fix: correct JSON reporter syntax for Playwright tests

- Use proper syntax for JSON reporter with outputFile option
- Run separate commands for HTML and JSON report merging
- Specify output path directly in reporter configuration
- Ensures report.json is created in playwright-report directory

This fixes the "No such file or directory" error when trying to move
report.json file, as it wasn't being created in the first place.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/test-ui.yaml

@@ -229,10 +229,11 @@ jobs:
 
       - name: Run Playwright tests (${{ matrix.browser }})
         id: playwright
-        run: npx playwright test --project=${{ matrix.browser }} --reporter=html --reporter=json
+        run: |
+          npx playwright test --project=${{ matrix.browser }} \
+            --reporter=html \
+            --reporter='json:{"outputFile":"playwright-report/report.json"}'
         working-directory: ComfyUI_frontend
-        env:
-          PLAYWRIGHT_JSON_OUTPUT_NAME: playwright-report/report.json
 
       - uses: actions/upload-artifact@v4
         if: always()
@@ -278,12 +279,10 @@ jobs:
 
       - name: Merge into HTML Report
         run: |
-          npx playwright merge-reports --reporter html --reporter json ./all-blob-reports
-          # Move JSON report to the HTML report directory for easier access
-          [ -f "report.json" ] && mv report.json playwright-report/report.json
+          # Generate both HTML and JSON reports
+          npx playwright merge-reports --reporter html ./all-blob-reports
+          npx playwright merge-reports --reporter 'json:{"outputFile":"playwright-report/report.json"}' ./all-blob-reports
         working-directory: ComfyUI_frontend
-        env:
-          PLAYWRIGHT_JSON_OUTPUT_NAME: report.json
 
       - name: Upload HTML report
         uses: actions/upload-artifact@v4