Enhance webmentions: add links/posts counts, show replies inline via CSS :target

[Copilot]

Webmention counts only showed replies, reposts, and likes; links and posts were missing. Individual webmention details were also not viewable at all.

Changes

_layouts/post.html

• Adds links and posts to the summary count line
• Makes the replies count a clickable anchor link; reposts/likes/links/posts remain plain text counts
• Adds a hidden replies detail section ({% webmention_replies %}) revealed via :target, with a no-JS "Close" link that deactivates it

<p id="webmention-count">
  <a href="#webmentions-replies" aria-label="Show replies">3 replies</a>,
  1 reposts, 12 likes, 2 links, 0 posts
</p>

<div id="webmentions-replies" class="webmentions-detail">
  <a href="#webmention-count" class="webmentions-detail__close" aria-label="Close replies">Close</a>
  {% webmention_replies page.url %}
</div>

_sass/_main.scss

• Hides .webmentions-detail by default; shows on :target — no JavaScript required
• Styles the close link as a block element

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