feat(ui/templates): per-kind context menus + folder rename/delete

src/ScadaLink.CentralUI/Components/Pages/Design/Templates.razor

@@ -19,6 +19,28 @@
     <ToastNotification @ref="_toast" />
     <ConfirmDialog @ref="_confirmDialog" />
 
+    @if (_showRenameFolderDialog)
+    {
+        <div class="modal show d-block" tabindex="-1" style="background: rgba(0,0,0,0.4);">
+            <div class="modal-dialog modal-sm">
+                <div class="modal-content">
+                    <div class="modal-header">
+                        <h6 class="modal-title">Rename Folder</h6>
+                        <button type="button" class="btn-close" @onclick="() => _showRenameFolderDialog = false"></button>
+                    </div>
+                    <div class="modal-body">
+                        <input class="form-control form-control-sm" @bind="_renameFolderName" />
+                        @if (_renameFolderError != null) { <div class="text-danger small mt-1">@_renameFolderError</div> }
+                    </div>
+                    <div class="modal-footer">
+                        <button class="btn btn-outline-secondary btn-sm" @onclick="() => _showRenameFolderDialog = false">Cancel</button>
+                        <button class="btn btn-primary btn-sm" @onclick="SubmitRenameFolder">Save</button>
+                    </div>
+                </div>
+            </div>
+        </div>
+    }
+
     @if (_loading)
     {
         <LoadingSpinner IsLoading="true" />
@@ -469,10 +491,85 @@
         // Folder selection: no-op (Section 4 design — folder click does not load detail).
     }
 
-    private RenderFragment RenderNodeContextMenu(TmplNode node) => __builder => { };
+    private RenderFragment RenderNodeContextMenu(TmplNode node) => __builder =>
+    {
+        switch (node.Kind)
+        {
+            case TmplNodeKind.Folder:
+                <button class="dropdown-item" @onclick="() => OpenNewFolderDialog(node.EntityId)">New Folder</button>
+                <button class="dropdown-item" @onclick="() => OpenNewTemplateDialog(node.EntityId)">New Template</button>
+                <button class="dropdown-item" @onclick="() => OpenRenameFolderDialog(node.EntityId, node.Label)">Rename</button>
+                <div class="dropdown-divider"></div>
+                <button class="dropdown-item text-danger" @onclick="() => DeleteFolder(node.EntityId, node.Label)">Delete</button>
+                break;
+
+            case TmplNodeKind.Template:
+                <button class="dropdown-item" @onclick="() => SelectTemplate(node.EntityId)">Edit</button>
+                <button class="dropdown-item" @onclick="() => OpenMoveTemplateDialog(node.EntityId, node.Label)">Move to Folder…</button>
+                <div class="dropdown-divider"></div>
+                <button class="dropdown-item text-danger" @onclick="() => DeleteTemplate(node.Template!)">Delete</button>
+                break;
+
+            case TmplNodeKind.Composition:
+                var composedKey = $"t:{node.Composition!.ComposedTemplateId}";
+                <button class="dropdown-item" @onclick="() => OnTreeNodeSelected(composedKey)">Open composed template</button>
+                <button class="dropdown-item text-danger" @onclick="() => DeleteComposition(node.Composition)">Remove composition</button>
+                break;
+        }
+    };
 
     private void OpenNewFolderDialog(int? parentFolderId) { /* Task 17 */ }
     private void OpenNewTemplateDialog(int? parentFolderId) { /* Task 17 */ }
+    private void OpenMoveTemplateDialog(int templateId, string label) { /* Task 17 */ }
+
+    // Rename folder dialog state
+    private bool _showRenameFolderDialog;
+    private int _renameFolderId;
+    private string _renameFolderName = string.Empty;
+    private string? _renameFolderError;
+
+    private void OpenRenameFolderDialog(int folderId, string currentName)
+    {
+        _renameFolderId = folderId;
+        _renameFolderName = currentName;
+        _renameFolderError = null;
+        _showRenameFolderDialog = true;
+    }
+
+    private async Task SubmitRenameFolder()
+    {
+        _renameFolderError = null;
+        var user = await GetCurrentUserAsync();
+        var result = await TemplateFolderService.RenameFolderAsync(_renameFolderId, _renameFolderName.Trim(), user);
+        if (result.IsSuccess)
+        {
+            _showRenameFolderDialog = false;
+            _toast.ShowSuccess("Folder renamed.");
+            await LoadTemplatesAsync();
+        }
+        else
+        {
+            _renameFolderError = result.Error;
+        }
+    }
+
+    private async Task DeleteFolder(int folderId, string label)
+    {
+        var confirmed = await _confirmDialog.ShowAsync($"Delete folder '{label}'?", "Delete Folder");
+        if (!confirmed) return;
+
+        var user = await GetCurrentUserAsync();
+        var result = await TemplateFolderService.DeleteFolderAsync(folderId, user);
+        if (result.IsSuccess)
+        {
+            _toast.ShowSuccess($"Folder '{label}' deleted.");
+            await LoadTemplatesAsync();
+        }
+        else
+        {
+            _toast.ShowError(result.Error);
+        }
+    }
 
     private async Task DeleteTemplate(Template template)
     {