test(a2ui): use playground render preview for ui-judge tests

.github/actions/ui-judge-comment/README.md

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+# UI Judge Comment
+
+Creates or updates a pull request comment with `@lynx-js/ui-judge` results.
+
+The action expects JSON shaped as one `UiJudgeResult`, an array of results, or
+an object with a `results` array.
+
+```yaml
+permissions:
+  pull-requests: write
+
+steps:
+  - run: pnpm --filter @lynx-js/ui-judge test
+    env:
+      UI_JUDGE_RESULT_FILE: ${{ github.workspace }}/ui-judge-results.json
+
+  - uses: ./.github/actions/ui-judge-comment
+    with:
+      result-file: ui-judge-results.json
+```
+
+Example result payload:
+
+```json
+{
+  "results": [
+    {
+      "dimension": "visual-correctness",
+      "score": 5,
+      "steps": [],
+      "url": "http://127.0.0.1:3000/render.html?demo=recs"
+    }
+  ]
+}
+```
+
+Inputs:
+
+- `result-file`: path to a JSON result file.
+- `result-json`: inline JSON result payload. Use this instead of
+  `result-file`.
+- `pr-number`: pull request number. Defaults to the `pull_request` event.
+- `title`: comment heading. Defaults to `UI Judge`.
+- `marker`: hidden marker used to update a previous comment.
+- `update-existing`: update the previous marked comment. Defaults to `true`.
+- `dry-run`: print the comment body without calling the GitHub API.
+- `github-token`: token for the GitHub API. Defaults to `github.token`.

.github/actions/ui-judge-comment/action.yml

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+name: UI Judge Comment
+
+description: Create or update a pull request comment with @lynx-js/ui-judge results.
+
+inputs:
+  result-file:
+    description: Path to a JSON file containing a UiJudgeResult, an array of results, or an object with a results array.
+    required: false
+  result-json:
+    description: Inline JSON containing a UiJudgeResult, an array of results, or an object with a results array.
+    required: false
+  pr-number:
+    description: Pull request number. Defaults to the pull_request payload number.
+    required: false
+  title:
+    description: Heading shown in the pull request comment.
+    default: UI Judge
+    required: false
+  marker:
+    description: Hidden marker used to find and update the previous UI Judge comment.
+    default: <!-- ui-judge-comment -->
+    required: false
+  update-existing:
+    description: Update the previous marked comment instead of creating a new one.
+    default: "true"
+    required: false
+  dry-run:
+    description: Print the rendered comment without calling the GitHub API.
+    default: "false"
+    required: false
+  github-token:
+    description: Token used to create or update the pull request comment.
+    required: false
+
+outputs:
+  body:
+    description: The rendered pull request comment body.
+    value: ${{ steps.comment.outputs.body }}
+  comment-id:
+    description: The created or updated issue comment id.
+    value: ${{ steps.comment.outputs.comment-id }}
+  comment-url:
+    description: The created or updated issue comment URL.
+    value: ${{ steps.comment.outputs.comment-url }}
+
+runs:
+  using: composite
+  steps:
+    - uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5
+      with:
+        node-version: "22"
+        package-manager-cache: false
+    - name: Create or update UI Judge comment
+      id: comment
+      shell: bash
+      run: node "$GITHUB_ACTION_PATH/comment.mjs"
+      env:
+        INPUT_RESULT_FILE: ${{ inputs.result-file }}
+        INPUT_RESULT_JSON: ${{ inputs.result-json }}
+        INPUT_PR_NUMBER: ${{ inputs.pr-number }}
+        INPUT_TITLE: ${{ inputs.title }}
+        INPUT_MARKER: ${{ inputs.marker }}
+        INPUT_UPDATE_EXISTING: ${{ inputs.update-existing }}
+        INPUT_DRY_RUN: ${{ inputs.dry-run }}
+        INPUT_GITHUB_TOKEN: ${{ inputs.github-token }}
+        GITHUB_TOKEN: ${{ inputs.github-token || github.token }}