Add signature panel and layout updates for ReportViewer

Enhanced `ReportViewer.razor` with a new layout structure:
- Added `receiver-page-layout` with `receiver-signature-panel` and `receiver-viewer-wrapper` for better organization.
- Introduced a button to export signed PDFs, conditionally enabled based on `SignatureApplied`.
- Added a `DxPopup` for capturing signatures with a "Close" button.

Updated `MainLayout.razor` to remove unnecessary padding from `<article>`.

Refined `app.css`:
- Defined styles for `receiver-page-layout`, `receiver-signature-panel`, and `receiver-viewer-wrapper` to improve layout flexibility.
- Adjusted `article` to use flexbox and ensure hidden overflow.

EnvelopeGenerator.ReceiverUI/Pages/Index.razor

@@ -35,6 +35,6 @@
             return;
 
         await Task.Delay(1200);
-        NavigationManager.NavigateTo("/reportviewer");
+        NavigationManager.NavigateTo("/receiver");
     }
 }

EnvelopeGenerator.ReceiverUI/Pages/ReportDesigner.razor

@@ -1,4 +1,4 @@
-@page "/reportdesigner"
+@page "/sender"
 @using DevExpress.DataAccess.Json;
 @using EnvelopeGenerator.ReceiverUI.Services;
 

EnvelopeGenerator.ReceiverUI/Pages/ReportViewer.razor

@@ -1,4 +1,4 @@
-@page "/reportviewer/"
+@page "/receiver"
 @using System.Drawing
 @using DevExpress.Drawing
 @using DevExpress.Utils
@@ -17,6 +17,9 @@
 <link href="_content/DevExpress.Blazor.Themes/blazing-berry.bs5.min.css" rel="stylesheet" />
 <link href="_content/DevExpress.Blazor.Reporting.Viewer/css/dx-blazor-reporting-components.bs5.css" rel="stylesheet" />
 
+<div class="receiver-page-layout">
+
+<div class="receiver-signature-panel">
 <div class="card m-3">
     <div class="card-body">
         <h5 class="card-title">Unterschrift</h5>
@@ -38,6 +41,7 @@
         </div>
     </div>
 </div>
+</div>
 
 <DxPopup @bind-Visible="SignaturePopupVisible"
          HeaderText="Unterschrift erfassen"
@@ -82,6 +86,25 @@
             <canvas id="receiver-image-signature-pad" width="520" height="160" class="border rounded bg-white w-100" style="max-width: 520px;"></canvas>
         }
 
+
+        <div class="border-top mt-3 pt-3">
+            <p class="text-muted mb-2">Bitte geben Sie die folgenden Angaben ein. Das Datum wird automatisch hinzugefuegt.</p>
+            <div class="row g-2">
+                <div class="col-12 col-md-6">
+                    <label class="form-label" for="receiver-signer-name">Vor- und Nachname *</label>
+                    <input id="receiver-signer-name" class="form-control" value="@SignerFullName" @oninput="args => SignerFullName = args.Value?.ToString() ?? string.Empty" />
+                </div>
+                <div class="col-12 col-md-6">
+                    <label class="form-label" for="receiver-signer-position">Position</label>
+                    <input id="receiver-signer-position" class="form-control" value="@SignerPosition" @oninput="args => SignerPosition = args.Value?.ToString() ?? string.Empty" />
+                </div>
+                <div class="col-12 col-md-6">
+                    <label class="form-label" for="receiver-signature-place">Ort *</label>
+                    <input id="receiver-signature-place" class="form-control" value="@SignaturePlace" @oninput="args => SignaturePlace = args.Value?.ToString() ?? string.Empty" />
+                </div>
+            </div>
+        </div>
+
         @if(!string.IsNullOrWhiteSpace(PopupValidationMessage)) {
             <div class="text-danger mt-2">@PopupValidationMessage</div>
         }
@@ -95,9 +118,13 @@
     </FooterContentTemplate>
 </DxPopup>
 
