Automatically scroll to highlighted section when viewing a quote

[flyblackbox]

Priority: Medium
Label: enhancement
Reference: Based on contributor feedback from @sjnass during design session

Description:
When a user clicks a quote (either from a comment or a separate post), the post page loads—but the view does not scroll to the quoted text highlighted automatically. This makes it harder to see what the quote references in context, especially on longer posts.

User Story:
As a user quoting text, I want my reader to be auto-scrolled to the original highlighted section, so they immediately understand what I was referencing without hunting for my reference.

Expected Behavior:

• The post page loads and scrolls smoothly to the correct highlightedSectionId
• If the ID is not found (e.g., due to data desync), fail gracefully and remain at top

[flyblackbox]

@SarahJoline you still down to tackle this one?