Show relevant highlighted portion in related post previews #141
Description
Description
Related post previews in the right panel currently show a generic preview. Instead, they should display the relevant/highlighted portion of the related post — the part that connects it to the main post.
Context
This is related to the substring highlighting feature. Once highlight data is available, the preview should center on the relevant excerpt rather than showing the beginning of the post.
Acceptance Criteria
- Related post previews show the relevant portion that connects to the main post
- The highlighted/relevant text is visually emphasized in the preview
- Falls back to a standard preview if no highlight data is available