Add an optional `$limit` parameter to `CommentPresenter::markdownBody()`
that truncates the comment body before rendering Markdown. The comment
partial now passes a default limit of 250 characters, preventing long
comments from dominating the layout. Unit tests cover rendering with and
without a limit.
Enhance the navigation with a modern floating glass design, new Browse and Community dropdown links, and improved theme/blur toggles that now handle multiple instances. Update dropdown components with rounded styling and support for wider widths, refine nav-link active states, and add navigation feature tests.
w33b