feat: add workspace templates and tab visibility

internal/api/app.go

@@ -1735,6 +1735,14 @@ func (a *App) ListWorkspaces() ([]workspace.Workspace, string) {
 	return workspaces, ""
 }
 
+// ListWorkspaceTemplates returns selectable built-in workspace templates.
+func (a *App) ListWorkspaceTemplates() ([]workspace.WorkspaceTemplate, string) {
+	if a.workspace == nil {
+		return nil, "workspace not initialized"
+	}
+	return a.workspace.ListWorkspaceTemplates(), ""
+}
+
 // CreateWorkspace creates a top-level physical workspace folder.
 func (a *App) CreateWorkspace(name, templateID string) (workspace.Workspace, string) {
 	if a.workspace == nil {

internal/api/app_test.go

@@ -1448,6 +1448,25 @@ func TestWorkspaceAPIUsesTopLevelFoldersAndMetadataSnapshot(t *testing.T) {
 	}
 }
 
+func TestWorkspaceAPIListsSelectableTemplates(t *testing.T) {
+	app, vaultDir := newFilesTestApp(t, []string{"files.read"})
+	app.workspace = workspace.NewManager(vaultDir)
+	if err := app.workspace.Load(); err != nil {
+		t.Fatalf("workspace Load: %v", err)
+	}
+
+	templates, errStr := app.ListWorkspaceTemplates()
+	if errStr != "" {
+		t.Fatalf("ListWorkspaceTemplates: %s", errStr)
+	}
+	if len(templates) != 5 {
+		t.Fatalf("templates = %+v, want 5 selectable templates", templates)
+	}
+	if templates[0].ID != "default" || templates[1].ID != "project" || templates[4].ID != "minimal" {
+		t.Fatalf("template order = %+v", templates)
+	}
+}
+
 func TestWorkspaceAPIPublishesLifecycleEvents(t *testing.T) {
 	app, vaultDir := newFilesTestApp(t, []string{"files.read"})
 	app.workspace = workspace.NewManager(vaultDir)