+<div class="receiver-viewer-wrapper">
 @if(Report is not null) {
     <DxReportViewer @key="ViewerKey" @ref="reportViewer" Report="Report" RootCssClasses="w-100 h-100" />
 }
+</div>
+
+</div>
 
 @code {
     const string SignatureTabDraw = "draw";
@@ -125,6 +152,9 @@
     string ActiveSignatureTab = SignatureTabDraw;
     string TypedSignatureText = string.Empty;
     string TypedSignatureFont = "'Brush Script MT', cursive";
+    string SignerFullName = string.Empty;
+    string SignerPosition = string.Empty;
+    string SignaturePlace = string.Empty;
     int ViewerKey;
 
     protected override async Task OnInitializedAsync() {
@@ -195,6 +225,16 @@
     }
 
     async Task ApplySignatureAsync() {
+        if(string.IsNullOrWhiteSpace(SignerFullName)) {
+            PopupValidationMessage = "Bitte geben Sie Vor- und Nachname ein.";
+            return;
+        }
+
+        if(string.IsNullOrWhiteSpace(SignaturePlace)) {
+            PopupValidationMessage = "Bitte geben Sie den Ort ein.";
+            return;
+        }
+
         var signatureDataUrl = await GetActiveSignatureDataUrlAsync();
 
         if(string.IsNullOrWhiteSpace(signatureDataUrl)) {
@@ -204,7 +244,7 @@
 
         PopupValidationMessage = null;
         SignatureValidationMessage = null;
-        Report = CreateSignedReportInstance(signatureDataUrl);
+        Report = CreateSignedReportInstance(signatureDataUrl, SignerFullName.Trim(), SignerPosition.Trim(), SignaturePlace.Trim());
         SignatureApplied = true;
         SignaturePopupVisible = false;
         ViewerKey++;
@@ -242,13 +282,13 @@
             : PredefinedReports.ReportsFactory.GetReport("LargeDatasetReport");
     }
 
-    XtraReport CreateSignedReportInstance(string signatureDataUrl) {
+    XtraReport CreateSignedReportInstance(string signatureDataUrl, string signerFullName, string signerPosition, string signaturePlace) {
         var report = CreateReportInstance();
-        AddSignature(report, signatureDataUrl);
+        AddSignature(report, signatureDataUrl, signerFullName, signerPosition, signaturePlace);
         return report;
     }
 
-    static void AddSignature(XtraReport report, string signatureDataUrl) {
+    static void AddSignature(XtraReport report, string signatureDataUrl, string signerFullName, string signerPosition, string signaturePlace) {
         var imageBytes = Convert.FromBase64String(signatureDataUrl[(signatureDataUrl.IndexOf(',') + 1)..]);
         using var imageStream = new MemoryStream(imageBytes);
         var imageSource = new ImageSource(DXImage.FromStream(imageStream));
@@ -259,28 +299,53 @@
             report.Bands.Add(bottomMargin);
         }
 
-        bottomMargin.HeightF = Math.Max(bottomMargin.HeightF, 120F);
         RemoveExistingSignature(bottomMargin);
 
-        var signatureLabel = new XRLabel {
+        // Layout constants
-            Name = "receiverSignatureLabel",
+        const float sigX         = 390F;
-            Text = $"Empfaengerunterschrift - {DateTime.Now:g}",
+        const float sigWidth     = 230F;
-            BoundsF = new RectangleF(390F, 6F, 230F, 18F),
+        const float sigImgHeight = 70F;
-            Font = new DXFont("Open Sans", 8F, DXFontStyle.Bold),
+        const float infoHeight   = 65F;  // up to 4 lines at 8pt
-            ForeColor = System.Drawing.Color.FromArgb(73, 80, 87),
+        const float innerGap     = 5F;
-            TextAlignment = TextAlignment.MiddleLeft
+        const float bottomPad    = 6F;
-        };
+        const float defaultTopPad = 8F;
+        const float maxBandHeight = 210F;
+
+        float requiredHeight = defaultTopPad + sigImgHeight + innerGap + infoHeight + bottomPad;
+
+        // Grow band if needed, but cap at maxBandHeight to avoid overlapping page content
+        bottomMargin.HeightF = Math.Min(maxBandHeight, Math.Max(bottomMargin.HeightF, requiredHeight));
+
+        // If band is tighter than required, compress top padding so content still fits
+        float topPad = Math.Max(0F, bottomMargin.HeightF - bottomPad - infoHeight - innerGap - sigImgHeight);
+
+        float imageY = topPad;
+        float labelY = imageY + sigImgHeight + innerGap;
+
+        var signatureInformation = string.IsNullOrWhiteSpace(signerPosition)
+            ? $"Empfaengerunterschrift\n{signerFullName}\n{signaturePlace}, {DateTime.Now:d}"
+            : $"Empfaengerunterschrift\n{signerFullName}\n{signerPosition}\n{signaturePlace}, {DateTime.Now:d}";
 
