style(comments): move count badge under image, drop underline

Repositions the CommentCountBadge out of the date row into its own
container below the post image. Removes hover colour-change + the
prose underline (`no-underline\!`) so the badge sits flat with the
post chrome.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/lib/components/CommentCountBadge.svelte

@@ -55,7 +55,7 @@
   href="#{targetId}"
   onclick={onClick}
   aria-label="Zu Kommentaren springen"
-  class="inline-flex items-center gap-1 text-sm text-zinc-600 hover:text-zinc-900 transition-colors {cls}"
+  class="no-underline! inline-flex items-center gap-1 text-xs font-medium transition-colors {cls}"
 >
   <Icon icon="mdi:comment-outline" class="size-4" />
   <span class="tabular-nums">{count ?? "…"}</span>