Add export feature UI to EnvelopeSenderPage (placeholder)

Introduced a new export feature to the EnvelopeSenderPage, including a dropdown for selecting export formats (XLSX, CSV, PDF) and a checkbox to export only selected rows. Added a placeholder export button ("Exportieren") that is currently disabled, with export logic to be implemented in a future phase.

Added private fields `_selectedExportFormat` and `_exportSelectedRowsOnly` to manage the export state. Implemented `IsExportDisabled()` to control button availability and a placeholder method `ExportSelectedFormatPlaceholderAsync()`.

Updated `sender-page.css` to style the export feature, including the export button, dropdown, and checkbox. Added theme-specific styles for "purple" and "blazing-dark" themes. Adjusted toolbar element order to position the export group before the logout button.

EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeSenderPage.razor

@@ -104,6 +104,31 @@
                     Vorschau
                 </button>
 
+                <div class="sender-export-group" title="Export der aktuellen Tabellenansicht">
+                    <label class="sender-export-label" for="sender-export-format">Format</label>
+                    <select id="sender-export-format" class="sender-export-format" @bind="_selectedExportFormat" aria-label="Exportformat auswählen">
+                        <option value="xlsx">XLSX</option>
+                        <option value="csv">CSV</option>
+                        <option value="pdf">PDF</option>
+                    </select>
+
+                    <label class="sender-export-selected">
+                        <input type="checkbox" @bind="_exportSelectedRowsOnly" />
+                        <span>Nur ausgewählte</span>
+                    </label>
+
+                    <button class="sender-btn sender-btn--export"
+                            @onclick="ExportSelectedFormatPlaceholderAsync"
+                            disabled="@IsExportDisabled()"
+                            title="Export wird in Phase 2 aktiviert">
+                        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16">
+                            <path d="M.5 9.9a.5.5 0 0 1 .5.5V13a1 1 0 0 0 1 1h12a1 1 0 0 0 1-1v-2.6a.5.5 0 0 1 1 0V13a2 2 0 0 1-2 2H2a2 2 0 0 1-2-2v-2.6a.5.5 0 0 1 .5-.5z" />
+                            <path d="M5.354 6.146a.5.5 0 0 1 .707 0L7.5 7.586V.5a.5.5 0 0 1 1 0v7.086l1.439-1.44a.5.5 0 0 1 .707.708l-2.293 2.293a.5.5 0 0 1-.707 0L5.354 6.854a.5.5 0 0 1 0-.708z" />
+                        </svg>
+                        Exportieren
+                    </button>
+                </div>
+
                 <button class="sender-btn sender-btn--logout" @onclick="LogoutAsync" disabled="@_isLoggingOut" title="Abmelden">
                     @if (_isLoggingOut)
                     {
@@ -514,6 +539,10 @@
     private byte[]? _previewPdfBytes = null;
     private string? _previewErrorMessage = null;
 
+    // Phase 6e (step 1): UI state only. Export logic is added in step 2.
+    private string _selectedExportFormat = "xlsx";
+    private bool _exportSelectedRowsOnly = false;
+
     // Stable keys used to store/restore each grid's layout in UserPreferences.GridLayouts
     private const string GridKeyActive = "sender.active-envelopes";
     private const string GridKeyCompleted = "sender.completed-envelopes";
@@ -572,6 +601,19 @@
         await LoadEnvelopesAsync();
     }
 
+    bool IsExportDisabled()
+    {
+        if (_isLoading)
+            return true;
+
+        return _exportSelectedRowsOnly && _selectedEnvelope is null;
+    }
+
+    Task ExportSelectedFormatPlaceholderAsync()
+    {
+        return Task.CompletedTask;
+    }
+
     void CreateEnvelope()
     {
         Navigation.NavigateTo("/sender/editor");

EnvelopeGenerator.Server/EnvelopeGenerator.Server/wwwroot/css/sender-page.css

@@ -136,6 +136,59 @@
     min-width: 38px;
 }
 
+.sender-btn--export {
+    padding-inline: 0.875rem;
+}
+
+.sender-export-group {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.45rem;
+    padding: 0.35rem 0.5rem;
+    border: 1px solid rgba(126, 34, 206, 0.18);
+    border-radius: 10px;
+    background: rgba(126, 34, 206, 0.04);
+}
+
+.sender-export-label {
+    font-size: 0.72rem;
+    font-weight: 700;
+    color: #4b5563;
+    letter-spacing: 0.01em;
+    white-space: nowrap;
+}
+
+.sender-export-format {
+    height: 32px;
+    min-width: 84px;
+    padding: 0 0.5rem;
+    border: 1px solid rgba(126, 34, 206, 0.25);
+    border-radius: 8px;
+    background: #fff;
+    color: #1e293b;
+    font-size: 0.8rem;
+    font-weight: 600;
+    outline: none;
+}
+
+.sender-export-format:focus {
+    border-color: rgba(126, 34, 206, 0.55);
+    box-shadow: 0 0 0 2px rgba(126, 34, 206, 0.12);
+}
+
+.sender-export-selected {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.35rem;
+    font-size: 0.74rem;
+    color: #4b5563;
+    white-space: nowrap;
+}
+
+.sender-export-selected input[type="checkbox"] {
+    margin: 0;
+}
+
 .sender-content {
     flex: 1;
     min-height: 0;
@@ -314,6 +367,14 @@
         justify-content: flex-start;
     }
 
+    .sender-export-group {
+        order: 98;
+    }
+
+    .sender-btn--logout {
+        order: 99;
+    }
+
     .sender-title {
         font-size: 1.125rem;
     }
@@ -373,6 +434,20 @@
     box-shadow: 0 4px 12px rgba(147, 51, 234, 0.22);
 }
 
+[data-sf-theme="purple"] .sender-export-group {
+    border-color: rgba(147, 51, 234, 0.28);
+    background: rgba(147, 51, 234, 0.08);
+}
+
+[data-sf-theme="purple"] .sender-export-format {
+    border-color: rgba(147, 51, 234, 0.36);
+}
+
+[data-sf-theme="purple"] .sender-export-format:focus {
+    border-color: rgba(147, 51, 234, 0.6);
+    box-shadow: 0 0 0 2px rgba(147, 51, 234, 0.14);
+}
+
 [data-sf-theme="purple"] .sender-tabs {
     border-bottom-color: rgba(147, 51, 234, 0.12);
 }
@@ -445,6 +520,27 @@
     border-color: transparent;
 }
 
+[data-sf-theme="blazing-dark"] .sender-export-group {
+    border-color: rgba(129, 140, 248, 0.26);
+    background: rgba(99, 102, 241, 0.08);
+}
+
+[data-sf-theme="blazing-dark"] .sender-export-label,
+[data-sf-theme="blazing-dark"] .sender-export-selected {
+    color: rgba(255, 255, 255, 0.72);
+}
+
+[data-sf-theme="blazing-dark"] .sender-export-format {
+    background: rgba(255, 255, 255, 0.08);
+    color: rgba(255, 255, 255, 0.9);
+    border-color: rgba(129, 140, 248, 0.35);
+}
+
+[data-sf-theme="blazing-dark"] .sender-export-format:focus {
+    border-color: rgba(129, 140, 248, 0.58);
+    box-shadow: 0 0 0 2px rgba(129, 140, 248, 0.16);
+}
+
 [data-sf-theme="blazing-dark"] .sender-grid-container {
     background: rgba(15, 20, 40, 0.95);
     box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.06);