Add submit confirmation popup and logout functionality

Added dependency injection for `AuthService`, `ReceiverAuthorizationService`, `PageDataService`, and `Logger` to enable their usage in the component. Introduced a "Submit" button in the UI to confirm the signing process and complete the workflow.

Implemented a `DxPopup` component to display a confirmation dialog when the "Submit" button is clicked. The popup includes a message about the successful signing of the document and asks the user to confirm whether to complete the process and log out.

Added state variables `_isLoggingOut` and `_submitConfirmVisible` to manage the popup visibility and logout process. Created `OpenSubmitConfirmPopup` to toggle the popup and `SubmitAndLogoutAsync` to handle the submission process, including logging out via `AuthService` and navigating to the login page.

Updated the `@code` block with the new state variables and methods for managing the submit and logout functionality.

EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeReceiverReportSignedPage.razor

@@ -9,6 +9,7 @@
 @using System.Security.Claims
 @inject NavigationManager Navigation
 @inject IJSRuntime JSRuntime
+@inject EnvelopeGenerator.Server.Client.Services.AuthService AuthService
 @inject EnvelopeGenerator.Server.Services.EnvelopeReceiverAuthorizationService ReceiverAuthorizationService
 @inject EnvelopeGenerator.Server.Services.EnvelopeReceiverPageDataService PageDataService
 @inject AppVersionService AppVersion
@@ -42,6 +43,20 @@
                         <div style="font-size: 0.9rem; font-weight: 600; color: #1f2937;">Signiertes Dokument</div>
                     }
                 </div>
+
+                @* Right: Submit button *@
+                <div style="flex: 0 0 auto;">
+                    <button class="pdf-toolbar__btn pdf-toolbar__btn--signature-change pdf-toolbar__btn--signature-change-active"
+                            @onclick="OpenSubmitConfirmPopup"
+                            disabled="@_isLoggingOut"
+                            title="Abschließen"
+                            style="flex-shrink: 0;">
+                        <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" fill="currentColor" viewBox="0 0 16 16">
+                            <path d="M13.854 3.646a.5.5 0 0 1 0 .708l-7 7a.5.5 0 0 1-.708 0l-3.5-3.5a.5.5 0 1 1 .708-.708L6.5 10.293l6.646-6.647a.5.5 0 0 1 .708 0z"/>
+                        </svg>
+                        <span class="pdf-toolbar__btn-text">Abschließen</span>
+                    </button>
+                </div>
             </div>
         </div>
     </div>
@@ -82,6 +97,53 @@
     </div>
 </div>
 
+@* Submit confirmation popup *@
+<DxPopup @bind-Visible="_submitConfirmVisible"
+         HeaderText="Unterschrift bestätigen"
+         Width="440px"
+         MaxWidth="95vw"
+         ShowFooter="true"
+         CloseOnOutsideClick="false"
+         ShowCloseButton="false"
+         CloseOnEscape="false">
+    <BodyContentTemplate>
+        <div style="display: flex; align-items: flex-start; gap: 1rem; padding: 0.5rem 0;">
+            <div style="flex-shrink: 0; width: 40px; height: 40px; background: #d1fae5; border-radius: 50%; display: flex; align-items: center; justify-content: center;">
+                <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" fill="#065f46" viewBox="0 0 16 16">
+                    <path d="M13.854 3.646a.5.5 0 0 1 0 .708l-7 7a.5.5 0 0 1-.708 0l-3.5-3.5a.5.5 0 1 1 .708-.708L6.5 10.293l6.646-6.647a.5.5 0 0 1 .708 0z"/>
+                </svg>
+            </div>
+            <div>
+                <p style="margin: 0 0 0.4rem; font-weight: 600; color: #1f2937; font-size: 0.95rem;">
+                    Dokument erfolgreich unterschrieben
+                </p>
+                <p style="margin: 0; color: #6b7280; font-size: 0.85rem; line-height: 1.5;">
+                    Ihre Unterschrift wurde auf dem Dokument platziert. Möchten Sie den Vorgang abschließen und sich abmelden?
+                </p>
+            </div>
+        </div>
+    </BodyContentTemplate>
+    <FooterContentTemplate>
+        <div class="d-flex gap-2 justify-content-end w-100" style="padding: 0.5rem 0;">
+            <button class="btn btn-outline-secondary"
+                    @onclick="() => _submitConfirmVisible = false"
+                    style="border-radius: 6px; padding: 0.5rem 1.25rem; font-weight: 500;">
+                Abbrechen
+            </button>
+            <button class="btn btn-primary"
+                    @onclick="SubmitAndLogoutAsync"
+                    disabled="@_isLoggingOut"
+                    style="background: linear-gradient(135deg, #059669 0%, #047857 100%); border: none; border-radius: 6px; padding: 0.5rem 1.5rem; font-weight: 600; box-shadow: 0 2px 4px rgba(5, 150, 105, 0.3);">
+                @if (_isLoggingOut)
+                {
+                    <span class="spinner-border spinner-border-sm me-1" role="status"></span>
+                }
+                Abschließen
+            </button>
+        </div>
+    </FooterContentTemplate>
+</DxPopup>
+
 @code {
     [Parameter] public string? EnvelopeKey { get; set; }
 
@@ -96,6 +158,24 @@
     XtraReport? _report;
     SignatureCaptureDto? _sig;
 
+    // ----- Submit / logout state -----
+    bool _isLoggingOut        = false;
+    bool _submitConfirmVisible = false;
+
+    void OpenSubmitConfirmPopup() => _submitConfirmVisible = true;
+
+    async Task SubmitAndLogoutAsync()
+    {
+        if (_isLoggingOut) return;
+        _isLoggingOut = true;
+        _submitConfirmVisible = false;
+        await InvokeAsync(StateHasChanged);
+        await AuthService.LogoutEnvelopeReceiverAsync(EnvelopeKey!);
+        Navigation.NavigateTo(
+            $"/envelope/login/{Uri.EscapeDataString(EnvelopeKey!)}",
+            forceLoad: true);
+    }
+
     protected override async Task OnInitializedAsync()
     {
         if (string.IsNullOrWhiteSpace(EnvelopeKey))