Please address the comments from this code review:

## Overall Comments
- In the `at_exit` hook you call `reporter.summary` twice (`puts reporter.summary if ... && reporter.summary`); consider assigning it to a local variable to avoid duplicate work and ensure consistent output if the method ever gains side effects.
- The summary string construction contains inline pluralization logic for both screenshots and failures; consider extracting a small helper (e.g., `pluralize(count, singular, plural = nil)`) to keep the method more readable and reduce duplication.

## Individual Comments

### Comment 1
<location path="test/unit/reporters/html_reporter_test.rb" line_range="165-174" />
<code_context>
+        assert_nil result
+      end
+
+      test "#summary returns screenshot count and status" do
+        reporter = HTML.new(output_path: @output_path)
+        reporter.record([build_passing_assertion("ok"), build_failing_assertion("fail")])
+        reporter.finalize
+
+        summary = reporter.summary
+        assert_includes summary, "1 failure"
+        assert_includes summary, "2 screenshots"
+        assert_includes summary, @output_path.to_s
+      end
+
</code_context>
<issue_to_address>
**suggestion (testing):** Add a test case for pluralizing the failures label (e.g. "2 failures")

This test verifies the singular failure text and plural screenshots. To fully cover `summary`, please add another example with at least two failing assertions so the summary must include `"2 failures"`. That way both branches of the failures pluralization logic are tested and protected against regressions.

```suggestion
      test "#summary returns screenshot count and status" do
        reporter = HTML.new(output_path: @output_path)
        reporter.record([build_passing_assertion("ok"), build_failing_assertion("fail")])
        reporter.finalize

        summary = reporter.summary
        assert_includes summary, "1 failure"
        assert_includes summary, "2 screenshots"
        assert_includes summary, @output_path.to_s
      end

      test "#summary pluralizes failures label for multiple failures" do
        reporter = HTML.new(output_path: @output_path)
        reporter.record([
          build_failing_assertion("first failure"),
          build_failing_assertion("second failure")
        ])
        reporter.finalize

        summary = reporter.summary
        assert_includes summary, "2 failures"
        assert_includes summary, "2 screenshots"
        assert_includes summary, @output_path.to_s
      end
```
</issue_to_address>