.Uri);
         var queryParams = QueryHelpers.ParseQuery(uri.Query);
         if (queryParams.TryGetValue("error", out var errorValue))
         {
             _errorMessage = errorValue.ToString();
         }
+        if (queryParams.TryGetValue("returnUrl", out var returnUrlValue))
+        {
+            _returnUrl = returnUrlValue.ToString();
+        }
     }
 
     private class LoginModel
@@ -141,10 +147,12 @@
     private async Task HandleFormSubmit()
     {
         // Update hidden inputs with current model values, then submit the form
+        var returnUrlValue = string.IsNullOrEmpty(_returnUrl) ? "" : System.Text.Json.JsonSerializer.Serialize(_returnUrl);
         await JS.InvokeVoidAsync("eval", $@"
             document.getElementById('emailInput').value = {System.Text.Json.JsonSerializer.Serialize(_loginModel.Email)};
             document.getElementById('passwordInput').value = {System.Text.Json.JsonSerializer.Serialize(_loginModel.Password)};
             document.getElementById('rememberMeInput').value = '{_loginModel.RememberMe.ToString().ToLower()}';
+            document.getElementById('returnUrlInput').value = {returnUrlValue};
             document.getElementById('loginForm').submit();
         ");
     }