fix: improve test count extraction reliability in CI

- Use separate --reporter flags for list, html, and json
- Set PLAYWRIGHT_JSON_OUTPUT_NAME env var to specify JSON output path
- Run HTML and JSON report generation separately for merged reports
- Ensures report.json is created in playwright-report directory

The combined reporter syntax wasn't creating the JSON file properly.
Using separate reporter flags with env var ensures JSON is generated.

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

Co-Authored-By: Claude <[email protected]>

.github/workflows/test-ui.yaml

@@ -230,9 +230,12 @@ jobs:
       - name: Run Playwright tests (${{ matrix.browser }})
         id: playwright
         run: |
-          npx playwright test --project=${{ matrix.browser }} --reporter=html,json
-          # JSON report is saved to test-results.json by default, move it to the report directory
-          [ -f "test-results.json" ] && mv test-results.json playwright-report/report.json || true
+          # Run tests with both HTML and JSON reporters
+          PLAYWRIGHT_JSON_OUTPUT_NAME=playwright-report/report.json \
+          npx playwright test --project=${{ matrix.browser }} \
+            --reporter=list \
+            --reporter=html \
+            --reporter=json
         working-directory: ComfyUI_frontend
 
       - uses: actions/upload-artifact@v4
@@ -279,9 +282,11 @@ jobs:
 
       - name: Merge into HTML Report
         run: |
-          npx playwright merge-reports --reporter=html,json ./all-blob-reports
-          # JSON report is saved to test-results.json by default, move it to the report directory
-          [ -f "test-results.json" ] && mv test-results.json playwright-report/report.json || true
+          # Generate HTML report
+          npx playwright merge-reports --reporter=html ./all-blob-reports
+          # Generate JSON report separately with explicit output path
+          PLAYWRIGHT_JSON_OUTPUT_NAME=playwright-report/report.json \
+          npx playwright merge-reports --reporter=json ./all-blob-reports
         working-directory: ComfyUI_frontend
 
       - name: Upload HTML report