fix(frontend): disable the per-cell result download when result export is switched off

frontend/src/app/workspace/component/result-panel/result-table-frame/result-table-frame.component.html

@@ -198,7 +198,8 @@ <h5 class="rightAlign"><span [innerHTML]="compare(column.header, 'other')"></spa
               nz-button
               nzType="link"
               class="download-button"
-              title="Download data">
+              [disabled]="!exportEnabled"
+              [title]="exportEnabled ? 'Download data' : 'Result export is disabled on this deployment'">
               <i
                 nz-icon
                 nzType="cloud-download"></i>

frontend/src/app/workspace/component/result-panel/result-table-frame/result-table-frame.component.scss

@@ -115,6 +115,16 @@ th.header-size {
     font-size: 16px; // Slightly larger to match the cloud icon
     color: #1890ff; // Ant Design's primary blue color
   }
+
+  // Disabled when result export is switched off. The icon color and cursor above are
+  // hardcoded, so without this the disabled button would look exactly like the live one.
+  &[disabled] {
+    cursor: not-allowed;
+
+    i {
+      color: rgba(0, 0, 0, 0.25); // Ant Design's disabled text color
+    }
+  }
 }
 
 .table-row-hover:hover {

frontend/src/app/workspace/component/result-panel/result-table-frame/result-table-frame.component.spec.ts

@@ -31,6 +31,7 @@ import { By, DomSanitizer } from "@angular/platform-browser";
 import { of, Subject } from "rxjs";
 import { commonTestProviders } from "../../../../common/testing/test-utils";
 import { GuiConfigService } from "../../../../common/service/gui-config.service";
+import { MockGuiConfigService } from "../../../../common/service/gui-config.service.mock";
 import { isAudioUrl, isImageUrl, isVideoUrl } from "../../../../common/util/media-type.util";
 import {
   OperatorPaginationResultService,
@@ -696,6 +697,11 @@ describe("ResultTableFrameComponent", () => {
     });
 
     it("renders headers, per-column stats, and clickable row cells once results arrive", () => {
+      // The download click below must land on a live button: MockGuiConfigService ships with the
+      // export switch off, which would disable it.
+      (TestBed.inject(GuiConfigService) as unknown as MockGuiConfigService).setConfig({
+        exportExecutionResultEnabled: true,
+      });
       component.operatorId = "op1";
       component.setupResultTable([SAMPLE_ROW], 1);
       component.isFrontPagination = false;
@@ -741,11 +747,42 @@ describe("ResultTableFrameComponent", () => {
       expect(openSpy).toHaveBeenCalledWith(0, SAMPLE_ROW);
 
       const download = fixture.debugElement.query(By.css("button.download-button"));
+      expect((download.nativeElement as HTMLButtonElement).disabled).toBe(false);
       download.triggerEventHandler("click", { stopPropagation: vi.fn() });
       expect(downloadSpy).toHaveBeenCalledWith("alice", 0, 0, "name");
     });
   });
 
+  describe("per-cell download button and the export switch", () => {
+    // `commonTestProviders` supplies MockGuiConfigService (export switch off by default), so the
+    // switch is driven through it rather than through the `useValue` above.
+    function renderOneRow(exportEnabled: boolean): void {
+      (TestBed.inject(GuiConfigService) as unknown as MockGuiConfigService).setConfig({
+        exportExecutionResultEnabled: exportEnabled,
+      });
+      component.operatorId = "op1";
+      component.setupResultTable([SAMPLE_ROW], 1);
+      component.isFrontPagination = false;
+      fixture.detectChanges();
+    }
+
+    it("is enabled and offers a download when result export is on", () => {
+      renderOneRow(true);
+      const button = fixture.debugElement.query(By.css("button.download-button")).nativeElement as HTMLButtonElement;
+      expect(button.disabled).toBe(false);
+      expect(button.title).toBe("Download data");
+    });
+
+    it("is disabled and says why when result export is switched off", () => {
+      // The top menu and the context menu already honour the switch; before this the cell
+      // button rendered anyway and a click did nothing, with no request and no message.
+      renderOneRow(false);
+      const button = fixture.debugElement.query(By.css("button.download-button")).nativeElement as HTMLButtonElement;
+      expect(button.disabled).toBe(true);
+      expect(button.title).toBe("Result export is disabled on this deployment");
+    });
+  });
+
   it("should detect media URLs for result cells", () => {
     expect(component.isVideoCell("https://example.com/clip.mp4")).toBe(true);
     expect(component.isAudioCell("https://example.com/sound.wav")).toBe(true);

frontend/src/app/workspace/component/result-panel/result-table-frame/result-table-frame.component.ts

@@ -463,6 +463,16 @@ export class ResultTableFrameComponent implements OnInit, OnChanges {
     }));
   }
 
+  /**
+   * Result export is a deployment switch (`export-execution-result-enabled`). The top menu and
+   * the context menu already honour it; the per-cell download button did not -- it rendered
+   * regardless, and clicking it returned silently from the export service with no request and
+   * no message. Disable it here so the reader sees why nothing happens.
+   */
+  get exportEnabled(): boolean {
+    return this.guiConfigService.env.exportExecutionResultEnabled === true;
+  }
+
   downloadData(data: any, rowIndex: number, columnIndex: number, columnName: string): void {
     const realRowNumber = (this.currentPageIndex - 1) * this.pageSize + rowIndex;
     const defaultFileName = `${columnName}_${realRowNumber}`;