         var signature = new XRPictureBox {
             Name = "receiverSignatureImage",
             ImageSource = imageSource,
-            BoundsF = new RectangleF(390F, 28F, 230F, 70F),
+            BoundsF = new RectangleF(sigX, imageY, sigWidth, sigImgHeight),
             Sizing = ImageSizeMode.ZoomImage,
             Borders = BorderSide.Bottom,
             BorderColor = System.Drawing.Color.FromArgb(73, 80, 87)
         };
 
-        bottomMargin.Controls.AddRange(new XRControl[] { signatureLabel, signature });
+        var signatureLabel = new XRLabel {
+            Name = "receiverSignatureLabel",
+            Text = signatureInformation,
+            Multiline = true,
+            BoundsF = new RectangleF(sigX, labelY, sigWidth, infoHeight),
+            Font = new DXFont("Open Sans", 8F, DXFontStyle.Regular),
+            ForeColor = System.Drawing.Color.FromArgb(73, 80, 87),
+            TextAlignment = TextAlignment.TopLeft
+        };
+
+        bottomMargin.Controls.AddRange(new XRControl[] { signature, signatureLabel });
     }
 
     static void RemoveExistingSignature(BottomMarginBand bottomMargin) {

EnvelopeGenerator.ReceiverUI/Shared/MainLayout.razor

@@ -2,16 +2,12 @@
 @inherits LayoutComponentBase
 
 <div class="page">
-    <div class="sidebar">
-        <NavMenu />
-    </div>
-
 <main>
         <div class="top-row px-4">
             <a href="https://docs.microsoft.com/aspnet/" target="_blank">About</a>
         </div>
 
-        <article class="content px-4">
+        <article class="content">
             @Body
         </article>
     </main>

EnvelopeGenerator.ReceiverUI/Shared/NavMenu.razor

@@ -22,12 +22,12 @@
         </div>
         *@
         <div class="nav-item px-3">
-            <NavLink class="nav-link" href="reportviewer">
+            <NavLink class="nav-link" href="receiver">
                 <span class="oi oi-plus" aria-hidden="true"></span> Empfänger-UI
             </NavLink>
         </div>
         <div class="nav-item px-3">
-            <NavLink class="nav-link" href="reportdesigner">
+            <NavLink class="nav-link" href="sender">
                 <span class="oi oi-plus" aria-hidden="true"></span> Umschlag-UI
             </NavLink>
         </div>

EnvelopeGenerator.ReceiverUI/wwwroot/css/app.css

@@ -12,6 +12,28 @@ html, body {
 
 article {
     height: calc(100vh - 70px);
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+    padding-left: 0 !important;
+    padding-right: 0 !important;
+}
+
+.receiver-page-layout {
+    display: flex;
+    flex-direction: column;
+    height: 100%;
+    overflow: hidden;
+}
+
+.receiver-signature-panel {
+    flex: 0 0 auto;
+}
+
+.receiver-viewer-wrapper {
+    flex: 1 1 0;
+    min-height: 0;
+    overflow: hidden;
 }
 
 .valid.modified:not([type=checkbox]) {