fix(comments): inline repliesOf() — {@const} placement

Svelte rejected `{@const replies = repliesOf(c.id)}` because it sat
inside `<li>` rather than directly under `{#each}`. The Gitea deploy
typecheck (`svelte-check --threshold error`) failed on this, leaving
the previous Cusdis bundle live. Inlining the call costs one extra
filter per render — fine here.

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

src/lib/components/Comments.svelte

@@ -296,10 +296,9 @@
             </form>
           {/if}
 
-          {@const replies = repliesOf(c.id)}
+          {#if repliesOf(c.id).length > 0}
-          {#if replies.length > 0}
             <ul class="mt-3 ml-4 space-y-3 list-none p-0">
-              {#each replies as r (r.id)}
+              {#each repliesOf(c.id) as r (r.id)}
                 <li class="border-l-2 border-zinc-100 pl-3">
                   <div class="flex items-baseline gap-2 text-sm">
                     <strong class="font-medium">{r.author}</strong>