[Bug] Storyline header: RatingSummaryWithSeparator duplicates RatingSummary

[realproject7]

Problem

PR #794 introduced RatingSummaryWithSeparator which duplicates the query and render logic from the existing RatingSummary component. Any future rating display changes must be updated in two places.

Also: the separator dot between rating and view count is missing aria-hidden="true".

Solution

1. Refactor RatingSummaryWithSeparator to compose the existing RatingSummary (e.g. add an optional separator or children prop) instead of duplicating it
2. Add aria-hidden="true" to the decorative separator dot span

Acceptance Criteria

• Single source of truth for rating query + render logic
• Separator dot has aria-hidden="true"
• No visual changes

Branch

task/<issue>-rating-summary-dedup